SYNTHESIS AND CHARACTERIZATION OF SOME ZINC, CADMIUM AND MERCURY(II) DERIVATIVES OF BIS(4-METHYLPYRAZOL-1-YL) ALKANES

The interaction between bis(4-methylpyrazol-1-yl)methane, L, and various MX2 (M = Zn, X = Cl, Br or 1; M = Cd, X = Cl, Br, I or NO3; M = Hg, X = Cl, Br, 1, CN or SCN) gives the 1:1 adducts [L]MX2, which are air- and thermally stable. The ligand also gives 2:1 {[L]2Zn(CF3SO3)2-2H2O, [L]2Zn(NO3)2.3H2O, [L]2Cd(ClO4)2.H2O, [L]2Hg(CF3CO2)2} and 3:1 {[L]3Zn(ClO4)2, [L]3Zn(BF4)2, [L]3Zn(CF3CO2)2.H2O, [L]3Cd(BF4)2.H2O, [L]3Hg(ClO4)2.H2O} adducts with good acceptors. All the complexes have been characterized from analytical and spectral (IR, far-IR, H-1 and C-13 NMR) data. The adduct [L]HgCl2, stable in pyridine solution, readily reacts with PPh3 and 2,2'-bipyridyl (Bipy) to yield (PPh3)2HgCl2 and (Bipy)HgCl2, respectively. Comparison is made with the results obtained with group 12 derivatives of other poly(azol-1-yl)alkanes.