3-D Hydrogen-Bonded Frameworks of Two Metal Complexes with Chelidamic Acid: Syntheses, Structures and Magnetism

Abstract

Complexes M(C 7 H 2 NO 5 )3H 2 O·H 2 O·0.25MeCN (M=Ni, Co) were crystallized from the reactions of Ni(CH 3 COO) 2 ·4H 2 O or Co(CH 3 COO) 2 ·2H 2 O with KSCN and 2,6-dicarboxy-4-hydroxypyridine (chelidamic acid). The structures were characterized by X-ray crystallography. The crystal structures of 1 and 2 show a distorted octahedral coordination geometry around the M(II) ions, which are chelated by one nitrogen atom and two oxygen atoms of the chelidamic acid and three water molecules. Complexes 1 and 2 display the hydrogenbonded 3D framework. The magnetic behavior of 2 exhibits antiferromagnetic interaction.