HALOGENOMETALATES OF TRANSITION-ELEMENTS WITH N-HETEROCYCLIC BASE CATIONS .1. THE CRYSTAL-STRUCTURES OF 1,4-DIMETHYLPIPERAZINIUM-TETRACHLOROCOBALTATE(II) AND 1,4-DIMETHYLPIPERAZINIUM-TETRACHLOROZINCATE(II), (DMPIPZH(2))[MIICL(4)] (M=CO, ZN)

The compounds (dmpipzH(2))[M(11)Cl(4)] crystallize in the monoclinic space group P2(1)/m with a = 6.133(1), b = 14.306(1), c = 6.902(1) Angstrom, beta = 90.54(2)degrees, Z = 2 for M = Co and with a = 6.141(1), b = 14.282(1), c = 6.907(1) Angstrom, beta = 90.60(2)degrees, Z = 2 for M = Zn. The structures consist of tetrahedra [MCl(4)](2-) and centrosymmetric cations (dmpipzH(2))(2+) in the chair form. Bifurcated hydrogen bridging bonds of the N-H ... Cl type connect the nitrogen atom to two chloride ions. Two short distances C ... Cl are interpreted in terms of C-H ... Cl hydrogen bridges.