synthesis and crystal structures of three new hetero-binuclear hg(ii)-cu(ii) schiff base complexes

New hetero-binuclear hg-cu schiff base complexes were prepared by reaction of 2,2'-[1,1'-(2,2-dimethylpropane-1,3-diyldinitrilo)- diethyldyne]diphenolato}copper(ii) (cul^1) and 6,6'-x-2,2'-[(2,2-dimethylpropane-1,3-diyl)bis(nitrilomethanylylidene)]diphenolato copper(ii) [(x = ethoxy (cul^2) and methoxy (cul^3)], with hgcl2 to give [cu(l^1)hgcl2] (1), [cu(l^2)hgcl2] (2), and [cu(l^3)hgcl2] (3), respectively. in the precursor cu(ii) complexes (cul^1-cul^3), the coordinated phenolic oxygen atoms and those of the substituents at 3,3'- positions (in 2 and 3) on aromatic ring can act as additional site of coordination to hgcl2 as metallo-ligand to make heterobinuclear cu-hg complexes. the h2l^1, h2l^2 and h2l^3 schiff base ligands were characterized by elemental analyses, 1h nmr and ft ir techniques. the related binuclear cu-hg complexes were characterized by elemental analyses and single-crystal x-ray diffraction. the main coordination sites for the hgcl2 unit are phenolic oxygen atoms and there are also short intramolecular hg…o (methoxy and ethoxy segments) contacts in 2 and 3. the crystal packing of 3 shows one-dimensional extended chains along the b-axis through pair of centro-symmetric c-h…cl interactions. the new complexes crystallize in pbca (1), p21/n (2), and p21/c (3) space groups.