METAL-COMPLEXES WITH CYANOGUANIDINE AS LI GAND - CRYSTAL-STRUCTURES OF [CD(CNGE)(2)F-2]CENTER-DOT-3H(2)O, CD(CNGE)(2)BR-2 AND HG(CNGE)CL-2 (CNGE EQUALS CYANOGUANIDINE)

Crystals of [Cd(cnge)(2)F-2]. 3H(2)O (1), Cd(cnge)(2)Br-2 (2) and Hg(c nge)Cl-2 (3) (cnge = cyanoguanidine) were obtained by crystallisation from solutions of CdF2, CdBr2 or HgCl2 and cyanoguanidine in water/eth anol or methanol. I crystallizes monoclinically, space group C2, Z = 2 , a = 1629.2(4), b = 1056.6(4), c = 353.9(1) pm, beta = 101.05(2)degre es; 2 is monoclinic, space group P2(1)/n, Z = 2, a = 391.9(1), b = 850 .7(2), c = 1722.1(4) pm, beta = 94.06(2)degrees, 3 is triclinic, space group P1, Z = 1, a = 686.7(1), b = 693.0(5), c = 387.2(4) pm, alpha = 94.45(5)degrees, beta = 95.05(4)degrees, gamma = 78.58(5)degrees. In 1 and 2 each Cd atom is bonded to four halogen atoms to form polymeric (CdF2)(n) and (CdBr2)(n) chains, resp., and to two cyanoguanidine mol ecules. In 3 each Hg atom is bonded to four chlorine atoms also formin g (HgCl2)(n) chains, which are connected via cyanoguanidine molecules acting as a bidentate bridging ligands to form a network.