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Academic literature on the topic 'Square-planar PdII complexes'

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Published: 5 June 2025

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

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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Academic literature on the topic 'Square-planar PdII complexes'

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