COORDINATION-COMPOUNDS OF 2,6-DIACETYLPYRIDINEDIHYDRAZONE .3. PREPARATION AND CHARACTERIZATION OF THE COMPLEXES WITH BIOLOGICALLY IMPORTANTMAGNESIUM(II), CALCIUM(II) AND ZINC(II) IONS

The magnesium(II), calcium(II) and zinc(II) nitrate complexes of 2,6-d iacetylpyridi-nedihydrazone (L) have been prepared and formulated as [ MgL(NO3)(H2O)](NO3), [Mg(2)L(3)(H2O)(2)](NO3)(4).H2O, [CaL(NO3)(2)(H2O )].H2O, [Ca(2)L(3)(NO3)(2)(H2O)(2)](NO3)(2).H2O, [ZnL(H2O)(2)](NO3)(2) , [Zn(2)L(3)(H2O)](NO3)(4) and [ZnL(2)](NO3)(2).H2O on the basis of sp ectral data, thermal and elemental analysis. The correlation of the na ture of metal ion and preparative conditions with the stoichiometry an d bonding mode of both ligand and nitrate ions is discussed.