Journal articles: 'Square-planar PdII complexes'

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Miroslaw, Barbara, Beata Cristóvão, and Zbigniew Hnatejko. "Structural, Luminescent and Thermal Properties of Heteronuclear PdII–LnIII–PdII Complexes of Hexadentate N2O4 Schiff Base Ligand." Molecules 23, no. 10 (2018): 2423. http://dx.doi.org/10.3390/molecules23102423.

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New PdII–LnIII–PdII complexes of hexadentate N2O4 Schiff base ligand (H4L: N,N′-bis(2,3-dihydroxybenzylidene)-1,3-diamino-2,2-dimethylpropane) with Eu (1), Tb (2), Er (3) and Yb (4) ([Pd2Eu(H2L)2NO3](NO3)2∙2H2O∙2CH3OH 1, [Pd2Ln(H2L)2H2O](NO3)3∙3H2O, where Ln = Tb 2, Er 3, [Pd2Yb(H2L)2H2O](NO3)3∙5.5H2O 4) were synthesized and characterized structurally and physicochemically by thermogravimetry (TG), differential thermogravimetry (DTG), differential scanning calorimetry (DSC) and luminescence measurements. The compounds 1–4 are built of cationic heterometallic PdII–LnIII–PdII trinuclear units. The palladium(II) centers adopt a planar square geometry occupying the smaller N2O2 cavity of the Schiff base ligand. The lanthanide(III) is surrounded by two Schiff base ligands (eight oxygen atoms) and its coordination sphere is supplemented by a chelating bidentate nitrate ion in 1 or by a water molecule in 2–4. The complexes have a bent conformation along the PdII–LnIII–PdII line with valence angles in the ranges of 162–171°. The decomposition process of the complexes results in mixtures of: PdO, Pd and respective lanthanide oxides Eu2O3, Tb2O3, Tb4O7, Er2O3, Yb2O3. The luminescent measurements show low efficiency intramolecular energy transfer only in the complex of terbium(III) (2).

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Il'in, Mikhail V., Dmitrii S. Bolotin, Alexander S. Novikov, et al. "Square-planar aminonitronate transition metal complexes (M = CuII, NiII, PdII, and PtII)." Inorganica Chimica Acta 467 (October 2017): 372–78. http://dx.doi.org/10.1016/j.ica.2017.08.034.

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Aragay, Gemma, Josefina Pons, Vicenç Branchadell, et al. "Synthesis and Characterization of New N-Alkylamino-3,5-diphenylpyrazole Ligands and Reactivity Toward PdII and PtII. Study of the cis–trans Isomerization." Australian Journal of Chemistry 63, no. 2 (2010): 257. http://dx.doi.org/10.1071/ch09371.

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In this paper, the synthesis and characterization of two new N-alkylaminopyrazole ligands, 1-[2-(ethylamino)ethyl]-3,5-diphenylpyrazole (dpea) and 1-[2-(octylamino)ethyl]-3,5-diphenylpyrazole (dpoa) are reported. The reaction of these ligands with [MCl2(CH3CN)2] (M = PdII, PtII) affords the following square planar complexes: cis-[MCl2(NN′)] (M = PdII: NN′ = dpea, 1; dpoa, 2; M = PtII: NN′ = dpea, 3; dpoa, 4). Reaction of [PdCl2(CH3CN)2] and dpea or dpoa in 1:2 M:NN′ molar ratio, in the presence of NaBF4, yields complexes [Pd(NN′)2](BF4)2 (NN′ = dpea, [5](BF4)2); dpoa, [6](BF4)2). The solid-state structures of complexes 1, 3, and [5](BF4)2 have been determined by single-crystal X-ray diffraction methods. In complexes 1 and 3, the dpea ligand is coordinated through the Npz and Namino atoms to the metallic centre, which completes its coordination with two chlorine atoms in a cis disposition. For complex [5](BF4)2, the crystal structure consists of cations involving a [Pd(Npz)2(Namino)2]2+ core with a cis disposition of the two dpea ligands in a square-planar geometry and BF4 – anions. Theoretical calculations were carried out to optimize the geometries of the cis and trans isomers of the [Pd(dpea)2]2+ cation and of the [Pd(dpea)2](BF4)2 complex. The results show that the trans isomer is the most stable for [Pd(dpea)2]2+, in contrast with the cis stereochemistry observed in the crystal structure of [Pd(dpea)2](BF4)2. The calculations also predict that in acetonitrile solution, the dissociation of this complex into the corresponding ions is thermodynamically favourable. The cis–trans isomerization process of [Pd(dpea)2]2+ in acetonitrile solution has been studied by NMR spectroscopy at different temperatures. These experimental results confirm that the trans isomer is the thermodynamically most stable form of the complexes [5](BF4)2 and [6](BF4)2.

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Journal, Baghdad Science. "Preparation and Spectroscopic Studies of Some Metal Ion Complexes of 2-((4-Formyl-3-Hydroxynaphthalen-2-yl) Diazenyl) Benzoic Acid." Baghdad Science Journal 13, no. 2 (2016): 95–104. http://dx.doi.org/10.21123/bsj.13.2.95-104.

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New azo ligand 2-((4-formyl-3-hydroxynaphthalen-2-yl) diazenyl) benzoic acid (H2L) was synthesized from the reaction of 2-aminobenzoic acid and2-hydroxy-1-naphthaldehyde. Monomeric complexes of this ligand, of general formulae [MII(L)(H2O)] with (MII = Mn, Co, Ni, Cu, Zn, Pd, Cd and Hg ) were reported. The compounds were isolated and characterized in solid state by using 1H-NMR, FT-IR, UV–Vis and mass spectral studies, elemental microanalysis, metal content, magnetic moment measurements, molar conductance and chloride containing. These studies revealed tetrahedral geometries for all complexes except PdII complex is Square planar. The study of complexes formation via molar ratio of (M:L) as (1:1). Theoretical treatments of compounds in gas phase were studied using Hyper Chem-8 program has.

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B., H. Mehta, and A. Shaikh J. "Synthesis and structural characterization of Schiff base complexes of PdII, RhIII and RuIII." Journal of Indian Chemical Society Vol. 86, Jun 2009 (2009): 624–27. https://doi.org/10.5281/zenodo.5811801.

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Department of Chemistry, University of Mumbai, Vidyanagari, Santacruz (E), Mumbai-400 098, India E-mail: bipin _281050@yahoo.com Manuscript received 16 April 2008, revised 19 January 2009, accepted 12 February 2009 A bidentate ligand, 2-hydroxy-1-naphthalidene-4'-nitroanillne (HNNA) was synthesized from 2-hydroxy-1- naphthaldehyde and 4-nilroaniline. Its metal complexes of general formula M(HNNA)2 where M = Pdll and (M(HNNA)2X.H2O].2H2O where M = RhIII and RuIII and X = Cl have been prepared. All the complexes were characterized using various physico-chemical methods such as elemental analysis, thermal analysis and spectral (IR, electronic and NMR) analysis. The RhIII and RuIII complexes have octahedral structures while PdII complex has square planar geometry.

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K., Shanker, Rohini R., Shravankumar K., Muralidhar Reddy P., Ho Yen-Peng, and Ravinder V. "Synthesis of tetraaza macrocyclic PdII complexes; antibacterial and catalytic studies." Journal of Indian Chemical Society Vol. 86, Feb 2009 (2009): 153–61. https://doi.org/10.5281/zenodo.5807455.

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Department of Chemistry, Kakatiya University, Warangal-506 009, Andhra Prasesh, India E-mail: ravichemku@rediffmail.com Department of Chemistry, National Dong Hwa University, Hualien, Taiwan Manuscript received 25 January 2008, revised 11 September 2008, accepted 16 September 2008 A series of new Schiff base PdII complexes of the type [Pd(L)]x2 [where, L = HBOADO, TBACD, OBACD, HBOADT, DBACDT, TBAHD and X = Cl-] have been synthesized by non-template method. The complexes were characterized with the help of elemental analyses, conductance measurements, magnetic measurements, infrared, NMR ( 1H, 13C), mass, electronic spectral studies and thermal analysis. Based on the spectral data, square-planar geometry is tentatively proposed to all the complexes. The biological activities of these complexes have been tested in vitro to evaluate their activity against Gram -ve and Gram -ve bacteria and were found to be more active than streptomycin and ampicillin. [Pd(HBOADO)]CI2 and [Pd(OBACD)]CI2 complexes were studied on the catalytic reduction reactions of 2-nitroanlsole, 3-nitroanisole, 4-nitroanisole, 2-nitrohenzoicacid, 3-nitrobenzoicacld, 4-nitrobenzolcacid under mild conditions. The reduced products were treated with nitrous acid followed by β-naphthol and the developed colored products were determined spectrophotometrically. [Pd(HBOADO)]CI2 is found to be more efficient than [Pd(OBACD)]Cl2.

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Garau, Alessandra, Giacomo Picci, Massimiliano Arca, et al. "Can Serendipity Still Hold Any Surprises in the Coordination Chemistry of Mixed-Donor Macrocyclic ligands? The Case Study of Pyridine-Containing 12-Membered Macrocycles and Platinum Group Metal ions PdII, PtII, and RhIII." Molecules 26, no. 5 (2021): 1286. http://dx.doi.org/10.3390/molecules26051286.

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This study investigates the coordination chemistry of the tetradentate pyridine-containing 12-membered macrocycles L1-L3 towards Platinum Group metal ions PdII, PtII, and RhIII. The reactions between the chloride salts of these metal ions and the three ligands in MeCN/H2O or MeOH/H2O (1:1 v/v) are shown, and the isolated solid compounds are characterized, where possible, by mass spectroscopy and 1H- and 13C-NMR spectroscopic measurements. Structural characterization of the 1:1 metal-to-ligand complexes [Pd(L1)Cl]2[Pd2Cl6], [Pt(L1)Cl](BF4), [Rh(L1)Cl2](PF6), and [Rh(L3)Cl2](BF4)·MeCN shows the coordinated macrocyclic ligands adopting a folded conformation, and occupying four coordination sites of a distorted square-based pyramidal and octahedral coordination environment for the PdII/PtII, and RhIII complexes, respectively. The remaining coordination site(s) are occupied by chlorido ligands. The reaction of L3 with PtCl2 in MeCN/H2O gave by serendipity the complex [Pt(L3)(μ-1,3-MeCONH)PtCl(MeCN)](BF4)2·H2O, in which two metal centers are bridged by an amidate ligand at a Pt1-Pt2 distance of 2.5798(3) Å and feature one square-planar and one octahedral coordination environment. Density Functional Theory (DFT) calculations, which utilize the broken symmetry approach (DFT-BS), indicate a singlet d8-d8 PtII-PtII ground-state nature for this compound, rather than the alleged d9-d7 PtI-PtIII mixed-valence character reported for related dinuclear Pt-complexes.

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Sevillano, Paloma, Abraha Habtemariam, M. Inés García Seijo, et al. "Homonuclear PdII and PtII and heteronuclear PdII-AuI and PtII-AuI complexes of a tripod triphosphine ligand: synthesis, characterization and reactions with molecules of biological relevance." Australian Journal of Chemistry 53, no. 8 (2000): 635. http://dx.doi.org/10.1071/ch00028.

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Complexes of the type Pd(tripod)X2 [tripod = MeC(CH2PPh2)3; X = Cl (1), Br (2), I (3)] and Pt(tripod)X2 [X = Cl (4), Br (5), I (6)] have been synthesized. In these complexes tripod acts as a bidentate chelating ligand. The uncoordinated phosphorus atom can bind to AuI to form the bimetallic complexes PdAu(tripod)X3 [X = Cl (7), Br (8), I (9)] and PtAu(tripod)X3 [X = Cl (10), Br (11), I (12)]. Complexes (1)–(12) have been characterized by microanalysis, f.a.b. mass spectrometry, i.r. spectroscopy, 31P and 195Pt n.m.r. spectroscopies, and conductivity measurements. The structures of complexes (1), (4) and (11), as well as that of the unusual complex Cl2Pt(tripod)AuBr0.5Cl0.5 (13), isolated from reaction of Pt(tripod)Br2 (5), and [Au(thiodiglycol)Cl], have been determined. All complexes show square-planar geometry for PdII or PtII and linear geometry for AuI. The X-ray crystal structure of (1) showed partial oxidation of the dangling phosphorus of the ligand in 50% of the molecule distributed randomly over the lattice. Reactions of complex (4), Pt(tripod)Cl2, with the tripeptide glutathione (GSH) showed the formation of [Pt2(tripod)2(GS-µ–S)2]2+ (15a). No reaction with N-acetyl-L-methionine (AcMet) or guanosine 5´-monophosphate (5´-GMP) was observed. Reactions of [Pt(tripod–O)(ONO2)2] (14) with GSH resulted in the formation of [Pt2(tripod–O)2(GS-µ-S)2]2+ (15b). Displacement of the S-containing molecules by 5´-GMP in the presence of AuI, via Pt–S bond cleavage, was observed for complex (15b). PtAu(tripod)Cl3 (10) reacted with GSH, with initial attack on the AuI centre.

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Aragay, Gemma, Josefina Pons, Jordi García-Antón, et al. "Synthesis and Characterization of New Palladium(II) Complexes Containing N-Alkylamino-3,5-diphenylpyrazole Ligands. Crystal Structure of [PdCl(L2)](BF4) {L2 = Bis[2-(3,5-diphenyl-1-pyrazolyl)ethyl]ethylamine}." Australian Journal of Chemistry 62, no. 5 (2009): 475. http://dx.doi.org/10.1071/ch08521.

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In this paper, the synthesis of two new N,N′,N-ligands, bis[2-(3,5-diphenyl-1-pyrazolyl)ethyl]amine (L1) and bis[2-(3,5-diphenyl-1-pyrazolyl)ethyl]ethylamine (L2) is reported. These ligands form complexes with the formula [PdCl(N,N′,N)]Cl when reacting with [PdCl2(CH3CN)2] in a 1:1 metal-to-ligand molar ratio. Treatment of these ligands with [PdCl2(CH3CN)2] in a 1:1 metal-to-ligand molar ratio in the presence of AgBF4 or NaBF4 gave [PdCl(N,N′,N)](BF4) complexes. These PdII complexes were characterized by elemental analyses, conductivity measurements, mass spectrometry, and IR, 1H, and 13C{1H} NMR spectroscopies. The X-ray structure of the complex [PdCl(L2)](BF4) has been determined. The metal atom is coordinated by two azine nitrogen atoms and one amine nitrogen atom of the aminopyrazole ligand. The distorted square planar coordination is completed by one chlorine atom. In this complex, intermolecular π–π stacking interactions are present.

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R., K. Prasad, Bina Rani (Mrs.), and Singh Dhananjai. "Structural aspects of complexes of RhIII and PdII with hexamethylenedibiguanide (C10H24N10)." Journal of Indian Chemical Society Vol. 83, Jul 2006 (2006): 718–21. https://doi.org/10.5281/zenodo.5825154.

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Department of Chemistry, Science CoHege, Patna University, Patna-800 005, Bihar, India E-mail : rkpd6@yahoo.com Department of Chemistry, Magadh Mahila College, Patna University, Patna-800 001, Bihar, India Manuscript received 5 September 2005, revised 10 April 2006, accepted 10 April 2006 Complexes of RhIII and PdII with hexamethylenedibiguanide {hm(BigH+)2} of composition [Rh{hm(BigH+)2}X2]l.XH2O and [pd2{hm(BigH+)2}X4] (X= Cl-, Br-, r or NCSl; [Pd{hm(BigH+)2}.Cl2 and [Rh2{hm(BigH+)2}3].X6nH2O (X= OH- or 1/2 SO\(_4^{2-}\)- and {hm(BigH+)2} = C10H24N10} have been prepared and characterized from the studies of IR, UV, electrical conductance and magnetic susceptibility measurements. Both RhIII nd PdII complexes are diamagnetic suggesting low spin octahedral structure of RhIII and four coordinated square planar geometry of PdII.

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Sulekh, Chandra, Verma Shweta, and Meera P. "Synthesis and spectral studies of nitrogen-oxygen donor macrocyclic metal complexes of MnII, CuII, ZnII, PdII and PtII." Journal of Indian Chemical Society Vol. 85, Sep 2008 (2008): 896–900. https://doi.org/10.5281/zenodo.5819707.

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Department of Chemistry, Zakir Husain College (University of Delhi), JLN Marg, New Delhi- 11 0 002, India E-mail: schandra_00@yahoo.com; shweta_verma@rediffmail.com Fax: 91-11-23215906 Physical & Materials Chemistry, National Chemical Laboratory, Pune-41 1 008, Maharashtra, India Manuscript received 1 November 2007, revised 15 May 2008, accepted 25 June 2008 The complexes of Mnll, CuII, ZnII, Pdll and PtII with a nitrogen-oxygen donor macrocyclic ligand, viz. 5,6,13,14- dibenzo[1,4,8,11]dioxadiaza-5,7,11,13-cyclotetradecin have been synthesized and characterized by elemental analysis, molar conductance, magnetic susceptibility measurements, spectral and electrochemical studies. The molar conductance measurements of the complexes in DMF solution correspond to non electrolytic nature for M(L)X2 complexes and 1 : 2 electrolytes for M'(L)X2 complexes [where M = Mnll, CuII ; M' = ZnII, PdII and PtII ; X= Cl-, NO-3 and L = ligand]. Thus, the complexes may be formulated as [M(L)X2] and [M'(L)]X2 respectively. MnII, CuII complexes were of the high-spin type whereas the complexes of ZnII, PdII and PtII were diamagnetic. On the basis of spectral studies an octahedral geometry has been assigned for MnII , tetragonal for CuII , tetrahedral for ZnII complexes whereas square planar for PdII and PtII complexes.

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Butcher, Ray J., Puspendra Singh та Gulam Shabbani. "Dichlorido(4-methylaniline-κN)[N-(4-methylphenyl)-1-(thiophen-2-yl)methanimine-κN]palladium(II)". Acta Crystallographica Section E Crystallographic Communications 78, № 6 (2022): 1–0. http://dx.doi.org/10.1107/s2056989022004960.

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The structure of a mono-amine PdII complex, [PdCl2(C7H9N)(C12H11NS)], which crystallizes in the triclinic space group, P\overline{1}, is reported. The primary geometry around the PdII atom closely resembles square planar (τ4′ = 0.069). In the (E)-1-(thiophen-2-yl)-N-(p-tolyl)methanimine ligand, the phenyl and thiophene rings are not coplanar, subtending a dihedral angle of 38.5 (1)° because of steric effects. The PdCl2N2 coordination plane is almost perpendicular to the planes of the coordinated o-toluidine and the NC2 fragment [dihedral angles of 84.7 (1) and 72.50 (4)°, respectively]. The Pd—NH2 length of 2.040 (2) Å is slightly shorter than the observed mean value for other complexes involving a Pd atom attached to the nitrogen of an aniline derivative. The molecules display an interesting supramolecular synthon based on reciprocal intermolecular N–H...Cl hydrogen-bonding interactions of the p-toluidine amine fragment, which results in centrosymmetric dimeric units. These units are further linked by C—H...Cl interactions, resulting in chains in the c-axis direction where the mean-planes of the repeating fragment are oriented in the (110) plane.

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Kim, Sunghoon, Dongil Kim, Yujin Song, Ha-Jin Lee, and Hyosun Lee. "Synthesis and Structural Characterisation of Palladium(II) Complexes with N,N′,N-Tridentate N′-Substituted N,N-Di(2-picolyl)amines and their Application to Methyl Methacrylate Polymerisation." Australian Journal of Chemistry 67, no. 6 (2014): 953. http://dx.doi.org/10.1071/ch13731.

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The reaction of [Pd(CH3CN)2Cl2] with N′-substituted N,N-di(2-picolyl)amine-based ancillary ligands, for example N,N-di(2-picolyl)cyclohexylmethylamine (L1), N,N-di(2-picolyl)benzylamine (L2), N,N-di(2-picolyl)aniline (L3), and 1,4-bis[bis(2-pyridylmethyl)aminomethyl]benzene (L4), in the presence of NaClO4 in ethanol yields a new series of [(NN′N)PdCl]X (X = ClO4, Cl) complexes, i.e. mononuclear [LnPdCl]ClO4 (Ln = L1, L2, L3) and binuclear [L4Pd2Cl2]Cl2. X-Ray crystallographic analysis determined that the Pd atom in complexes [(NN′N)PdCl]X showed a slightly distorted square-planar geometry involving three nitrogen atoms and a chlorido ligand. Moreover, the unit cell included a ClO4– or Cl– anion as the counterion. The complex [L1PdCl]ClO4 showed the highest catalytic activity for the polymerisation of methyl methacrylate in the presence of modified methylaluminoxane at 60°C among the mononuclear PdII complexes. Specifically, the activity of binuclear [L4Pd2Cl2]Cl2 was 2-fold higher than the corresponding mononuclear [L2PdCl]ClO4 per active palladium metal centre.

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Singh, R. V., S. C. Joshi, Shalini Kulshrestha, Pooja Nagpal, and Anil Bansal. "Antiandrogen and Antimicrobial Aspects of Coordination Compounds of Palladium(II), Platinum(II) and Lead(II)." Metal-Based Drugs 8, no. 3 (2001): 149–58. http://dx.doi.org/10.1155/mbd.2001.149.

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Synthesis, characterization and antimicrobial activities of an interesting class of biologically potent macrocyclic complexes have been carried out. All the complexes have been evaluated for their antimicrobial effects on different species of pathogenic fungi and bacteria. The testicular sperm density, testicular sperm morphology, sperm motility, density of cauda epididymal spermatozoa and fertility in mating trails and biochemical parameters of reproductive organs have been examined and discussed. The resulting biologically active [M(MaLn)(R2)]Cl2 and [Pb(MaLn)(R2)X2] (where, M = PdII or PtII and X = Cl or NO3) type of complexes have been synthesized by the reactions of macrocyclic ligands (MaLn) with metal salts and different diamines in 1:1:1 molar ratio in methanol. Initially the complexes were characterized by elemental analyses, molecular weight determinations and conductivity measurements. The mode of bonding was established on the basis of IR, H1 NMR, C13 NMR, Pt195 NMR, Pb207 NMR, XRD and electronic spectral studies. The macrocyclic ligand coordinates through the four azomethine nitrogen atoms which are bridged by benzil moieties. IR spectra suggest that the pyridine nitrogen is not coordinating. The palladium and platinum complexes exhibit tetracoordinated square-planar geometry, whereas a hexacoordinated octahedral geometry is suggested for lead complexes.

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Dyakonenko, Viktoriya V., Alexandra N. Kozachkova, Natalia V. Tsaryk, Vasily I. Pekhnyo та Ruslan V. Lavryk. "(μ-Methylenediphosphonato-κ4 O,O′:O′′,O′′′)bis[(ethylenediamine-κ2 N,N′)palladium(II)] tetrahydrate". Acta Crystallographica Section E Crystallographic Communications 74, № 12 (2018): 1838–41. http://dx.doi.org/10.1107/s2056989018016419.

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The title compound, [Pd2(C2H8N2)2(CH2O6P2)]·4H2O, comprises of a binuclear molecule (point group symmetry 2), with a twofold rotation axis running through the central C atom of the methylenediphosphonate (MDP) anion. The PdII atom has a square-planar coordination environment defined by the N atoms of a bidentate ethylenediamine (en) ligand and two O atoms of the bridging MDP anion. In the crystal structure, metal complexes are arranged in layers parallel (001) and are sandwiched between layers containing disordered water molecules of crystallization. Extensive intralayer hydrogen bonds of the type N—H...O in the metal complex layer and O—H...O in the water layer, as well as O—H...O hydrogen bonds between the two types of layers, lead to the formation a three-dimensional network structure. The two lattice water molecules are each equally disordered over two positions.

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Durgadas, Mukherjee, and Nath Das Soumendra. "Design, synthesis and spectral characterization of chelates of PdII , PtII and RhIII with 6-guanidino-2,4-dimethyl-3,5-diazine and 6-phenyl guanidino-2,4-dimethyl3,5-diazine-potentialligands with biological interest." Journal of Indian Chemical Society Vol. 85, Jan 2008 (2008): 148–52. https://doi.org/10.5281/zenodo.5808696.

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Department of Chemistry, Mahadevananda Mahavidyalaya, Monirampur, Barrackpore, Kolkata-700 120, India E-mail: durgadas.mukherjee@gmail.com Manuscript received 18 July 2007, revised 7 November 2007, accepted 19 November 2007 Complexes of 6-guanidino-2,4-dimethyl-3,5-diazine and 6-phenyl guanidino-2,4-dimethyl-3,5-diazine with PdII, PtII and RhIII have been reported. Complexes have been characterised on the basis of analytical, magnetic and spectral characterization and powder diffraction studies. Crystal field parameters have also been calculated. The PdII and PtII complexes are square planar as expected and RhIII complexes are pseudo-octahedral. IR data indicate that the imino nitrogen of the guanidine residue and one of the pyrimidyl nitrogen atoms acts as bonding sites in the formation of these complexes.

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Han, Jianlin, José Luis Aceña, Nobuhiro Yasuda, et al. "Carbonyl group coordination preferences in square-planar NiII and PdII complexes of pentadentate ligands by electron-withdrawing/donating substituents." Inorganica Chimica Acta 433 (July 2015): 3–12. http://dx.doi.org/10.1016/j.ica.2015.04.029.

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B., H. Mehta, A. Pawanoji A., and A. Shaikh J. "Spectral and magnetic studies of cobalt(II), nickel(II) and palladium(II) metal with bidentate Schiff base ligands." Journal of Indian Chemical Society Vol. 87, Jul 2010 (2010): 779–84. https://doi.org/10.5281/zenodo.5792516.

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Department of Chemistry, University of Mumbai, Vidyanagari, Kalina, Santacruz (E), Mumbai-400 098, India E-mail : bipin_281050@yahoo.com Manuscript received 26 June 2009, revised 7 October 2009, accepted 2 February 2010 The divalent metal complexes of cobalt, nickel and palladium have been prepared with bidentate Schiff bases derived by condensing 3-hydroxybenzaldehyde and 5-chlorosalicyladehyde with 4-hydroxybenzhydrazide. The complexes obtained were characterized on the basis of their elemental analysis, magnetic moment, conductance, IR, electronic, 1H NMR as well as thermal analysis. The cobalt and nickel complexes are paramagnetic exhibiting tetrahedral geometry whereas palladium complexes are diamagnetic showing square planar geometry. Their spectral data revealed that both the Schiff bases behave as bidentate ligands and are coordinated to CoII, NiII and PdII via azomethine nitrogen and phenolic oxygen. X-Ray powder diffraction studies suggest orthorhombic crystal system for all the metal complexes.

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El-Ghamry, Hoda A., Mohamed Gaber, and Thoraya A. Farghaly. "Synthesis, Structural Characterization, Molecular Modeling and DNA Binding Ability of CoII, NiII, CuII, ZnII, PdII and CdII Complexes of Benzocycloheptenone Thiosemicarbazone Ligand." Mini-Reviews in Medicinal Chemistry 19, no. 13 (2019): 1068–79. http://dx.doi.org/10.2174/1389557519666190301143322.

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Background & Objective: Six novel complexes of transition metal namely, [CoLCl2(H2O)2]0.5H2O, [NiLCl2(H2O)2]0.5H2O, [CuLCl2]0.5H2O, [ZnLCl2], [PdLCl2]H2O and [CdLCl2]H2O, where L is benzocycloheptenone thiosemicarbazone ligand, have been obtained. The confirmation of the structures of the obtained metal chelates depends on the different spectral and physicochemical techniques including CHN analysis, infrared spectra, molar conductivity measurement, UV-vis, thermogravimetric analysis and magnetic moment. The infrared spectral results ascertained that the ligand behaved as neutral bidentate connecting the metal centers via N and S atoms of C=N and C=S groups, respectively. Methods: The UV-Vis, molar conductivity and magnetic susceptibility results implied that the geometrical structures of the metal chelates are octahedral for Co(II) & Ni(II) complexes, tetrahedral for Zn(II) & Cd(II) complexes and square planar for Cu(II) & Pd(II) complexes which have been confirmed by molecular modeling studies. Conclusion: Moreover, the mode of interaction between some chosen metal complexes towards SSDNA has been thoughtful by UV-Vis spectra and viscosity measurements. The value of the intrinsic binding constant (Kb) for the examined compounds has been found to be lower than the binding affinity of the classical intercalator ethedium bromide. Also, the viscosity measurements of the complexes proved that they bind to DNA, most likely, by a non-intercalative mode like H-bonding or electrostatic interactions.

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Abraham, Joseph, and Narayana B. "Synthesis and characterization of AgI, TII, znII, CdII, CdII, HgII, PdII,CoII and NiII complexes with 4-salicylideneamino-3-mercapto-6-t-butyl-1,2,4- triazin( 4H)-5-one." Journal of Indian Chemical Society Vol. 84, Aug 2007 (2007): 746–49. https://doi.org/10.5281/zenodo.5824650.

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Department of Chemistry, University of Cali cut, Calicut-673 635, Kerala, India E-mail : drabrahamj@ gmail.com Department of Studies in Chemistry, Mangalore University, Mangalagangothri-574 199, Karnataka, India E-mail: nbadiadka@gmail.com Manuscript received 8 February 2007, revised 14 May 2007, accepted 11 June 2007 The complexes of AgI, TlI, znII, Pdll, Cdll, HgII, CoII and NiII with 4-salicylideneamino-3-mercapto-6-t-butyl-1,2,4-triazin(4H)- 5-one (SMBT) have been synthesized and characterized on the basis of elemental analysis, spectral studies, magnetic susceptibility studies,conductance studies and thermal studies. Octahedral structures have been proposed for the CoII and NiII complexes, square-planar for the PdII complex, tetrahedral for the HgII, znII and CdII complexes and linear polymeric structures for the TlI and AgI complexes. The ligand coordinates to the metal ions through thiol sulfur after deprotonation and with azomethine nitrogen. Phenolic oxygen of the ligand is also involved in bonding after deprotonation in few of the complexes.

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Kokatam, Swarna-Latha, Phalguni Chaudhuri, Thomas Weyhermüller, and Karl Wieghardt. "Molecular and electronic structure of square planar complexes [PdII(tbpy)(LIPN,O)]0, [PdII(tbpy)(LISQN,O)](PF6), and [PdII(tbpy)(LIBQN,O)](PF6)(BF4)·2CH2Cl2: an o-iminophenolato based ligand centered, three-membered redox series." Dalton Trans., no. 3 (2007): 373–78. http://dx.doi.org/10.1039/b614745c.

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Abraham, Joseph, Joseph Bincy, and Narayana B. "Complexes of AgI, TlI, ZnII, CdII, HgII , CoII, NiII , RuII , PdII , RuIII , RhIII and PtIV with 4-(pyridine-2-carboxylidineamino )-5-mercapto-1 ,2 ,4-triazole." Journal of Indian Chemical Society Vol. 85, May 2008 (2008): 479–84. https://doi.org/10.5281/zenodo.5816390.

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Department of Chemistry, University of Calicut, Calicut University-673 635, Kerala, India E-mail : drabrahamj@gmail.com Department of Studies in Chemistry, Mangalore University, Mangalagangothri-574 199, Karnataka, India E-mail : nbadiadka@gmail.com Manuscript received 7 August 2007, revised 29 October 2007, accepted 12 February 2008 The synthesis and characterization of complexes of AgI, TlI, ZnII, CdII , HgII , CoII, NiII , PdII , RuII, RuIII, RhIII and PtIV with 4-(pyridine-2-carboxylidineamino)-5-mercapto-1,2,4-triazole (PMT) have been carried out on the basis of chemical and physical methods like elemental analysis, infrared, 1H NMR and electronic spectral studies, magnetic susceptibility measurements, conductance and thermal studies. Octahedral structures have been proposed for the CoII , NiII , RuII, RuIII , RhIII and PtIV complexes, square-planar for the PdII complex, tetrahedral for the ZnII , CdII and HgII complexes and linear polymeric structures for the AgI and TII complexes. The ligand coordinates to the metal ions through thiol sulfur after deprotonation and with nitrogen of the azomethine group. Pyridine nitrogen of PMT is also involved in coordination in PdII , RuIII , RhIII and PtIV complexes.

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Mouas Toma, Nardjes, Jean-Claude Daran, Hocine Merazig, and Eric Manoury. "A new P,S-coordinating ferrocenyl ligand: synthesis of a precursor and its coordination compounds with PdII and PtII." Acta Crystallographica Section C Structural Chemistry 70, no. 5 (2014): 460–64. http://dx.doi.org/10.1107/s2053229614007554.

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In our ongoing development of ferrocene ligands, 1-dimethylamino-2-(diphenylphosphinothioyl)ferrocene is being used as a convenient building block to obtain racemic or enantiomerically pure ligands. Using this building block in large excess allowed the formation of several by-products, two of which have already been reported; the structure of a third by-product, namely 1-(diphenylphosphinothioyl)-2-{[(diphenylphosphinothioyl)sulfanyl]methyl}ferrocene, [Fe(C5H5)(C30H25P2S3)], is presented here. The crystal structure is built up from a ferrocene unit, with one of the cyclopentadienyl (Cp) rings substituted in the 1- and 2-positions by a protected diphenylphosphinothioyl group and a [(diphenylphosphinothioyl)sulfanyl]methyl fragment, –CH2SP(=S)Ph2. There are C—H...S interactions which result in the formation of chains parallel to the c axis. After desulfurization, the crude material was then reacted with Pd and Pt (M) precursors [MCl2(CH3CN)2] to yield two isostructural dinuclear complexes arranged around twofold axes, namely (R,R/S,S)-bis{μ-[2-(diphenylphosphanyl)ferrocen-1-yl]methanethiolato-κ3 P,S:S}bis[chloridopalladium(II)] pentane disolvate, [Pd2{Fe(C5H5)(C18H15PS)}2Cl2]·2C5H12, and the platinum(II) analogue, (R,R/S,S)-bis{μ-[2-(diphenylphosphanyl)ferrocen-1-yl]methanethiolato-κ3 P,S:S}bis[chloridoplatinum(II)] toluene monosolvate, [Pt2{Fe(C5H5)(C18H15PS)}2Cl2]·C7H8, in which the two metal atoms present a slightly distorted square-planar geometry formed by two bridging S atoms and P and Cl atoms. The P,S-chelating ligand results from the rupture of one of the P—S bonds in the starting ligand. These dinuclear complexes display a butterfly geometry. Surprisingly, only the (R,R/S,S) diastereoisomer has been isolated.

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Mostafa, Sahar I., Spyros P. Perlepes та Nick Hadjiliadis. "New Dinuclear Transition Metal Complexes with the [M2(μ-dhbq)]n+ Core and 2-(2′-Pyridyl)quinoxaline (L) as a Terminal Ligand: Preparation and Characterization (dhbq2-= the Dianion of 2,5-Dihydroxy -1,4- benzoquinone; M = AgI, MnII, CoII, NiII, CuII, RuII, PdII, FeIII, RhIII; n = 0, 2, 4)". Zeitschrift für Naturforschung B 56, № 4-5 (2001): 394–402. http://dx.doi.org/10.1515/znb-2001-4-512.

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Abstract Synthetic procedures are described that allow access to the new complexes [Mn2(dhbq)L2(H2O)4 (1), [Fe2(dhbq)L2(H2O)4](NO3)4 · 6H2O (2), [Co2(dhbq)Cl2L2(H2O)2] (3), [Ni2(dhbq)Cl2L2(H2O)2] (4), [Cu2(dhbq)Cl2L2(H2O)2] (5), [Ru2(dhbq)L2(H2O)4](ClO4)2 (6), [Rh2(dhbq)Cl2L2(H2O)2]Cl2·2H2O (7), [Pd2(dhbq)L2]Cl2·5H2O (8) and [Ag2(dhbq)L2] (9), where dhbq2- is the dianion of 2,5-dihydroxy-1,4-benzoquinone and L is the biheteroaromatic ligand 2-(2′-pyridyl)quinoxaline. The new complexes were characterized by elemental analyses and by a variety of physical and spectroscopic techniques. Dinuclear structures are assigned for the complexes in the solid state. The two metal ions are bridged by the bischelating dhbq2- ion, while L behaves as a bidentate chelate with the 2′-pyridyl nitrogen and the nearest quinoxaline nitrogen atom as the ligand atoms. The metal ion coordination geometries are octahedral, tetrahedral or square planar.

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Román, Pascual, Javier I. Beitia, and Antonio Luque. "Preparation, chemical characterization and thermal study of 2-aminopyridinium salts of square-planar 1,2-dithiooxalato-S,S′ metal complexes (M  NiII, PdII and PtII)." Polyhedron 14, no. 20-21 (1995): 2925–31. http://dx.doi.org/10.1016/0277-5387(95)00169-s.

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Zawartka, W., A. Gniewek, A. M. Trzeciak, J. J. Ziółkowski, and J. Pernak. "PdII square planar complexes of the type [IL]2[PdX4] as catalyst precursors for the Suzuki–Miyaura cross-coupling reaction. The first in situ ESI-MS evidence of [(IL)xPd3] clusters formation." Journal of Molecular Catalysis A: Chemical 304, no. 1-2 (2009): 8–15. http://dx.doi.org/10.1016/j.molcata.2009.01.011.

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Akram, Ali, Sengupta Arunava, and Mukherjee Rabindranath. "Palladium(II) complexes of a redox-active o-aminophenolate-based ONSN ligand. Proof-of-concept of hemilability in reactivity with PPh3 providing ONNP and ONSP coordination." Journal of Indian Chemical Society Vol. 92, Dec 2015 (2015): 1981–91. https://doi.org/10.5281/zenodo.5602466.

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Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208 016, Uttar Pradesh, India and Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur-741 246, West Bengal, India E-mail : rnm@iitk.ac.in, rnm@iiserkol.ac.in Using a potentially tetradentate redox-active o-aminophenol-based ligand, H2L = 2-(2-ethylthio)pyridine-anilino4,6-di-tert-butylphenol, we recently reported synthesis and structural characterization of three O,N,S,N-coordinated squareplanar PdII complexes, green [PdII{(LAP) 2–}] 1 (S = 0), red [PdII{(LISQ) •–}][PF6 ]·CH2Cl2 2 (S = 1/2), and dark green [PdII{(LIBQ) 0}][BF4 ]2 ·2CH2Cl2 3 (S = 0), where the coordinated ligand is present as dianionic (LAP) 2–, monoanionic oiminobenzosemiquinonate(1–) π-radical (Srad = 1/2) (LISQ) • – , and neutral o-iminobenzoquinone (LIBQ) 0 redox level. Reaction of complexes 1 and 2 with PPh3 afforded isolation of two crystalline complexes, dark green [PdII{(LAp) 2–}(PPh3 )] 4 and red [PdII{(LISQ) •–}(PPh3 )][PF6 ]·CH2Cl2 5. X-Ray structure determination of complex 5 at 100(2) K revealed PdIION2P coordination environment (A. Ali, S. K. Barman and R. Mukherjee, Inorg. Chem., 2015, 54, 5182–5194). The present work reports X-ray structure determination of complex 4, which revealed PdIIONSP coordination environment. Notably, the ethylpyridine arm remains non-coordinated. When examined by cyclic voltammetry (CV), complex 4 exhibits two quasireversible oxidative responses at E1/2 = 0.08 (peak-to-peak separation, ΔEp = 140 mV) and 0.65 V (ΔEp = 150 mV) vs SCE (saturated calomel electrode). Both the redox processes are supposedly ligand-based. Absorption spectral property of complex 4 has also been investigated. Density Functional Theory (DFT) calculations at B3LYPlevel of theory adequately describe the electronic structure of complex 4, containing a spin-paired d8 PdII ion. TimeDependent (TD)-DFT calculation shed light on the origin of observed spectral absorptions for complex 4.

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Skabitskii, I. V., Yu Ya Il’ina, and S. S. Shapovalov. "Rhenium(V) Tris(pyrazolyl)borate Complexes as Ligands in Square Planar Palladium and Platinum Complexes." Координационная химия 49, no. 1 (2023): 36–43. http://dx.doi.org/10.31857/s0132344x22700086.

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The reactions of TpReO(SnC3H7)2 (Tp = tris(pyrazolyl)borate anion) with acetonitrile complexes PdCl2(MeCN)2 and PtI2(MeCN)2 in toluene solutions resulted in the formation of new heterometallic rhenium complexes TpReO(µ-SnC3H7)2MX2 (MX2 = PdCl2 (I), MX2 = PtI2 (II)). A similar complex TpReO(µ-SnC3H7)2PdI2 (III) was formed either on treatment of I with NaI in dichloromethane or in the reaction of TpReO(SnC3H7)2 with a suspension of PdI2 in toluene. Complexes I–III were characterized by IR and NMR spectroscopy and by X-ray diffraction (CCDC nos. 2172225–2172227).

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Hursthouse, Michael B., David G. Kelly, Mark E. Light, and Andrew J. Toner. "CP/MAS NMR and X-ray crystallographic characterization of trans-PdX2(PPh2vinyl)2 (X = Cl, I); UV and Et2O·BF3 reaction studies, including the formation of [Pd(µ-Cl)(PPh2vinyl)2]2[BF4]2." Canadian Journal of Chemistry 78, no. 8 (2000): 1073–80. http://dx.doi.org/10.1139/v00-101.

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The complexes PdCl2(PPh2vinyl)2 and PdI2(PPh2vinyl)2 have been prepared and crystallographically characterized as their trans square planar isomers. Trans-PdCl2(PPh2vinyl)2 exists in a centrosymmetric structure with a planar PdCl2P2 core whereas trans-PdI2(PPh2vinyl)2 shows no local Pd-centred symmetry and significant distortion of the PdI2P2 core from planarity. Crystallographic data is in accord with the 31P{1H} CP/MAS NMR spectra of the two complexes, which display a single resonance for the chloro-complex and two resonances for the iodo-complex. UV irradiation of CH2Cl2 solutions of PdCl2(PPh2vinyl)2 followed by re-dissolution in CDCl3 indicates no permanent chemical change. However, post-irradiation CP/MAS 31P{1H} NMR spectroscopy demonstrates the presence of trans-PdCl2(PPh2vinyl)2 in two solid state structures, plus cis-PdCl2(PPh2vinyl)2. PdI2(PPh2vinyl)2 exists only in its trans form in both solid state and solution. Irradiation results in phosphine displacement and the formation of sym-[PdI2(PPh2vinyl)]2 and free phosphine, the latter being characterized as Ph2P(O)vinyl following aerobic oxidation. PdCl2(PPh2vinyl)2 reacts in the presence of Et2O·BF3 to afford [Pd(µ-Cl)(PPh2vinyl)2]2[BF4]2 whereas PdI2(PPh2vinyl)2 is recovered in 95% yield, with the remaining material undergoing phosphine abstraction to form sym-[PdI2(PPh2vinyl)]2.Key words: palladium, phosphine, alkene, isomerization, CP/MAS.

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Melo, Ana Paula Lopes de, Bianca Barreto Martins, Leandro Bresolin, Bárbara Tirloni та Adriano Bof de Oliveira. "Synthesis, crystal structure and Hirshfeld analysis of trans-bis{(2E)-N-phenyl-2-[(2E)-3-phenyl-2-propen-1-ylidene]hydrazinecarbothioamidato-κ² N ¹,S}palladium(II)". Acta Crystallographica Section E Crystallographic Communications 79, № 11 (2023). http://dx.doi.org/10.1107/s2056989023008654.

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The reaction of (2E)-N-phenyl-2-[(2E)-3-phenyl-2-propen-1-ylidene]hydrazinecarbothioamide (common name: cinnamaldehyde-4-phenylthiosemicarbazone) deprotonated with NaOH in ethanol with an ethanolic suspension of PdII chloride in a 2:1 molar ratio yielded the title compound, [Pd(C16H14N3S)2]. The anionic ligands act as metal chelators, κ2 N 1 S-donors, forming five-membered rings with a trans-configuration. The PdII ion is fourfold coordinated in a slightly distorted square-planar geometry. For each ligand, one H...S and one H...N intramolecular interactions are observed, with S(5) and S(6) graph-set motifs. Concerning the H...S interactions, the coordination sphere resembles a hydrogen-bonded macrocyclic environment-type. In the crystal, the complexes are linked via pairs of H...S interactions, with graph-set motif R 2 2(8), and building a mono-periodic hydrogen-bonded ribbon along [001]. The Hirshfeld surface analysis indicates that the major contributions for the crystal cohesion are: H...H (45.3%), H...C/C...H (28.0%), H...S/S...H (8.0%) and H...N/N...H (7.4%).

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Abu‐Dief, Ahmed M., Omran A. Omran, Mehran Feizi‐Dehnayebi, et al. "Fabrication, structural elucidation, and DFT calculation of some new hydrophilic metal chelates based on N N′‐(1‐methyl‐2‐oxoindolin‐3‐ylidene)benzohydrazide ligand: Pharmaceutical studies and molecular docking approach." Applied Organometallic Chemistry, June 23, 2024. http://dx.doi.org/10.1002/aoc.7593.

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Some novel FeIII, CuII, and PdII chelates incorporating N′‐(1‐methyl‐2‐oxoindolin‐3‐ylidene)benzohydrazide (MIBA) were fabricated. The tested compounds were investigated using thermogravimetric analysis (TGA), CHN, spectra analysis (IR, mass spectra, and NMR), melting point, magnetic moments, molar conductance, ultraviolet–visible spectroscopy, powder X‐ray diffraction, and computational studies. The conductance results showed that the tested FeIII, CuII, and PdII chelates are electrolytes. Magnetic and electronic spectra are applied to deduce the coordinating ability of the tested ligand, and the geometric structure of the studied chelates is found to be octahedral, distorted octahedral, and square planar for FeIII, CuII, and PdII chelates, respectively. The TGA study of these studied complexes displays that the hydrated H2O molecules, acetate, and nitrate are removed in the first and second degradation steps followed directly by degradation of the studied ligand leaving metal oxide as residue. The thermodynamic factors, like ΔS*, ΔH*, E*, A, and ΔG* are evaluated from the TGA curves and explained. The density functional theory (DFT)/B3LYP computation method was applied for the estimation of the molecular electrostatic potential (MEP; highest occupied molecular orbital [HOMO] and lowest unoccupied molecular orbital [LUMO]) energy for the studied compounds. In an in vitro study, the antimicrobial effects of the prepared compounds were screened on various strains of bacteria and fungi. It was found that tested compounds exposed a good biological efficacy through IC50 results close to reference drugs and antitumor potential against (MCF‐7, Hep‐G2, and HC‐T116) cell lines. The data obtained displayed that the studied chelates showed promising antitumor activity. The studied metal chelates were screened for in vitro antioxidant efficacy using DPPH assay. The studied compounds explained dynamic satisfying performance. Also, the crystal structures of breast cancer protein (PDB ID: 3HB5) and Escherichia coli (PDB ID: 2VF5) were performed by molecular docking simulation. Data of docking simulation suggestions are which tested compounds have biological behavior as well as have obvious benefit in the pharmaceutical business.

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Melo, Ana Paula Lopes de, Leandro Bresolin, Bárbara Tirloni, Renan Lira de Farias та Adriano Bof de Oliveira. "Synthesis, crystal structure and Hirshfeld analysis of trans-bis(2-{1-[(6R,S)-3,5,5,6,8,8-hexamethyl-5,6,7,8-tetrahydronaphthalen-2-yl]ethylidene}-N-methylhydrazinecarbothioamidato-κ² N ²,S)palladium(II) ethanol monosolvate". Acta Crystallographica Section E Crystallographic Communications 79, № 12 (2023). http://dx.doi.org/10.1107/s2056989023009908.

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The reaction between the (R,S)-fixolide 4-methylthiosemicarbazone and PdII chloride yielded the title compound, [Pd(C20H30N3S)2]·C2H6O {common name: trans-bis[(R,S)-fixolide 4-methylthiosemicarbazonato-κ2 N 2 S]palladium(II) ethanol monosolvate}. The asymmetric unit of the title compound consists of one bis-thiosemicarbazonato PdII complex and one ethanol solvent molecule. The thiosemicarbazononato ligands act as metal chelators with a trans configuration in a distorted square-planar geometry. A C—H...S intramolecular interaction, with graph-set motif S(6), is observed and the coordination sphere resembles a hydrogen-bonded macrocyclic environment. Additionally, one C—H...Pd anagostic interaction can be suggested. Each ligand is disordered over the aliphatic ring, which adopts a half-chair conformation, and two methyl groups [s.o.f. = 0.624 (2):0.376 (2)]. The disorder includes the chiral carbon atoms and, remarkably, one ligand has the (R)-isomer with the highest s.o.f. value atoms, while the other one shows the opposite, the atoms with the highest s.o.f. value are associated with the (S)-isomer. The N—N—C(=S)—N fragments of the ligands are approximately planar, with the maximum deviations from the mean plane through the selected atoms being 0.0567 (1) and −0.0307 (8) Å (r.m.s.d. = 0.0403 and 0.0269 Å) and the dihedral angle with the respective aromatic rings amount to 46.68 (5) and 50.66 (4)°. In the crystal, the complexes are linked via pairs of N—H...S interactions, with graph-set motif R 2 2(8), into centrosymmetric dimers. The dimers are further connected by centrosymmetric pairs of ethanol molecules, building mono-periodic hydrogen-bonded ribbons along [011]. The Hirshfeld surface analysis indicates that the major contributions for the crystal cohesion are [atoms with highest/lowest s.o.f.s considered separately]: H...H (81.6/82.0%), H...C/C...H (6.5/6.4%), H...N/N...H (5.2/5.0%) and H...S/S...H (5.0/4.9%).

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Upmann, Daniel, and Peter G. Jones. "Crystal structures of six complexes of phosphane chalcogenides R ¹ R ² R ³PE (R = tert-butyl or isopropyl, E = S or Se) with the metal halides MX ₂ (M = Pd or Pt, X = Cl or Br), two halochalcogenylphosphonium derivatives (^tBu₂ ⁱPrPEBr)₂[Pd₂Br₆] and one hydrolysis product." Acta Crystallographica Section E Crystallographic Communications 81, no. 3 (2025). https://doi.org/10.1107/s2056989025000805.

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The L 2 MX 2 complexes 1–5 (1: L = t BuiPr2PSe, M = Pd, X = Cl; 2: L = t Bu2 iPrPSe, M = Pd, X = Cl; 3: L = t Bu2 iPrPSe, M = Pd, X = Br; 4: L = t Bu2 iPrPS, M = Pd, X = Br; 5: L = t Bu2 iPrPS, M = Pt, X = Cl) {systematic names: (tert-butyldiisopropylphosphine selenide-κSe)dichloridopalladium(II), [PdCl2(C10H23PSe)2] (1), (di-tert-butylisopropylphosphine selenide-κSe)dichloridopalladium(II), [PdCl2(C11H25PSe)2] (2), dibromido(di-tert-butylisopropylphosphine selenide-κSe)palladium(II), [PdBr2(C11H25PSe)2] (3), dibromido(di-tert-butylisopropylphosphine sulfide-κS)palladium(II), [PdBr2(C11H25PS)2] (4), dichlorido(di-tert-butylisopropylphosphine sulfide-κS)palladium(II), [PdCl2(C11H25PS)2] (5)} all display a trans configuration with square-planar geometry at the metal atom. Compounds 2 and 3 are isotypic. The molecules of 1 and 4 display crystallographic inversion symmetry; compound 5 involves two independent molecules, each with inversion symmetry but with differing orientations of the trialkylphosphane groups. Chemically equivalent bond lengths all lie in narrow ranges, whereby the values for palladium and platinum compounds scarcely differ. Compound 6, ( t BuiPr2PS)2Pd2Cl4 {systematic name: di-μ-chlorido-bis[(tert-butyldiisopropylphosphine sulfide-κS)chloridopalladium(II)], [PdCl2(C10H23PS)2]}, is dinuclear with a central Pd2Cl2 ring, and displays crystallographic inversion symmetry. The bonds to the bridging are longer than those to the terminal chlorine atoms; the Pd—S bond is shorter than the M—S bonds in 4 and 5, reflecting the weaker trans influence of (bridging) chlorine compared to sulfur. Compounds 7 and 8, 2( t Bu2 iPrPEBr)+ [Pd2Br6]2− with E = S for 7 and Se for 8 {systematic names: (bromosulfanyl)di-tert-butylisopropylphosphanium di-μ-bromido-bis[dibromidopalladium(II)], (C11H25BrPS)2[Pd2Br6] (7) and (bromoselanyl)di-tert-butylisopropylphosphanium di-μ-bromido-bis[dibromidopalladium(II)], (C11H25BrPS2)2[Pd2Br6], (8)}, were obtained by oxidizing the appropriate PdII precursors with elemental bromine; they are not isotypic. The ions are connected by very short halogen bonds Br...Br. For both compounds, two E...Br contacts further link the cations and anions to form ribbons. Compound 9 {systematic name: bis[dimethyl(sulfanylidene)phosphinito-κSe]bis(hydroxydiisopropylphosphine selenide-κSe)palladium(II), [Pd(C6H14OP)2(C6H15OP)2], {(iPr2PSeO)2H}2Pd, is a hydrolysis product with inversion symmetry and contains an intramolecular P—O...H—O—P group with a disordered hydrogen atom. Compounds 1–6 and 9 show few, if any, short intermolecular contacts, although some H...M contacts are observed. A problem with atom-type assignment for structure refinement is discussed.

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Pokharel, Uttam, Aaron Naquin, and Frank Fronczek. "Synthesis and crystal structure of a Pd^II complex of ortho-xylylenebis(pyridyltriazole)." IUCrData 8, no. 4 (2023). http://dx.doi.org/10.1107/s2414314623003620.

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A tetradentate ligand, namely, ortho-xylylenebis(pyridyltriazole), o-xpt, was synthesized using the `click' method and complexed with Pd(BF4)2. In the title complex, bis{μ-1,1′-(o-xylylene)bis[4-(pyridin-2-yl)triazole]-κN 3:N 3′}dipalladium(II) tetrakis(tetrafluoridoborate)–dimethylformamide–diethyl ether (1/2/1), as the BF4 salt, and including dimethylformamide and diethyl ether solvent molecules, with stoichiometry [Pd2(C22H18N8)2](BF4)4·2C3H7NO·C4H10O, the Pd complex and the disordered diethyl ether molecule lie on inversion centers. The ligand coordinates to the PdII centers with square-planar geometry, forming a dimeric macrocycle. The Pd...Pd separation in the complex [Pd2(o-xpt)2]4+ cation is 3.6184 (4) Å. In the crystal, the complex molecules are stacked along the b axis, with π–π interactions between the pyridyltriazole ligands of two molecules.

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Journal articles on the topic 'Square-planar PdII complexes'

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