Two new 1D cadmium(II) azido complexes:: catina-poly[di-μ1,1-azido(2,2′-bipyridyl)cadmium(II)] and a new polymorph of catina-poly[di- μ1,1-azido(2-acetylpyridine)cadmium(II)]

Two new cadmium(II) azido complexes, [Cd(2,2'-bipy)(N-3)(2)](n) (1) and [Cd(2-acpy)(N-3)(2)](n) ( 2) (2,2'-bipy 2,2'-bipyridyl and 2-acpy = 2-acetylpyridine), have been synthesized and structurally characterized by single-crystal X-ray diffraction methods. The coordination environment of the central cadmium atom is distorted octahedral (MN6) in 1 and (MN5O) in 2, with one-dimensional chains formed through Cd2N2 units and alternatively chelating N, N'-bipyridyl or N, O-2-acetylpyridine groups. The central Cd(II) ion is coordinated to two nitrogen atoms of a chelating bipyridyl group or one nitrogen atom and one acetyl oxygen of 2-acetylpyridine and four nitrogen atoms of four different end-on bridging (mu(1,1)-N-3) groups. Chains in the c direction in 1 are stabilized in b direction by pi-pi interactions involving the aromatic rings of bipyridyl ligands. IR and NMR spectra of the two complexes are reported.