METAL-COMPLEXES OF IMINO-OXIMES - CO(III), NI(II) AND CU(II) COMPLEXES OF SOME ALKYLIMINO DERIVATIVES OF ISONITROSOPROPIOPHENONE

Synthesis and characterisation of Co(III), Ni(II) and Cu(II) complexes of some alkylimino derivatives of isonitrosopropiophenone (HINPP) are reported. All the complexes have been synthesised in situ as none of the alkylimino derivatives could be isolated. The diamagnetic nature o f the Co(III) complexes indicates their octahedral geometry while the diamagnetism and spectral features of the Ni(II) suggest a square-plan ar environment for the Ni(II) ion. The magnetic data in the case of th e Cu(II) complexes indicate magnetically dilute Cu(II) with one unpair ed electron. The EPR spectra suggest a square-planar or elongated octa hedral environment, which is further supported by absorption and/or di ffuse reflectance spectra of the Cu(II) complexes. The infrared spectr al studies reveal a Co-N5O chromophore for the Co(III) complexes in wh ich two five-membered rings, involving bonding through oximino nitroge n and alkylimino nitrogen atoms, coexist along with a six-membered rin g involving bonding between the Co(III) ion and oximino oxygen and alk ylimino nitrogen atoms. In the case of the Ni(II) and Cu(II) complexes presence of M - N3O chromophore is suggested.