Syntheses and Characterization of Cyanide-Bridged Bimetallic Compounds Zn(terpy)(H2O) M(CN)4 (terpy = 2,2′:6′,2′′-ter­pyridine; M = Ni, Pd, Pt) with Linear Chains.

The self-assembly reaction of zinc ions with tetracyanometalates in the presence of the tridentate chelated ligand 2,2′:6′,2′′-terpyridine (terpy) yielded three cyanide-bridged bimetallic compounds of general formula Zn(terpy)(H2O) M(CN)4 [ M = Ni ( 1), Pd ( 2), Pt ( 3)]. Compounds 1- 3 were characterized by X-ray diffraction (XRD), infrared spectroscopy (IR), and thermogravimetric (TG) analysis. Single-crystal XRD analysis revealed that compounds 1- 3 are isostructural and the structure consists of [Zn(terpy)(H2O)]2+ moieties and [ M(CN)4]2- units linked alternatively to generate a one-dimensional (1D) linear chain. The chains are further connected together through hydrogen bonding and π-π stacking interactions, forming a 3D supramolecular network. IR spectroscopic analysis indicated the presence of cyanide groups and terpy ligands in the structure. TG and powder XRD results showed that compounds 1- 3 have higher thermal stabilities and exhibited irreversible for desorption/resorption of one coordinated water molecule. [ABSTRACT FROM AUTHOR]