ZINC AND CADMIUM ADDUCTS OF 2,2'-BIS(PYRAZOL-1-YL)PROPANE, (L-L), A STERICALLY HINDERING LIGAND - CRYSTAL-STRUCTURE OF (L-L)ZN[OC(=O)CF3]2(H2O)

1:1 adducts between the title ligand and MX2 (M = Zn or Cd; X = Cl, Br, I or trifluoroacetate) as well as ionic compounds [(L-L)5Zn2(H2O)2](ClO4)4 and [(L-L)2Cd(H2O)2](ClO4)2 are stable in the solid state and in acetone solution, but not in dimethylsulphoxide. In (L-L)Zn(H2O)[O-C(= O)CF3]2 two oxygen atoms (belonging to water and to one O-C(= O)CF3) at 2.039(4) and 2.008(4) angstrom from Zn, and one nitrogen atom (Zn-N 2.067(3) angstrom) from the chelating L-L define the basal plane of a trigonal bipyramid, which is distorted owing to the steric requirements of the bridgehead methyls of L-L; the axial Zn-X bonds (X = N 2.125(3) angstrom; X = O 2.085(4) angstrom), are longer than the equatorial Zn-X bonds.