Two different 2,2′-bipyridine cadmium(II) perchlorate complexes, [Cd(2,2′-bipy)2(H2O)(ClO4)]ClO4 and [Cd(2,2′-bipy)3](ClO4)2•0.5 2,2′-bipy, syntheses, characterization, thermal and structural studies

Reactions of 2,2'-bipyridine (2,2'-bipy) with cadmium perchlorate in a ratio of M: L 1 : 2 and 1 : 3 give complexes with stoichiometry [Cd(2,2'-bipy)(2)(H2O)(ClO4)]ClO4 (1) and [Cd(2,2'-bipy) (3)](ClO4)(2) . 0.5 2,2'-bipy (2), respectively. The new complexes were characterized by elemental analyses and IR-, H-1-, C-13-NMR spectroscopy. The crystal structures of the [Cd(2,2'-bipy) (2)(H2O)(ClO4)]ClO4 (1) and [Cd(2,2'-bipy)(3)](ClO4)(2) . 0.5 2,2'-bipy (2) were determined by X-ray crystallography and the their thermal behavior studied by TG and DTA. Complexes 1 and 2 are built up of monomeric [Cd(2,2'-bipy)(2)(H2O)(ClO4)]ClO4 and [Cd(2,2'-bipy)(3)] (ClO4)(2) . 0.5 2,2'-bipy with Cd2+ coordination, CdN4OwaterOperchlorate and CdN6, respectively. There are classical O-H center dot center dot center dot O-perchlorate hydrogen bonds in complex 1 and non-classical C-H center dot center dot center dot O-perchlorate approaches in complex 2. The monomeric units of 1 and 2 grow into dimeric and one-dimensional units by packing via hydrogen bonding.