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    • Keywords


      Osmium(II); arylazoimidazole complexes; azoimines; geometric isomers; azo reduction

    • Abstract


      Arylazoimidazoles (RaaiH,p-R-C6H4N=N-C3H3N2, R=H, Me, OMe, Cl and NO2) are N,N′-chelators. On reaction with (NH4)2[OsCl6], two classes of isomers blue-violetctc-Os(RaaiH)2Cl2 and red-violetccc-Os(RaaiH)2Cl2 have been isolated. The complexes have been characterised by elemental analyses, IR, UV-Vis and1H NMR spectral data. The N=N stretching is red shifted by 70–80 cm−1 compared to the free ligand values and indicatesd(Os)→π*(azo) charge shifting. This is supported by MLCT transition in the visible region.1H NMR spectra suggest that blue-violet isomers areC2-symmetric and red-violet isomers areC1-symmetric. Redox studies show the Os(III)/(II) couple of both isomers at 0·6–0·7 Vvs SCE and two successive azo reductions.

    • Author Affiliations


      Sanjib Pal1 Tarun Kumar Misra1 Pabitra Chattopadhyay1 Chittaranjan Sinha1

      1. Department of Chemistry, The University of Burdwan, Burdwan - 713 104, India
    • Dates

  • Journal of Chemical Sciences | News

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