14403-65-7Relevant academic research and scientific papers
Ditertiary phosphine complexes of nickel. Spectral, magnetic, and proton resonance studies. A planar-tetrahedral equilibrium
Van Hecke, Gerald R.,Horrocks Jr., William DeW.
, p. 1968 - 1974 (2008/10/08)
A number of complexes of nickel in oxidation states 0, II, and III with the ditertiary phosphines (C6H5)2P(CH2)nP(C 6H5)2 (n = 1, 2, or 3) are reported and studied by spectral and magnetic methods. In solution in organic solvents complexes of the type Ni[(C6H5)2P(CH2)nP(C 6H5)2]X2 where X = Br or I and n = 2 remain diamagnetic. The analogous complexes with n = 3 show a square-planar (diamagnetic)-tetrahedral (paramagnetic) equilibrium in solution. Isotropic proton magnetic resonance shifts were observed in these systems and thermodynamic parameters for the equilibrium were obtained from the temperature dependences of these shifts. The epr spectrum of polycrystalline Ni[(C6H5)2P(CH2)3P(C 6H5)2]Br3 shows an isotropic signal at g = 2.218.
