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Journal articles on the topic 'Pyridine amide ligand'

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Published: 5 June 2025

Last updated: 1 August 2025

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1

Okumura, Takeshi, Yasuhiro Funahashi, Tomohiro Ozawa, Koichiro Jitsukawa, and Hideki Masuda. "Structure and Characterization of Fe(III) Complexes with a Square Planar Ligand and the Effect by the Introduction of External Monodentate Axial Ligands." Advanced Materials Research 11-12 (February 2006): 335–38. http://dx.doi.org/10.4028/www.scientific.net/amr.11-12.335.

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A square planar iron complex with H2babp was synthesized and its coordination behaviors with monodentate axial ligands were studied. Cl– or imidazole ligand coordinated at the axial positions of the complex, but pyridine could not be introduced. The heterocyclic nitrogen donors, such as pyridine and imidazole, abstracted the amide protons of the ligand H2babp [1]. The oxidation reactivity was controlled by the presence or absence of amide protons of planar ligand H2babp rather than the axial ligands. The oxidation of cyclohexene by their complexes in the presence of PhIO proceeded catalyticall

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2

Perić, Berislav, Zoran Kokan та Srećko I. Kirin. "Induction of Λ-helicity in a zinc complex with an alanine-appended aminopyridine ligand". Acta Crystallographica Section C Structural Chemistry 77, № 8 (2021): 449–57. http://dx.doi.org/10.1107/s2053229621006471.

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The crystal structure of tris[dimethyl 5-({1-[(pyridin-2-yl-κN)carbamoyl-κO]ethyl}carbamoyl)benzene-1,3-dicarboxylate]zinc(II) dinitrate acetonitrile trisolvate, [Zn(C19H19N3O6)3](NO3)2·3CH3CN or [Zn(L)3](NO3)2·3CH3CN, (1), has been determined by single-crystal X-ray diffraction. The neutral ligand L coordinates to the Zn2+ cation in a bidentate fashion via the pyridine N atom and an amide O atom, forming a six-membered chelate ring. The Λ-helical chirality of the Zn2+ coordination sphere is induced by pendant L-alanine residues through stacking interactions between the arene groups of two coo

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3

Singh, Netra Pal, Maitreyi Singh, Anand Ratnam, and Anuroop Kumar. "Carboxamide-based Fluorescent Sensor for the Detection of Mg2+ and Ni2+ Ions." Asian Journal of Chemistry 36, no. 6 (2024): 1371–76. http://dx.doi.org/10.14233/ajchem.2024.31405.

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In this work, pyridine-2,6-dicarboxamide based ligand was synthesized by reacting pyridine-2,6-dicarboxylic acid with a thiazole derivative. The synthesized ligand was characterized by 1H NMR and 13C NMR, IR spectroscopic and mass spectrometry. The UV-visible spectrum accompanied with fluorescent spectral studies, binding constants and limit of detection proved efficient sensing abilities. The ligand was found to bind with one equivalent of an M2+ ion as validated by Job’s plot and binding parameters. The novel fluorescent probe based on amide ligand exhibits precise and selective response to

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4

Marvaniya, Vanita, Hirak V. Joshi, Ujashkumar A. Shah, and Jayvadan K. Patel. "Docking, Synthesis and Anticancer Activity of 4-(4-(3-(4-Chloro-3-(trifluoromethyl)- phenyl)ureido)phenoxy)-N-(2-morpholinoethyl)picolinamide Derivatives." Asian Journal of Chemistry 34, no. 6 (2022): 1457–64. http://dx.doi.org/10.14233/ajchem.2022.23772.

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A new series of diaryl urea derivatives bearing pyridine moiety were designed, synthesized and evaluated for their biological activity. In this study, we applied the structure-based virtual screening (SBVS) on the high similar sorafenib approved drug, selected from the DrugBank database as well as on a series of derivatives, selected from the literature. Aim was to provide new potent anticancer agents. Analysis was performed using AutoDock VINA tools. Based on the ligand binding energy. Compounds will be synthesized by chlorination of pyridine acid derivative which further coupled with amine a

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5

Attwood, Max, Hiroki Akutsu, Lee Martin, Toby J. Blundell, Pierre Le Maguere, and Scott S. Turner. "Exceptionally high temperature spin crossover in amide-functionalised 2,6-bis(pyrazol-1-yl)pyridine iron(ii) complex revealed by variable temperature Raman spectroscopy and single crystal X-ray diffraction." Dalton Transactions 50, no. 34 (2021): 11843–51. http://dx.doi.org/10.1039/d1dt01743h.

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6

Rood, Jeffrey A., Ashley M. Landis, Daniel R. Forster, Timothy Goldkamp, and Allen G. Oliver. "Solvent dependence of the solid-state structures of salicylaldiminate magnesium amide complexes." Acta Crystallographica Section C Structural Chemistry 72, no. 12 (2016): 990–96. http://dx.doi.org/10.1107/s2053229616018593.

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There are challenges in using magnesium coordination complexes as reagents owing to their tendency to adopt varying aggregation states in solution and thus impacting the reactivity of the complexes. Many magnesium complexes are prone to ligand redistributionviaSchlenk equilibrium due to the ionic character within the metal–ligand interactions. The role of the supporting ligand is often crucial for providing stability to the heteroleptic complex. Strategies to minimize ligand redistribution in alkaline earth metal complexes could include using a supporting ligand with tunable sterics and electr

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7

Nakanishi, Yuki, Shoichi Sugita, Kentaro Okano, and Atsunori Mori. "Intramolecular C–H arylation of pyridine derivatives with a palladium catalyst for the synthesis of multiply fused heteroaromatic compounds." Beilstein Journal of Organic Chemistry 20 (December 13, 2024): 3256–62. https://doi.org/10.3762/bjoc.20.269.

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The C–H arylation of 2-quinolinecarboxyamide bearing a C–Br bond at the N-aryl moiety is carried out with a palladium catalyst. The reaction proceeds at the C–H bond on the pyridine ring adjacent to the amide group in the presence of 10 mol % Pd(OAc)2 at 110 °C to afford the cyclized product in 42% yield. The yield is improved to 94% when the reaction is performed with PPh3 as a ligand of palladium. The reaction is examined with amides derived from unsubstituted picoline, 6-methylpicoline, and 2,6-pyridinedicarboxylic acid in a similar manner to afford the cyclized products in 70%, 77%, and 87

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8

Manessi-Zoupa, Evy, Theodoros F. Zafiropoulos, and Spyros P. Perlepes. "Preparation and Properties of Rhodium(III) Complexes with the Tetradentate Ligand N,N'-Bis(2'-pyridinecarboxamide)-1,8-naphthalene." Zeitschrift für Naturforschung B 49, no. 1 (1994): 111–18. http://dx.doi.org/10.1515/znb-1994-0118.

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AbstractSynthetic procedures are described that allow access to a number of new Rh(III) complexes with the tetradentate bis-amide ligand N,N'-bis(2'-pyridinecarboxamide)-1,8-naphthalene (LH2). These complexes have the formulae Rh(LH2)Cl3, Na[RhLX2] • H2O (X = Cl, CN) and [RhLA2]ClO4 (A = pyridine, 1-methylbenzotriazole). The compounds have been characterized by elemental analyses, conductivity measurements, X-ray powder patterns, spectroscopic (IR, UV/VIS, 1H NMR) studies and electrochemical methods. The neutral amide behaves as a bis-bidentate ligand in the oligomeric or polymeric, octahedral

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9

Smolentsev, Anton I. "Copper(II) bromide, nitrate and perchlorate complexes with sterically demanding N-(6-methylpyridin-2-yl)acetamide ligands." Acta Crystallographica Section C Structural Chemistry 73, no. 8 (2017): 613–19. http://dx.doi.org/10.1107/s2053229617009949.

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Functionalized acid amides are widely used in biology, medicine, environmental chemistry and many other areas. Among them, pyridine-substituted amides, in particular N-(pyridin-2-yl)acetamide and its derivatives, play an important role due to their excellent chelating properties. The donor properties of these ligands can be effectively modified by introducing electron-donating substituents (e.g. alkyl groups) into the heterocycle. On the other hand, substituents in the α-position of the pyridine ring can create steric hindrance, which significantly influences the coordination number and geomet

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10

Mori, Asami, Takayoshi Suzuki, and Kiyohiko Nakajima. "Crystal structure of bis(2,2′-bipyridine)[N′-(quinolin-2-ylmethylidene)pyridine-2-carbohydrazide]ruthenium(II) bis(tetrafluoridoborate) dichloromethane trisolvate." Acta Crystallographica Section E Crystallographic Communications 71, no. 2 (2015): 142–45. http://dx.doi.org/10.1107/s2056989015000122.

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The title compound, [Ru(C10H8N2)2(C16H12N4O)](BF4)2·3CH2Cl2, crystallizes with one complex dication, two BF4−counter-anions and three dichloromethane solvent molecules in the asymmetric unit. The central RuIIatom adopts a distorted octahedral coordination sphere with two 2,2′-bipyridine (bpy) and one quinoline-2-carbaldehyde (pyridine-2-carbonyl)hydrazone (HL) ligand. The hydrazone ligand has aZform and coordinates to the RuIIatomviathe amide-O and imine-N atoms, affording a planar five-membered chelate ring, while its pyridine-N and quinoline-N donor atoms in the substituents are non-coordina

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11

D., P. SINGH, N. ANSARI M., and B. RANA V. "Synthesis of some 3d-Metal Complexes of 2,6-Diacetylpyridine(benzyl and acetone )hydrazone." Journal of Indian Chemical Society Vol. 74, Jun 1997 (1997): 448–51. https://doi.org/10.5281/zenodo.5880538.

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Department of Chemistry, S. D. College, Muzaffarnagar-251 001 Department of Chemistry. Meerut College, Meerut <em>Manuscript received 29 February 1996, accepted 2 April 1996</em> 2,6-Diacetylpyridine bis(benzyl and acetone)hydrazone and some 3d-metal complexes have been prepared. These complexes are five-coordinated trigonal bipyramidal. The ligand coordinates through the pyridine-N and amide-N. Formation of two chelate rings by one molecule of ligand, is a feature that undoubtedly enhances the stability of the complexes.

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12

Borisova, Nataliya E., Anastasiia V. Kharcheva, Kirill D. Shmelkov, et al. "Formation of Complexes of f-Elements with Electron-Withdrawing N-Heterocyclic Diamides: Extraction and Solution Photophysics." Metals 13, no. 12 (2023): 2024. http://dx.doi.org/10.3390/met13122024.

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To examine the scope of the abnormal aryl strengthening effect (an increase in the extraction of metal ions when an aromatic substituent is introduced into the amide group) on f-metal extraction, a series of tetradentate diamide-type extragents bearing electron-withdrawing pyridine rings in amide moieties of the molecules were tested. The solvent extraction of Am(III)/Eu(III) pairs was investigated under various conditions, the solution chemistry of the lanthanide-extragents systems was studied, and the bonding constants were calculated for complexes of Eu(III) and Tb(III) ions with diamides.

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13

D., P. SINGH, N. ANSARI M., and B. RANA V. "Synthesis of some 3d-Metal Complexes of 2,6-Diacetylpyridine(benzyl and acetone)hydrazone." Journal of Indian Chemical Society Vol. 74, Sep 2001 (2001): 448–51. https://doi.org/10.5281/zenodo.5883413.

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<strong>Department of Chemistry, S. D. College, Muzaffarnagar-251 001 </strong> <strong>Department of Chemistry. Meerut College, Meerut</strong> <strong><em>Manuscript received 29 February 1996, accepted 2 April 1996</em></strong> <strong>2,6-Diacetylpyridine bis(benzyl and acetone)hydrazone and some 3d-metal complexes have been prepared. These complexes are five-coordinated trigonal bipyramidal. The ligand coordinates through the pyridine-N and amide-N. Formation of two chelate rings by one molecule of ligand, is a feature that undoubtedly enhances the stability of the complexes.</strong>

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14

D., P. SINGH, N. ANSARI M., and B. RANA V. "Synthesis of some 3d-Metal Complexes of 2,6-Diacetylpyridine(benzyl and acetone)hydrazone." Journal of Indian Chemical Society Vol. 74, Sep 2001 (2001): 448–51. https://doi.org/10.5281/zenodo.5883506.

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<strong>Department of Chemistry, S. D. College, Muzaffarnagar-251 001 </strong> <strong>Department of Chemistry. Meerut College, Meerut</strong> <strong><em>Manuscript received 29 February 1996, accepted 2 April 1996</em></strong> <strong>2,6-Diacetylpyridine bis(benzyl and acetone)hydrazone and some 3d-metal complexes have been prepared. These complexes are five-coordinated trigonal bipyramidal. The ligand coordinates through the pyridine-N and amide-N. Formation of two chelate rings by one molecule of ligand, is a feature that undoubtedly enhances the stability of the complexes.</strong>

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15

Deng, Ji-Hua, Gui-Quan Guo та Di-Chang Zhong. "Bis[N-aminocarbonyl-N′-(3-pyridylmethylene-κN)hydrazine]diaquabis(thiocyanato-κN)zinc(II)". Acta Crystallographica Section E Structure Reports Online 63, № 11 (2007): m2696—m2697. http://dx.doi.org/10.1107/s1600536807048908.

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The Zn atom of the title complex, [Zn(NCS)2(C7H8N4O)2(H2O)2] or [Zn(SCN)2(H-Pysc)2(H2O)2] [H-Pysc = N-aminocarbonyl-N′-(3-pyridylmethylene)hydrazine], derived from the condensation of pyridine-3-carbaldehyde and semicarbazone, is located at a crystallographic centre of inversion and is octahedrally coordinated by two thiocyanate anions, two aqua molecules and two molecules of the neutral Schiff base ligand H-Pysc. The Schiff base molecules act as monodentate ligands coordinating the metal through the pyridyl N atom, whereas the amide O and imine N atoms remain uncoordinated. The crystal packin

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16

Bouwkamp, Marco W., Emil Lobkovsky, and Paul J. Chirik. "Bis(imino)pyridine Ligand Deprotonation Promoted by a Transient Iron Amide." Inorganic Chemistry 45, no. 1 (2006): 2–4. http://dx.doi.org/10.1021/ic051839o.

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17

Aşkın, Gülçin Şefiye, Hacali Necefoğlu, Safiye Özkaya, Raziye Çatak Çelik та Tuncer Hökelek. "Crystal structure of diaquabis(N,N-diethylnicotinamide-κN1)bis(2,4,6-trimethylbenzoato-κO1)cobalt(II)". Acta Crystallographica Section E Crystallographic Communications 72, № 4 (2016): 498–501. http://dx.doi.org/10.1107/s2056989016004059.

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The centrosymmetric molecule in the monomeric title cobalt complex, [Co(C10H11O2)2(C10H14N2O)2(H2O)2], contains two water molecules, two 2,4,6-trimethylbenzoate (TMB) ligands and two diethylnicotinamide (DENA) ligands. All ligands coordinate to the CoIIatom in a monodentate fashion. The four O atoms around the CoIIatom form a slightly distorted square-planar arrangement, with the distorted octahedral coordination sphere completed by two pyridine N atoms of the DENA ligands. The dihedral angle between the planar carboxylate group and the adjacent benzene ring is 84.2 (4)°, while the benzene and

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18

Cadoni, Enrico, Pedro R. Magalhães, Rita M. Emídio, et al. "New (Iso)quinolinyl-pyridine-2,6-dicarboxamide G-Quadruplex Stabilizers. A Structure-Activity Relationship Study." Pharmaceuticals 14, no. 7 (2021): 669. http://dx.doi.org/10.3390/ph14070669.

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G-quadruplex (G4)-interactive small molecules have a wide range of potential applications, not only as drugs, but also as sensors of quadruplex structures. The purpose of this work is the synthesis of analogues of the bis-methylquinolinium-pyridine-2,6-dicarboxamide G4 ligand 360A, to identify relevant structure–activity relationships to apply to the design of other G4-interactive small molecules bearing bis-quinoline or bis-isoquinoline moieties. Thermal denaturation experiments revealed that non-methylated derivatives with a relative 1,4 position between the amide linker and the nitrogen of

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19

Wang, Zhaodong. "Synthesis and Structure of the Copper Complex[Cu2L2ox(SO4)(H2O)4](H2O)4." E3S Web of Conferences 290 (2021): 01010. http://dx.doi.org/10.1051/e3sconf/202129001010.

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The reaction of N-(pyridine-2-ylmethyl)pyrazine-2-carboxamide (HL) and copper(II) sulfate leads to the formation of a new copper complex, [Cu2L2ox(SO4)(H2O)4](H2O)4(1), in which the deprotonated amide L-ligand was oxidized to a imide Lox-exposed to the air in the presence of the Cu ion. The X-ray crystal analysis reveals that it consists of two mononuclear copper unit with different coordination modes, multiple O-H…O hydrogen bonding between water molecules or water and sulfate O atom to form 3D networks. CCDC: 2088935,1.

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Aiswarya, N., M. Sithambaresan, M. R. Prathapachandra Kurup та Seik Weng Ng. "Dichlorido{2-[(E)-phenyl(pyridin-2-yl-κN)methylidene]-N-phenylhydrazinecarboxamide-κ2N2,O}copper(II)". Acta Crystallographica Section E Structure Reports Online 69, № 11 (2013): m588—m589. http://dx.doi.org/10.1107/s1600536813026883.

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The title compound, [CuCl2(C19H16N4O)], contains a CuIIatomN,N′,O-chelated by a neutralN-phenylhydrazinecarboxamide ligand and additionally coordinated by two Cl atoms, resulting in a distorted square-pyramidal geometry. The ligating atoms in the basal square plane of the complex comprise the azomethine N, the pyridine N, the amide O and one of the Cl atoms, whereas the other Cl atom occupies an apical position. The apical Cl atoms in adjacent layers function as hydrogen-bond acceptors to both NH groups. Intermolecular C—H...Cl and C—H...O interactions are also observed.

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21

Sharmila, Pandey, and Mukherjee Rabindranath. "Crystal structure of dichloro[(N-phenylcarbamoyl)pyridine]bis(dimethylsulphoxide)ruthenium(II). A voltammetric study to monitor acid-base controlled N,O to N,N donor site switch over†." Journal of Indian Chemical Society Vol. 93, Sep 2016 (2016): 1027–34. https://doi.org/10.5281/zenodo.5639140.

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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 <em>E-mail</em> : rnm@iitk.ac.in, rnm@iiserkol.ac.in <em>Manuscript received 05 September 2016, accepted 14 September 2016</em> Reaction between (N-phenylcarbamoyl)pyridine (HL<sup>1</sup> ) and [Ru<sup>II</sup>(DMSO)<sub>4</sub>Cl<sub>2</sub> ] in refluxing ethanol affords crystalline of [Ru<sup>II</sup>(HL<sup>1</sup> )(DMSO)<sub>2</sub>Cl<sub>2</sub> ] with co

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22

Ke, Shaoyong. "Novel amide-type ligand bearing bis-pyridine cores: Synthesis, spectral characterizations and X-ray structure analyses." Journal of Molecular Structure 1118 (August 2016): 91–97. http://dx.doi.org/10.1016/j.molstruc.2016.04.012.

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23

Lin, Hong-Yan, Qian-Qian Liu, Yuan Tian, and Ling Zeng. "Two new bis(pyridine)-bis(amide)-based copper(II) coordination compounds for the electrochemical detection of trace Cr(VI) and efficient electrocatalytic oxygen evolution." Zeitschrift für Naturforschung B 77, no. 2-3 (2022): 157–64. http://dx.doi.org/10.1515/znb-2021-0180.

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Abstract Two new metal-organic compounds (MOCs) [Cu(L)0.5(3-nba)2] (1) and [Cu(L)(2,5-tdc)] (2) have been hydrothermally synthesized by employing the ligand N,N′-di(3-pyridyl)adipoamide (L) and two carboxylic acids (3-Hnba = 3-nitrobenzoic acid, 2,5-H2tdc = 2,5-thiophenedicarboxylic acid) as ligands. Compound 1 displays a metal-organic chain-like structure formed by the {Cu2(3-nba)4} double-paddle wheel units and the µ 2-bridging L ligands. The adjacent polymeric chains form a supramolecular layered structure through hydrogen bonding. Compound 2 shows a 3D metal-organic polymeric framework der

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24

Haris, Nur Shuhaila Haryani, Nafisah Mansor, Mohd Sukeri Mohd Yusof, Christopher J. Sumby, and Maisara Abdul Kadir. "Investigating the Potential of Flexible and Pre-Organized Tetraamide Ligands to Encapsulate Anions in One-Dimensional Coordination Polymers: Synthesis, Spectroscopic Studies and Crystal Structures." Crystals 11, no. 1 (2021): 77. http://dx.doi.org/10.3390/cryst11010077.

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The synthesis of amide-based molecules, possessing pre-organized structures, has received significant attention due to their potential applications as molecular receptors and as components of nanomaterials. In this study, four extended tetraamide ligands incorporating ethylene and propylene spacers, namely 1,2-bis[N,N′-6-(3-pyridylmethylamido)pyridyl-2-carboxyamido]ethane (L1), 1,2-bis[N,N′-6-(4-pyridylmethylamido)pyridyl-2-carboxyamido]ethane (L2), 1,2-bis[N,N′-6-(3-pyridylmethylamido)pyridyl-2-carboxyamido]propane (L3) and 1,2-bis[N,N′-6-(4-pyridylmethylamido)pyridyl-2-carboxyamido]propane (

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25

Tapas, Ghosh. "Mixed-ligand oxovanadium(IV) complexes with N-benzene sulfonyl-L-aspartic acid and 2,2' -hi pyridine and 1,10-phenanthroline." Journal of Indian Chemical Society Vol. 81, Nov 2004 (2004): 957–58. https://doi.org/10.5281/zenodo.5833433.

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Department of Chemistry, R. K. Mission V. C. College, P.O. Rahara, Kolkata-700 118, India <em>E-mail</em> : ictg_64@yahoo.co.in <em>Manuscript received 28 October 2003, revised 22 April 2004, accepted 11 June 2004</em> <em>N</em>-Benzene sulfonyl-L-aspartic acid (hereafter, H<sub>3</sub>L) in the presence of 2,2'-hipyridine or 1,10-phenanthroline (hereafter, B) on reaction with VOSO<sub>4</sub><strong> </strong>in aqueous-ethanolic medium at pH \(\sim\)4.5 afforded complexes of the type<strong> </strong>[VIVO(HL)(8)(H<sub>2</sub>O)].H<sub>3</sub>L<strong> </strong>acts as a hidentate dineg

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Kirkina, Vladislava A., Vasilisa A. Kulikova, Evgenii I. Gutsul, et al. "The Role of Non-Covalent Interactions in the Reactions between Palladium Hydrido Complex with Amidoarylphosphine Pincer Ligand and Brønsted Acids." Inorganics 11, no. 5 (2023): 212. http://dx.doi.org/10.3390/inorganics11050212.

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The interaction between (PNP)PdH (1); PNP = bis(2-diisopropylphosphino-4-methylphenyl)amide and different acids (CF3SO3H, HBF4∙Et2O, fluorinated alcohols and formic acid) was studied in benzene or toluene as well as in neat alcohols by IR and NMR spectroscopies. The structures of hydrogen-bonded complexes were also optimized at the DFT/ωB97-XD/def2-TZVP level. The nitrogen atom of the amidophosphine pincer ligand readily accepts proton not only from strong Brønsted acids but from relatively weak fluorinated alcohols. That suggests that binding to palladium(II) increases the diarylamine basicit

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Hökelek, Tuncer, Safiye Özkaya та Hacali Necefoğlu. "Crystal structure and Hirshfeld surface analysis of diaquabis(N,N-diethylnicotinamide-κN 1)bis(2,4,6-trimethylbenzoato-κO)manganese(II)". Acta Crystallographica Section E Crystallographic Communications 74, № 4 (2018): 422–27. http://dx.doi.org/10.1107/s2056989018003377.

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In the title centrosymmetric complex, [Mn(C10H11O2)2(C10H14N2O)2(H2O)2], the MnII cation is located on an inversion centre. The four O atoms form a slightly distorted square-planar arrangement around the MnII cation, and the distorted octahedral coordination is completed by two pyridine N atoms at distances of 2.3289 (15) Å. The dihedral angle between the planar carboxylate group and the adjacent benzene ring is 87.73 (16)°, while the benzene and pyridine rings are oriented at a dihedral angle of 43.03 (8)°. In the crystal, the water molecules are involved in both intramolecular (to the non-co

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Opalade, Adedamola A., Elizabeth N. Grotemeyer, and Timothy A. Jackson. "Mimicking Elementary Reactions of Manganese Lipoxygenase Using Mn-hydroxo and Mn-alkylperoxo Complexes." Molecules 26, no. 23 (2021): 7151. http://dx.doi.org/10.3390/molecules26237151.

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Manganese lipoxygenase (MnLOX) is an enzyme that converts polyunsaturated fatty acids to alkyl hydroperoxides. In proposed mechanisms for this enzyme, the transfer of a hydrogen atom from a substrate C-H bond to an active-site MnIII-hydroxo center initiates substrate oxidation. In some proposed mechanisms, the active-site MnIII-hydroxo complex is regenerated by the reaction of a MnIII-alkylperoxo intermediate with water by a ligand substitution reaction. In a recent study, we described a pair of MnIII-hydroxo and MnIII-alkylperoxo complexes supported by the same amide-containing pentadentate l

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29

Sengupta, Satirtha, and Raju Mondal. "Elusive Nanoscale Metal-Organic-Particle-Supported Metallogel Formation Using a Nonconventional Chelating Pyridine-Pyrazole-Based Bis-Amide Ligand." Chemistry - A European Journal 19, no. 18 (2013): 5537–41. http://dx.doi.org/10.1002/chem.201204242.

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30

Elshafie, Hazem S., Sadeek A. Sadeek, Ippolito Camele, and Amira A. Mohamed. "Biological and Spectroscopic Investigations of New Tenoxicam and 1.10-Phenthroline Metal Complexes." Molecules 25, no. 5 (2020): 1027. http://dx.doi.org/10.3390/molecules25051027.

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In the present work, tenoxicam (H2Ten) reacted with Mn(II), Co(II), Ni(II), Cu(II) and Zn (II) ions in the presence of 1.10-phenthroline (Phen), forming new mixed ligand metal complexes. The properties of the formed complexes were depicted by elemental analyses, infrared, electronic spectra, proton nuclear magnetic resonance (1H NMR), mass spectrometry, thermogravimetric (TGA) and differential thermogravimetric (DTG) analysis, molar conductance and magnetic moment. IR spectra demonstrated that H2Ten acted as a neutral bidentate ligand, coordinated to the metal ions via the pyridine-N and carbo

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31

Mishra, Anurag, Hiren Bhajiwala, Ajay Kothari, and Virendra Kumar Gupta. "A New Class of Pyridine-Amide Containing Ti and Zr Based Catalysts for Olefin Polymerization: Influence of Ligand Substituents." Catalysis Letters 149, no. 12 (2019): 3425–31. http://dx.doi.org/10.1007/s10562-019-02907-3.

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Matsumoto, Kenji, Keita Suzuki, Toshiaki Tsukuda, and Taro Tsubomura. "A Chiral 2,6-Bis(Oxazolinyl)Pyridine Ligand with Amide Groups to Form Isomorphous Complexes through All the Lanthanoid Series." Inorganic Chemistry 49, no. 11 (2010): 4717–19. http://dx.doi.org/10.1021/ic901743q.

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33

Govindaraj, Manivannan, Wei-Chun Huang, Chia-Yi Lee, et al. "Structural Diversity of Mercury(II) Halide Complexes Containing Bis-pyridyl-bis-amide with Bulky and Angular Backbones: Ligand Effect and Metal Sensing." International Journal of Molecular Sciences 23, no. 14 (2022): 7861. http://dx.doi.org/10.3390/ijms23147861.

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Hg(II) halide complexes [HgCl2] 2L1 [L1 = N,N’-bis(3-pyridyl)bicyclo(2,2,2,)oct-7-ene-2,3,5,6-tetracarboxylic diamide), 1, [HgBr2(L1)]n, 2, [HgI2(L1)], 3, [Hg2X4(L2)2] [X = Cl, 4, Br, 5, and I, 6; L2 = N,N’-bis(4-pyridylmethyl)bicyclo(2,2,2,)oct-7-ene-2,3,5,6-tetracarboxylic diamide] and {[HgX2(L3)]⋅H2O}n [X = Cl, 7, Br, 8 and I, 9; L3 = 4,4′-oxybis(N-(pyridine-3-yl)benzamide)] are reported and structurally characterized using single-crystal X-ray diffraction analyses. The linear HgCl2 units of complex 1 are interlinked by the L1 ligands through Hg---N and Hg---O interactions, resulting in 1D

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34

Stritt, Anika, E. Alper Ünal, Elisabeth Irran, and Andreas Grohmann. "“Coordination caps” of graded electron-donor capacity." Zeitschrift für Naturforschung B 79, no. 12 (2024): 705–22. https://doi.org/10.1515/znb-2024-0093.

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Abstract An efficient synthesis of the novel {6-[1,1-di(pyridin-2-yl)ethyl]pyridine-2-yl}2-methyl-1,3-propanediamine (2) is reported, as well as a reliable large-scale synthesis (of the order of 100 g) of previously known 2,2’-[1-(6-chloropyridin-2-yl)ethane-1,1-diyl]dipyridine (4); the latter is the starting material for the preparation of the former, as well as a multitude of other polypodal polyamine/polyimine ligands. Both materials, as well as the intermediates in their multi-step syntheses, have been fully characterised. Ligand 2, in conjunction with ligands 2,2’-(pyridine-2,6-diyl)bis(2

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35

Napitupulu, Mery, Geoffrey A. Lawrance, Guy J. Clarkson, and Peter Moore. "Methyl 2-[N-(2′-Pyridylmethyl)carbamyl]pyridine-6-carboxylate: A Precursor for Unsymmetrical Diamide Ligands." Australian Journal of Chemistry 59, no. 11 (2006): 796. http://dx.doi.org/10.1071/ch06310.

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Methyl 2-[N-(2′-pyridylmethyl)carbamyl]pyridine-6-carboxylate (H1), prepared by reaction of a 1:1 ratio of the methyl diester of pyridine-2,6-dicarboxylic acid and 2-aminomethylpyridine, can form 1:2 M:L complexes by acting as a tridentate ligand, as exemplified by a crystal structure analysis of [CoIII(1)2](ClO4) where each ligand is coordinated by the amido group and its two flanking pyridine groups, with the ester group, a relatively poor donor, remaining unbound. The acid formed upon ester hydrolysis, hydrogen 2-[N-(2′-pyridylmethyl)carbamyl]pyridine-6-carboxylate (H22), has been isolated

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36

Singh, Akhilesh Kumar, V. Balamurugan, and Rabindranath Mukherjee. "Synthesis and Characterization of Low-Spin and Cation Radical Complexes of Ruthenium(III) of a Tridentate Pyridine Bis-Amide Ligand." Inorganic Chemistry 42, no. 20 (2003): 6497–502. http://dx.doi.org/10.1021/ic034356y.

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37

Sharma, Anuj Kumar, Saikat Biswas, Suman Kumar Barman, and Rabindranath Mukherjee. "Azo-containing pyridine amide ligand. A six-coordinate nickel(II) complex and its one-electron oxidized species: Structure and properties." Inorganica Chimica Acta 363, no. 12 (2010): 2720–27. http://dx.doi.org/10.1016/j.ica.2010.03.056.

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38

Chiassai, Leonardo, Rafael Ballesteros-Garrido, Maria Paz Clares, Enrique García-España, Rafael Ballesteros, and Belén Abarca. "Combining Amines and 3-(2-Pyridyl)-[1,2,3]Triazolo[1,5-a]pyridine: An Easy Access to New Functional Polynitrogenated Ligands." Synthesis 51, no. 21 (2019): 4034–42. http://dx.doi.org/10.1055/s-0037-1611901.

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Triazolopyridine-pyridine amine ligands are easily obtained by means of either thermal- or copper(II)-mediated reactions. Starting from a readily accessible iodo derivative of triazolopyridine-pyridine and different amines, this new family of compounds combines aromatic and aliphatic nitrogen atoms with promising coordinating properties. Furthermore, chemical derivatization of a new triazolopyridine-pyridine diamine compound, N1-[6-([1,2,3]triazolo[1,5-a]pyridin-3-yl)pyridin-2-yl]ethan-1,2-diamine, allows the preparation of several remote-pyridine-containing ligands.

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39

Wang, Xiu-Li, Xiao-Mei Wu, Guo-Cheng Liu, Nai-Li Chen, Hong-Yan Lin, and Xiang Wang. "Structural Diversity and Properties of Six ZnII/CdII Coordination Polymers Based on an O-Bridged Semi-Rigid Bis-pyridyl-bis-amide and Different Dicarboxylates." Australian Journal of Chemistry 69, no. 8 (2016): 846. http://dx.doi.org/10.1071/ch15728.

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Six new coordination polymers [Zn2(L)(chdc)2]·2H2O (1), [Zn(L)(mip)]·3H2O (2), [Zn(L)(bdc)]·H2O (3), [Cd2(L)(chdc)2]·2H2O (4), [Cd(L)(mip)]·2H2O (5), and [Cd(L)(bdc)]·2H2O (6) (L = N,N′-bis(pyridine-3-yl)-4,4′-oxybis(benzoic) dicarboxamide, 1,4-H2chdc = trans-1,4-cyclohexanedicarboxylic acid, H2mip = 5-methylisophthalic acid, 1,3-H2bdc = 1,3-benzenedicarboxylic acid) have been synthesized from ZnII/CdII ions and L ligands in the presence of auxiliary dicarboxylates via hydrothermal or solvothermal reaction. The coordination polymers have been fully characterized by infrared spectroscopy, powde

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40

Frey, Steven T., Hillary A. Ramirez, Manpreet Kaur, and Jerry P. Jasinski. "Crystal structure of a seven-coordinate manganese(II) complex with tris(pyridin-2-ylmethyl)amine (TMPA)." Acta Crystallographica Section E Crystallographic Communications 74, no. 8 (2018): 1075–78. http://dx.doi.org/10.1107/s2056989018009611.

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Structural analysis of (acetato-κ2 O,O′)(methanol-κO)[tris(pyridin-2-ylmethyl)amine-κ4 N,N′,N′′,N′′′]manganese(II) tetraphenylborate, [Mn(C2H3O2)(C18H18N4)(CH3OH)](C24H20B) or [Mn(TMPA)(Ac)(CH3OH)]BPh4 [TMPA = tris(pyridin-2-ylmethyl)amine, Ac = acetate, BPh4 = tetraphenylborate] by single-crystal X-ray diffraction reveals a complex cation with tetradentate coordination of the tripodal TMPA ligand, bidentate coordination of the Ac ligand and monodentate coordination of the methanol ligand to a single MnII center, balanced in charge by the presence of a tetraphenylborate anion. The MnII complex

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41

Lai, Willetta, Man-Kit Lau, Victor Chong, Wing-Tak Wong, Wa-Hung Leung, and Nai-Teng Yu. "The metal–carbon stretching frequencies in methyl complexes of Rh, Ir, Ga and In with porphyrins and a tetradentate pyridine–amide ligand." Journal of Organometallic Chemistry 634, no. 1 (2001): 61–68. http://dx.doi.org/10.1016/s0022-328x(01)01097-x.

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42

Jacob, Wilson, and Rabindranath Mukherjee. "Coordination polymers of manganese(II) and cobalt(II) of a flexible tetradentate pyridine amide ligand: 1D zigzag network and non-covalent interactions." Inorganica Chimica Acta 361, no. 5 (2008): 1231–38. http://dx.doi.org/10.1016/j.ica.2007.08.006.

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43

Li, Mei-Ying, Pei-Zhi Hu, Jun-Cheng Zhu, Yi Liu, and Kuo-Xi Xu. "Study on Syntheses and Anti-bacterial Activities of Some New Transition Metal Complexes with Schiff Base Ligand Containing Pyridine and Amide Moieties." Chinese Journal of Chemistry 22, no. 2 (2010): 162–66. http://dx.doi.org/10.1002/cjoc.20040220211.

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44

Chitranshi, Nitin, Ashutosh Kumar, Samran Sheriff, et al. "Identification of Novel Cathepsin B Inhibitors with Implications in Alzheimer’s Disease: Computational Refining and Biochemical Evaluation." Cells 10, no. 8 (2021): 1946. http://dx.doi.org/10.3390/cells10081946.

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Amyloid precursor protein (APP), upon proteolytic degradation, forms aggregates of amyloid β (Aβ) and plaques in the brain, which are pathological hallmarks of Alzheimer’s disease (AD). Cathepsin B is a cysteine protease enzyme that catalyzes the proteolytic degradation of APP in the brain. Thus, cathepsin B inhibition is a crucial therapeutic aspect for the discovery of new anti-Alzheimer’s drugs. In this study, we have employed mixed-feature ligand-based virtual screening (LBVS) by integrating pharmacophore mapping, docking, and molecular dynamics to detect small, potent molecules that act a

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45

Bradberry, Samuel J., Aramballi Jayant Savyasachi, Robert D. Peacock, and Thorfinnur Gunnlaugsson. "Quantifying the formation of chiral luminescent lanthanide assemblies in an aqueous medium through chiroptical spectroscopy and generation of luminescent hydrogels." Faraday Discussions 185 (2015): 413–31. http://dx.doi.org/10.1039/c5fd00105f.

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Herein we present the synthesis and the photophysical evaluation of water-soluble chiral ligands (2·(R,R) and 2·(S,S)) and their application in the formation of lanthanide directed self-assembled structures. These pyridine-2,6-dicarboxylic amide based ligands, possessing two naphthalene moieties as sensitising antennae, that can be used to populate the excited state of lanthanide ions, were structurally modified using 3-propanesultone and caesium carbonate, allowing for the incorporation of a water-solubilising sulfonate motif. We show, using microwave synthesis, that Eu(iii) forms chiral comp

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46

Tounsi, Nassera, Laurent Dupont, Emmanuel Guillon, and Michel Aplincourt. "Interaction of copper(II) and nickel(II) with a bis-amide ligand functionalized with pyridine moieties: Thermodynamic and spectroscopic studies in aqueous solution." Inorganica Chimica Acta 360, no. 8 (2007): 2598–608. http://dx.doi.org/10.1016/j.ica.2006.12.033.

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47

Comba, Peter, Hubert Wadepohl, and Arkadius Waleska. "Redox Properties of Iron Complexes with Pentadentate Bispidine Ligands." Australian Journal of Chemistry 67, no. 3 (2014): 398. http://dx.doi.org/10.1071/ch13454.

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The solution coordination chemistry of iron complexes with the pentadentate bispidine ligands L1, L2, and L3 (dimethyl 9-oxo-2,4-di(pyridin-2-yl)-3,7-diazabicyclo[3.3.1]nonane-1,5-dicarboxylate derivatives) was examined. While in acetonitrile, (L1,2)FeII/III species have a preference for Cl– as co-ligand. The corresponding aqua and hydroxido complexes also prevail in the presence of Cl– in aqueous solution. The observed FeII/III potentials in water (cyclic voltammetry) and potentials of (L1–3)FeIV=O (buffered and unbuffered aqueous solutions) are strikingly similar, i.e. the latter are assigne

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48

Wang, Yan, Yu Liu, Xiao-Sa Zhang, Jian Luan, Ai-Ai Yang, and Wen-Ze Li. "Effect of secondary bis-pyridine-bis-amide ligand on the construction of Zn-based coordination polymers and the enhancement of ultrasensitive luminescent sensing properties." Journal of Solid State Chemistry 315 (November 2022): 123516. http://dx.doi.org/10.1016/j.jssc.2022.123516.

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49

Sonam, D. Das, and P. P. Das. "Spectral properties of Ni(II) complex of a tridentate pyridine-amide ligand with appended ether functionality [n-(2-Methoxyphenyl)picolinamide]: Theoretical and Experimental studies." Journal of Physics: Conference Series 2349, no. 1 (2022): 012023. http://dx.doi.org/10.1088/1742-6596/2349/1/012023.

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Carboxamide groups due to its biological abundance and significance in the primary structure of proteins/metalloenzymes, has been long investigated as donor functionality in synthetic inorganic coordination chemistry. Spectral studies and their theoretical encounters are gaining enormous importance. Electronic detail structure, along with TD-DFT and FT-IR vibrational frequencies of, [Ni(II)L2], HL = N-(2-methoxyphenyl)picolinamide were studied by DFT calculations and are compared with their experimental counterparts. Nice agreement of these two was obtained. Ni(II) utilizes all possible donor

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50

Lindley, Brian M., Peter T. Wolczanski, Thomas R. Cundari, and Emil B. Lobkovsky. "First-Row Transition Metal and Lithium Pyridine-ene-amide Complexes Exhibiting N- and C-Isomers and Ligand-Based Activation of Benzylic C–H Bonds." Organometallics 34, no. 19 (2015): 4656–68. http://dx.doi.org/10.1021/acs.organomet.5b00385.

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