Reactions of N,N′-n-propylene-bis(acetylacetoneimino) metal (II), M[n-P-(AI)₂], where M=Ni(II) or Pd(II), with nitrosating reagents have been investigated. Mono- and di-nitrosated complexes were obtained selectively, depending upon the concentration of the nitrosating reagents and the reaction time. In both the cases, the γ-CH group is transformed to an ambidentate isonitroso group (>C=NOH), which coordinates to the metal ion by dislodging the already coordinated carbonyl group. The factors influencing the mode of binding of the isonitroso group have been discussed. The bromination reactions of the mono-nitrosated products of M[n-P-(AI)₂] and Pd (II) complexes, Pd [E/i-P-(AI)₂], where E/i-P-(AI)₂ is a dianion of ethylene/i-propylene-bis (acetylacetoneimine), are also reported. The reaction products have been characterized by elemental analyses, electrical conductivity molecular weight determination, and ir, pmr and electronic spectral data.

Iron (III) complexes of the type Fe(R−L)₃, where R−L is a Schiff base derived from a β-diketone L, (acetoacetanilide, AN; acetoaceta-p-toluidide, AP and benzoylacetone, BA) and primary amines RNH₂ (ammonia, methyl amine or ethyl amine) have been synthesised and characterised by analysis, magnetic moment, electronic, infrared and Mössbauer spectra.

Hydrazinium acetate, metavanadate, sulfite, sulphamate and thiocyanate have been prepared by the reaction of corresponding ammonium salts with hydrazine hydrate. The compounds were characterised by chemical analysis and infrared spectra. Thermal behaviour of these hydrazinium derivatives have been investigated using thermogravimetry and differential thermal analysis.

The nitrosation of monophenylamido substituted quadridentate Schiff base complexes of copper(II) are observed to adopt N-bonded isonitroso coordination whereas the phenylisocyanation of the corresponding mononitrosated quadridentate complexes are found to prefer O-bonded isonitroso coordination.

Complexes of the type [M(N₂H₄)₂(NCS)₂], where M = Mn(II), Fe(II), Co(II), Ni(II), Zn(II), Cd(II) and Mg(II) have been prepared and characterized by chemical analysis. infrared and Mössbauer spectroscopy and magnetic moments. Hydrazine acts as a bridge between the two metal ions through the N-atom forming a distorted octahedral environment around the metal ion. Thermal decomposition of the complexes was studied in air and nitrogen atmosphere usingtg anddta techniques. The thermal stability of the complexes in nitrogen and the M-N stretching frequencies of M-NCS and M-N₂H₄ obey Irwing-Williams order for the bivalent metal complexesi. e. Mn²⁺<Fe²⁺<Co²⁺<Ni²⁺>Zn²⁺>Cd²⁺