Synthesis of one- and two-dimensional zinc and cadmium complexes with 4,4′-bipy

The zinc(II) and cadmium(II) complexes [Zn(4,4'-bipy)(SCN)(2)](infinity), 1 and [Cd(4,4'-bipy)-(SCN)(2)](n), 2 have been synthesized and their crystal structures determined by X-ray crystallography. Complex 1 is monoclinic, space group C2/c, with a = 18.076(5), b = 5.190(1), c = 17.315(4) Angstrom; beta = 115.54(2), V = 1465.8(8) Angstrom(3), calculated density 1.530 g cm(-3), Z = 4. In this compound, the rod-like ligand 4,4'-bipy bridges Zn(II) centres, and the NCS groups are terminally coordinated. (N-Zn-N) is 108.5 degrees, resulting in the formation of a zigzag Zn-bipy-Zn chain. These chains are arranged in parallel fashion. The 4,4'-bipy ligands of adjacent layers are separated by 3.95 (Angstrom). Complex 2 is monoclinic, space group C2/c, a = 11.902(2); b = 11.745(2), c = 10.500(2) Angstrom; beta = 109.71(3), V = 1381.8(4)Angstrom(3), calculated density 1.849 gem, Z = 4. In this structure, the cadmium(II) ion is slightly distorted octahedral and the SCN groups act as doubly bridging ligands connecting cadmium atoms to form zigzag chains, separated by 4,4'-bipy to create two-dimensional planes.