Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Two New closo- or nido-Carborane Diphosphine Complexes: Synthesis, Characterization and Crystal Structures

  • Kong, Lingqian (Dongchang College, Liaocheng University) ;
  • Zhang, Daopeng (College of Chemical Engineering, Shandong University of Technology) ;
  • Su, Fangfang (School of Chemistry and Chemical Engineering, Liaocheng University) ;
  • Li, Dacheng (School of Chemistry and Chemical Engineering, Liaocheng University) ;
  • Dou, Jianmin (School of Chemistry and Chemical Engineering, Liaocheng University)
  • Received : 2011.04.02
  • Accepted : 2011.05.19
  • Published : 2011.07.20
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Abstract

Two new carborane complexes containing closo- or nido-carborane diphosphine ligands with the formula: complex $[Hg(7,8-(PPh_2)_2-7,8-C_2B_9H_{10})_2]$ $CH_2Cl_2$ (1) and $[Ag_2({\mu}-Cl)_2(1,2-(P^iPr_2)_2-1,2-C_2B_{10}H_{10})_2]$ (2) have been synthesized and characterized by elemental analysis, 1H and 13C NMR spectroscopy and X-ray structure determination. The X-ray structure analyses revealed that the carborane diphosphine ligand was degraded from closo-1,2-$(PPh_2)_2-1,2-C_2B_{10}H_{10}$ to nido-[$7,8-(PPh_2)_2-7,8-C_2B_9H_{10}]^-$ in complex 1, while the closo nature of the starting ligand $1,2-(P^iPr_2)_2-1,2-C_2B_{10}H_{10}$ was retained in complex 2. In either of the two complexes, the carborane diphosphine ligand was coordinated bidentately to the Hg(II) or Ag(I) center through its two phosphorus atoms, therefore forming a five-member cheating ring between the carborane ligand and the metal center. The coordination geometry of the metal atom is distorted tetrahedron formed by $P_4$ unit in complex 1 and $P_2Cl_2$ unit in complex 2, respectively.

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References

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