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14 N and 35 Cl NQR studies of organophosphorus compounds
Author(s) -
Osokin D. J.,
Safin I. A.,
Nuretdinov I. A.
Publication year - 1972
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270040607
Subject(s) - lone pair , electronegativity , chemistry , crystallography , nitrogen , chemical bond , atom (system on chip) , nitrogen atom , electron pair , molecule , electron , stereochemistry , atomic physics , ring (chemistry) , physics , organic chemistry , quantum mechanics , computer science , embedded system
14 N and 35 Cl NQR spectra have been investigated for 24 organophosphorus compounds using a pulse technique. The electron populations of the nitrogen lone pair orbital and the NP bond are calculated according to the Townes and Dailey method. The experimental data are interpreted assuming a partial double bond character of the NP bond due to the p π d π interaction and p π σ conjugation of the lone pair electrons of the nitrogen atoms. The effect of the different nature of substituents X on the NP bond populations is observed in X PR n (R 2 N) 3‐n molecules (where X is O, 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 PSe > PS > PO > P.