77061-45-1Relevant articles and documents
Far-infrared, raman, and 31P nuclear magnetic resonance spectral investigation of the electronic effects in triarylphosphine complexes of cadmium(II) halides
Goel, Ram G.,Henry, William P.,Srivastava, Ramesh C.
, p. 1727 - 1731 (2008/10/08)
The complexes CdX2[P(p-YC6H4)3]2 and CdX2[P(m-CH3C6H4)3] 2, where X = Cl, Br, or I and Y = H, CH3, CH3O, or (CH3)2N, have been synthesized, and their far-infrared, Raman, and 31P NMR spectra have been examined. The vibrational spectral data are in accord with a pseudotetrahedral structure of C2v skeletal symmetry in the solid state. The molecular nature of the complexes, in solution, is established by molecular weight measurements in 1,2-dichloroethane. The 31P NMR spectra of the complexes in dichloromethane at ambient temperatures consist of a single broad resonance, indicating fast phosphine exchange on the NMR time scale. The satellites due to the 113Cd-31P and 111Cd-31P spin-spin couplings are observed for all the complexes except CdCl2(PPh3)2 at lower temperatures. For the complexes of a given phosphine, the magnitude of cadmium-phosphorus nuclear spin-spin coupling increases linearly with the Pauling's electronegativity of X. For the given halide, the coupling constants increase linearly with the pKa value of the phosphine. No simple relationship between the 31P chemical shifts and other parameters is observed.