(Benzoato-κ²O,O′)(quinoline-2-carboxylato-κ²N,O)(quinoline-2-carboxylic acid-κ²N,O)manganese(II)

Abstract

Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.004 Å; disorder in main residue; R factor = 0.048; wR factor = 0.149; data-to-parameter ratio = 17.3.The crystal structure of the title compound, [Mn(C 7 H 5 O 2 )-(C 10 H 6 NO 2 )(C 10 H 7 NO 2 )], contains manganese(II) ions sixcoordinated in a distorted octahedral environment. The equatorial plane is occupied by four O atoms, two from the carboxylate group of the benzoate ion, the other two from carboxylate/carboxyl groups of the quinaldate/quinaldic acid molecules. The axial positions are occupied by the N atoms of the quinoline ring systems. The metal ion lies on a twofold rotation axis that bisects the benzoate ligand; the quinaldate and quinaldic acid ligands are therefore equivalent by symmetry, and the carboxylate/carboxyl groups are disordered. The complexes are joined together by hydrogen bonds between the carboxylate/carboxyl groups of adjacent quinaldate/quinaldic acid molecules, forming zigzag chains that run along the c axis.

(Benzoato-κ2O,O′)(quinoline-2-carboxylato-κ2N,O)(quinoline-2-carboxylic acid-κ2N,O)copper(II)

“…The non-coordinating benzoate O atom is situated at a 2.678 (3)Å distance from the metal ion. With the exception of above mentioned benzoate disorder, the title compound shows a very similar arrangement to that of the Mn(II) analog (Martins et al, 2008). The complexes are joined together by hydrogen bonds between the carboxylate/carboxyl groups of adjacent quinaldate/quinaldic acid molecules, forming zigzag chains that run along the c axis (Fig.…”

“…For related literature, see: Zurowska et al (2007); Dobrzynska et al (2005); Kumar & Gandotra (1980); Catterick et al (1974); Martins et al (2008).…”