Asymmetric molecules with asymmetry parameters values

In the heterocycle 16, P and Se high-resolution solid-state NMR spectroscopy was used to study structural properties. Both P CP/MAS and Se CP/ MAS experiments revealed that the asymmetric unit consists of two independent molecules with a different geometry around phosphorus and selenium centres. The established values of anisotropy and asymmetry parameters reflected the distortion of the phosphorus environment, and correlated with X-ray diffraction data. P NMR spectroscopy has been used to follow a new type of P-decomposi-tion in diphosphorylated amines and to characterise new organophosphorus compounds with -N-P(0)-N- linkages. A series of dioxaphosphocin-6-oxides (17), of varying substituent X, have been characterised by using P NMR and... 

It is instructive to follow the differences in the respective linear and quadratic coefficients of the function and first derivative terms in each equation, in the order of number of factors in the corresponding square roots, or of Eqs. (36, 64, 69, 49,54 and 59) in Ref. [4] for P starting with the -dependent coefficient, their successive values are + I), I — l)( + 2), I — 2) + 3), i - 3) (t + 4) for the respective species b is shifted by one-half up or down in Eq. (56) and by three halves down or up in Eq. (53), and stays the same in the other cases however, for the derivative, the quadratic term has the negative coefficients 3,5, 7, and 9, while the respective constant terms are I and 3, and the linear terms only appear in Eqs. (53 and 56) again. The changes in the -dependent coefficients and in the anergy parameters are not exclusively for the most asymmetric molecules. Their counterparts also appear for molecules wifh any asymmetry, as shown in our Section 4.2.3. 

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