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      https://www.ias.ac.in/article/fulltext/jcsc/131/12/0123

    • Keywords

       

      Chalcogen; binuclear complex; chalcogen-bridged.

    • Abstract

       

      Syntheses and structural elucidations of a series of chalcogen stabilized binuclear complexes of group 5 and 6 transition metals have been described. Room temperature reaction of [Cp*CrCl]2 (Cp* = h5- C5Me5) with Li[BH3(SePh)] afforded a Se inserted binuclear chromium complex, [(Cp*Cr)2(m-Se2SePh)2], 1.In an attempt to make the analogous complexes with heavier group 6 metals, reactions of [Cp*MCl4] (M = Mo and W) with Li[BH3(SePh)] were carried out that yielded Se inserted binuclear complexes [(Cp*M)2(m-Se)2(m-SePh)2], 2 and 3 (2: M = Mo and 3: M = W) along with known [(Cp*M)2B5H9], 4a–b (4a: M = Mo and 4b: M = W). Similarly, the reactions of [Cp*NbCl4] with Li[BH3(EPh)] (E = S or Se)followed by thermolysis led to the formation of binuclear chalcogen complexes [(Cp*Nb)2(m-E2)2], 5 and 6 (5: E = S and 6: E = Se) and known [(Cp*Nb)2(B2H6)6], 7. All these complexes have been characterized by 1H and 13C NMR spectroscopy and mass spectrometry. The structural integrity of complexes 1, 3, 5 and 6 was established by the X-ray diffraction studies. The DFT studies further exemplify the bonding interactions present in these complexes, especially the multiple bond character between the metals in 1–3.

    • Author Affiliations

       

      MOULIKA BHATTACHARYYA1 RINI PRAKASH1 CHANDAN NANDI1 MONOJIT GHOSAL CHOWDHURY1 BEESAM RAGHAVENDRA1 THIERRY ROISNEL2 SUNDARGOPAL GHOSH1

      1. Department of Chemistry, Indian Institute of Technology Madras, Chennai 600 036, Tamilnadu, India
      2. CNRS, ISCR (Institut des Sciences Chimiques de Rennes) – UMR 6226, Univ Rennes, 35000 Rennes, France
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