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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jcsc/111/06/0687-0696

    • 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

       
      Published
      December 1999
      Manuscript received
      25 June 1999
      Manuscript revised
      24 August 1999

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