Thermal behaviour of complexes of antipyrine derivatives II

Labádi, I.; Czibulya, Zs.; Tudose, Ramona; Costişor, Otilia

doi:10.1007/s10973-005-0462-0

Cited by 11 publications

(6 citation statements)

References 9 publications

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“…Imidazoles and transition metal complexes of imidazoles are also known to display therapeutic activity [21]. Knowledge of the exact structure of these complexes may help to clarify their biological, physical, and chemical properties and help elucidate the mechanisms of their therapeutic action.…”

Section: Introductionmentioning

confidence: 99%

Nickel(II) and copper(II) complexes of 2-(2-pyridyl)benzimidazole: synthesis and structural characterization

Altaf

Stœckli-Evans

2009

Transition Met Chem

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2-(2-Pyridyl)benzimidazole (PBI) was synthesized by solvent-free aldol condensation and complexed with nickel(II) and copper(II) nitrate and perchlorate salts by simple reactions at room temperature. The transition metal complexes [Ni(PBI) were synthesized in good yield and structurally characterized by X-ray crystallography, infrared absorption spectroscopy, and elemental analysis. Complexes 1 and 3 are isostructural, crystallizing in the same space group P2 1 /c. Both the nickel(II) and copper(II) atoms have distorted square pyramidal geometries. The metal centers in these complexes are coordinated by two molecules of the bidentate ligand (PBI) and an O-atom of the coordinated nitrate anion. Complexes 2 and 4 are also isostructural but do not crystallize in the same space group: P-1 for 2 and Pccn for 4. The geometry around both the nickel(II) and the copper(II) centers is distorted octahedral. Here, the metal atoms are coordinated by three molecules of 2-(2-pyridyl)benzimidazole. The copper(II) complex 4 has 2-fold symmetry with one of the three PBI ligands being positionally disordered about the 2-fold axis. Intermolecular N-HÁÁÁO hydrogen bonds, involving the NH H-atom and an O-atom of the coordinated nitrate anion, are observed in all four complexes. In 1 and 3, this gives rise to the formation of centrosymmetric dimer-like structures that are decorated by hydrogen-bonded nitrate anions. In 2 and 4 the perchlorate anions and the water molecules of crystallization are involved in N-HÁÁÁO and O-HÁÁÁO hydrogen bonds bridging two symmetry-related cations, thus forming cyclic arrangements. In the case of complex 4, this leads to the formation of two-dimensional hydrogen-bonded networks parallel to plane (011).

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Section: Introductionmentioning

confidence: 99%

Nickel(II) and copper(II) complexes of 2-(2-pyridyl)benzimidazole: synthesis and structural characterization

Altaf

Stœckli-Evans

2009

Transition Met Chem

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“…Transition metal complexes of N-heterocyclic imidazole-based ligands containing an acidic N–H proton have been studied extensively for various reasons, such as their interesting intermolecular non-covalent interaction properties, 1–10 magnetic behaviours, 4,11–14 proton-coupled-electron-transfer properties 15,16 and biological and pharmaceutical activities. 17–21 The non-covalent interactions in the imidazole-based metal complexes involving hydrogen bonding (due to the N–H group of the imidazolyl moiety), π⋯π stacking, halogen⋯π interaction and C–H⋯π interactions have great importance in crystal engineering and have been investigated in much detail by the X-ray crystallography methods. 22–25 Attaching an extra aromatic pyridine moiety with an imidazole moiety such as in L can increase the possibility of π⋯π stacking and C–H⋯π interactions in its metal complexes.…”

Section: Introductionmentioning

confidence: 99%

“…(19)1, Cl1a-Ni1-N2 is 92.66(18)1, Cl1-Ni1-Cl1a is 94.46(7)1 and N2-Ni1-N2a is 169.7(3)1. The nickel-imidazole distances [Ni1-N2, 2.031(16) Å] are considerably shorter than the nickel-pyridine distances [Ni1-N1 of 2.122(17) Å] as expected due to the more s-donating as well as more p-accepting nature of the imidazole moiety compared to the pyridine moiety 61.…”

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confidence: 99%

A hemilabile 2-(2′-pyridyl)-imidazole based nickel(ii) complex: proton-coupled-electron-transfer, bactericidal and cytotoxicity studies

et al. 2022

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“…Presuming that the biological activity may be affected by the number of antipyrine fragments in the ligand molecule, Co(BAMP)(NCS) 2 [23], M 2 (L)X n where L¼BAMP, TAMEN were obtained [24][25][26][27][28][29][30] and for some of them the structure has been resolved [31][32][33][34][35][36]. Both BAMP and TAMEN contain antipyrine fragments disposed symmetrically on each side of the piperazine or ethylenediamine bridge, respectively.…”

Section: Introductionmentioning

confidence: 99%

Mixed-ligand complexes of iron(II), iron(III), copper(II), and cobalt(II) with pyrazolonic and 2,2′-bipyridine ligands

Tudose

Mosoarca

Simulescu

et al. 2010

Journal of Coordination Chemistry

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New mixed-ligand complexes, [M 2 (BAMP)(bipy) 2 ][MCl 4 ] 2 , M¼Co þ2 (1), Cu þ2 (2), [M 2 (TAMEN)(bipy) 2 ][MCl 4 ] 2 , M¼Fe þ2 (3), Co 2þ (4), and [Fe 2 (TAMEN)(bipy) 2 ][FeCl 6 ] 2 (5), where BAMP and TAMEN stand for the Mannich bases N,N 0 -bis(antipyryl-4-methylene)-piperazine and N,N 0 -tetra(antipyryl-4-methylene)-1,2-ethane-diamine, respectively, have been obtained and characterized by elemental analyses, conductometric and magnetic susceptibility measurements at room temperature, mass spectrometry, UV-Vis, infrared, and mass spectroscopy, and 1 H NMR spectra for the ligands.

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Thermal behaviour of complexes of antipyrine derivatives II

Cited by 11 publications

References 9 publications

Nickel(II) and copper(II) complexes of 2-(2-pyridyl)benzimidazole: synthesis and structural characterization

Nickel(II) and copper(II) complexes of 2-(2-pyridyl)benzimidazole: synthesis and structural characterization

A hemilabile 2-(2′-pyridyl)-imidazole based nickel(ii) complex: proton-coupled-electron-transfer, bactericidal and cytotoxicity studies

Mixed-ligand complexes of iron(II), iron(III), copper(II), and cobalt(II) with pyrazolonic and 2,2′-bipyridine ligands

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