Studies on Metal Carboxylates. Part II. Cobalt(II) and Nickel(II) Complexes of Certain Pyridine Carboxylic Acids and Pyridine-3-Sulfonic Acid: Magnetic and Spectral Studies

Abstract

Several pyridine carboxylate complexes of cobalt(I1) and nickel(I1) have been prepared and their spectral and magnetic properties and X-ray powder patterns used to establish their stereochemistry. The cobalt(I1) complex of pyridine-3-carboxylic acid Co[3-py(C0,)],~4H20, whose crystal structure we have previously reported, was used as a model for a consideration of the structural details of these complexes. Like the latter cobalt(I1) derivative, the nickel(I1) complex of pyridine-3-carboxylic acid and the cobalt(l1) and nickel(I1) complexes of pyridine-4-cartioxylic acid and pyridine-3-sulfonic acid, isolated as their tetrahydrates, are formulated as non-classical zwitterions. Comparisons are made with the related pyridine carboxylate complexes of silver(I1).On a prepare plusieurs complexes carboxylate de pyridine de cobalt(I1) et de nickel(I1) et on a utilise leurs proprietes spectrales et magnetiques et leurs spectres de poudres par rayons-)< pour 6tablir leur stereochimie. Le complexe de cobalt(I1) de l'acide pyridine-carboxylique-3 Co[3-py(CO2)],~4H2O, dont la structure cristalline a tte rapportee prCc6demment, a kt6 utilise comme modele dans 1'6tude des details structuraux de ces complexes. Comme le derive du cobalt(I1) precedent, le complexe de nickel(I1) de l'acide pyridine-3 carboxylique et les complexes de cobalt(I1) et de nickel(I1) l'acide pyridine-4 carboxylique et de I'acide pyridine-3 sulfonique, isoles sous forme de tetrahydrates, sont formules comme ttant des zwitterions non-classiques. On compare ensuite ces complexes a ceux de l'argent(II), soient les complexes pyridine carboxylate.

Magnetic field-induced formation of molecule-based magnetic material [Co1.5(N3)(OH)(L)]n with antiferromagnetic coupling

“…The structures of Y and R have been reported in previous literature [13,15,16]. Here we simply describe their structures.…”

Mn(II), Fe(II), Co(II), Ni(II), Cu(II) and Zn(II) transition metals isonicotinate complexes: Thermal behavior in N2 and air atmospheres and spectroscopic characterization

“…According to the crystalline structure described in the literature for these compounds, in which the two ligands coordinates to one metal center through the pyridine nitrogen atom in a trans configuration, and four coordinated water molecules, resulting in an approximately octahedral geometry [5,29] the dehydration process was expected to cause such change. This is because the crystalline lattice is held by hydrogen bonds formed between the oxygen atoms from the carboxylate group and the hydrogen atoms from coordinated water molecules.…”

Interaction of niacin with nickel(II) ions

“…In recent years a number of various nicotinamide and nicotinate metal complexes have been synthesized in solid state and their physico-chemical properties were characterized by spectroscopic, crystallographic and thermal methods [9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Different coordination mode of ligands in these complexes were proposed.…”