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  Global Journal of Inorganic Chemistry. Volume 2, Issue 1 (2011) pp. 1-4
  Research Article
Crystal structure of bis(diphenylphosphino)ethane monoxide, the first R2P(CH2)nP(O)R2 ligand to be structurally characterized
  Ashley R. Heada, Donna S. Amentaa, John W. Giljea, Glenn P. A. Yapb  
a Department of Chemistry and Biochemistry, MSC 4501, James Madison University, Harrisonburg, VA 22807, USA
b Department of Chemistry and Biochemistry, University of Delaware, Newark, DE 19716, USA

  Despite an extensive coordination chemistry, no crystal structures are available for members of the R2P(CH2)nP(O)R2 ligand class.  The first member of this class to be structurally characterized is (C6H5)2PCH2CH2P(O)(C6H5)2, which crystallizes in  the monoclinic space group, Pn with crystal cell parameters  a = 12.752(4) Å, b = 5.6664(17) Å, c = 16.110(5) Å, and β = 110.819(4)o, V = 1088.1(6)  Å3, and Z = 2. The geometry about the phosphine and phosphoryl moieties bears close resemblance to that of the analogous groups in (C6H5)2PCH2CH2P(C6H5)2 and (C6H5)2P(O)CH2CH2P(O)(C6H5)2, respectively.
  Phosphine; Phosphine oxide; Hemilabile ligand  

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