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14N and 35Cl NQR studies of organophosphorus compounds

✍ Scribed by D. J. Osokin; I. A. Safin; I. A. Nuretdinov

Publisher
John Wiley and Sons
Year
1972
Tongue
English
Weight
352 KB
Volume
4
Category
Article
ISSN
0749-1581

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✦ Synopsis

lPN and 35Cl NQR spectra have been investigated for 24 organophosphorus compounds using a pulse technique. The electron populations of the nitrogen lone pair orbital and the N-P bond are calculated according to the Townes and Dailey method. The experimental data are interpreted assuming a partial double bond character of the N-P bond due to thep,-d, interaction and p,--a conjugation of the lone pair electrons of the nitrogen atoms. The effect of the different nature of substituents X on the N-P bond populations is observed in X = PR,'(R,N),-, molecules (where X is 0, S, Se, or lone pair electrons and n = 0, 1, 2). It can be seen from this dependence that the effective electronegativity of the phosphorus atom is largest in selenophosphoramidates and falls in the sequence P=Se > P=S > P=O > P.

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