Abstract
Metal cinnamate monohydrazinates of the formula M(cin)2N2H4, where M= Co or Zn, nickel crotante monohydrazinate monohydrate Ni(crot)2N2H4.H2O, metal cinnamate and crotonate dihydrazinates M(cin)2(N2H4)2 Where M = Co, Ni, Zn or Cd , M(crot)2(N2H4)2 Where M = Co or Ni and cadmium crotante dihydrazinate monohydrate Cd(crot)2(N2H4)2.H2O have been prepared and characterized by spectral, thermal and X-ray diffraction studies. Electronic spectra indicate that the cobalt and nickel complexes are high-spin octahedral complexes. The IR data show that the binding of hydrazine and the unsaturated carboxylate anion to the metal ion is bidentate. TG-DTA studies show that metal complexes undergo decomposition through metal carboxylate intermediate to give respective metal oxide as the final product. Xray powder diffraction patterns of the complexes indicate isomorphism among them.
Highlights
Hydrazine complexes of the first row transition metal ions with a variety of carboxylic acids have been reported in the literature (Schmidt, 1984)
Nickel and cadmium cinnamate monohydrazinates, dihydrazinates are prepared by the reaction of the aqueous solution of the corresponding metal nitrate hydrate, aqueous solution of hydrazine hydrate and cinnamic acid
Metal crotonate complexes are prepared from the corresponding aqueous solution of metal crotonates and aqueous solution hydrazine hydrate
Summary
Hydrazine complexes of the first row transition metal ions with a variety of carboxylic acids have been reported in the literature (Schmidt, 1984) These include simple aliphatic monocarboxylic acids (Ravindranathan et al, 1983; Sivasankar et al, 1995; Sivasankar et al, 1997; Sivasankar et al, 1994) aliphatic dicarboxylic acids (Gajapathy et al, 1983; Sivasankar, et al, 1996; Sivasankar et al, 1994; Yasodhai et al, 2000; Govindarajan et al, 1995), aromatic mono and dicarboxylic acids (Kuppusamy et al, 1995 and 1996) aliphatic and aromatic hydroxyl acids (Yasadhai et al, 1999; Kuppusamy, et al, 1996), halo acids (Sivasankar et al, 2004), amino acids(Sivasankar et al, 1996; Sivasankar et al, 1994; Sivasankar, 2005) and heterocyclic carboxylic acids(Premkumar et al, 2002). In this chapter the preparation, spectral and thermal properties of some new metal cinnamate monohydrazinates, metal cinnamate and crotonate dihydrazinates, metal crotonate monohydrazinate monohydrate and metal crotonate dihydrazinate monohydrate are reported
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