ZINC(II), CADMIUM(II) AND MERCURY(II) DERIVATIVES OF BIS(4-HALOPYRAZOL-1-YL) ALKANES - SYNTHESIS, SPECTROSCOPIC CHARACTERIZATION AND BEHAVIOR IN SOLUTION

The interaction between various bis(4-halopyrazol-1-yl)alkanes L (L = bis(3,5-dimethyl-4-chloropyrazol-1 -yl)methane, L# = bis(4-bromopyraz ol-1-yl)methane, L degrees = bis(4-chloropyrazol-1-yl)methane) and zin c(II), cadmium(II) and mercury(II) accepters gave 1:1 [LMX2] (L = L, M = Zn, X = Cl, Br, I, NO3 or CF3CO2; L = L, M = Cd, X = Cl Or Br; L I L, M = Hg, X = Cl, Br or I; L = L#, Fvl = Zn, X = Cl, Br, I or NO,; L = L#, M = Cd, X = Cl, Br, I or NO3; L = L#, M = Hg, X = Cl or Br; L = L#, M = Zn, X = Cl, M = Cd, X = I, M = Hg, X = Br), 3:2 [(L)(3)(Zn (CF3SO3)(2)}(2)].3H(2)O and [(L)(3)(Cd(NO3)(2)}(2)].2H(2)O, 2: 1 [L,M ]X, (L = L, M = Zn or Cd, X = ClO4 or BF4; L = L*, M = Hg, X - ClO4; L = L#, M = Zn, X = ClO4 or CF3SO3, M = Cd, X = ClO4 or BF4; L degrees = L, M = Cd, X = BF4) and finally 3:1 [(L#)(3)Zn](BF4)(2) adducts; t hese derivatives have been characterized through elemental analyses, s pectral data (IR, H-1 and C-13 NMR in the case of the sufficiently sol uble derivatives), conductivities and molecular weight measurements. C omparison is made with the results obtained with other bis(pyrazol-1-y l)alkanes. (C) 1997 Elsevier Science Ltd.