Transition metal complexes of phenylacetates and substituted phenyacetates with neutral hydrazine as a ligand.

Some hydrazine carboxylates of the type Co(PhAc)2(N2H4)2 , where M = Co, Ni, Cd and Mn , M(Di-PhAc)21.5N2H4.H2O, M = Co, Ni and Cd, M(2,4 di-Cl PhAc)21.5N2H4.H2O where M = Co, Ni and Cd, have been prepared and studied. The compositions of the complexes have been determined by chemical analyses. The electronic spectra suggest the octahedral geometry for the metal complexes. The IR absorption bands of N-N stretching in the range 958 – 975 cm-1 unambiguously prove the bidentate bridging nature of the N2H4 ligand. All prepared complexes undergo two, three or multi step decomposition and the final products are found to be the respective metal oxide, metal carbonate, metal of mixture of metal oxide and metal carbonate or metal as indicated by thermal analysis. In order to know the isomorphous nature among the complexes the X–ray patterns have been compared.

Synthesis and characterization of some hydrazine derivatives with α, β unsaturated acids.

Some new metal cinnamate monohydrazinate, M(cin)2N2H4 (M = Co or Zn), metal cinnamate dihydrazinates, M(cin)2(N2H4)2 (M = Co, Ni, Zn or Cd), metal crotonate dihydrazinates, M(crot)2(N2H4)2 (M = Co or Ni), nickel crotonate monohydrazinate monohydrate Ni(crot)2.N2H4.H2O and Cd(crot)2(N2H4)2.H2O have been prepared and characterized by physico – chemical studies. Electronic spectral data suggest that the octahedral environment around the central metal ion. The IR spectral data confirm the bridging bidentate coordination of hydrazine molecules (n N – N 976 – 959 cm-1). The Dn (n asy - n sym) separation suggest that the carboxyl group is monodentatively coordinated in metal cinnamate and crotonate dihydrazinate complexes, whereas monohydrazinate complexes show smaller Dn separation, indicating chelate bidentate coordination of the carboxylate groups to the central metal ion. All the complexes undergo two or three steps exothermic or endothermic decomposition to give respective carboxylates through metal carboxylate intermediate. X – ray powder diffraction pattern reveal that complexes with same formulation posses isomorphism.