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8451794 
Journal Article 
Phosphorus-31 NMR of Triphenylphosphine Oxide Complexes with Compounds of Silicon, Germanium, and Tin 
Zeldin, M; Mehta, P; Verngn, WD 
1979 
Yes 
Inorganic Chemistry
ISSN: 0020-1669
EISSN: 1520-510X 
18 
2 
463-466 
English 
Phosphorus-31 NMR of equimolar mixtures of Ph3PO and compounds of the main group 4 elements in toluene exhibits downfield coordination shifts from the free base. The data are interpreted in terms of the formation of adduct complexes in solution. Analysis of the concentration dependency of the chemical shift permits the determination of the formation constant of the 1:1 complex and the change in chemical shift upon complexation where the 1:1 complex is the predominant species in solution. Thus,[FORMULA OMMIETD] More complicated data, observed for SiCl4-Ph3PO solutions, suggest multiple equilibria. Data analysis at very low concentration gives [FORMULA OMMIETD] ppm. Additionally, an effect of added MeCN on the chemical shift of Ph3PO-Me3SiCl solutions has been observed and interpreted in terms of a coordinate interaction between the nitrilic group and silicon. © 1979, American Chemical Society. All rights reserved.