31P NMR analysis of cyclotriphosphazenes

The relationships of P-31 chemical shift with the degree of the substitution, the different kind of substituent group, reaction activation energy, and electronegativity and of the coupling constant with the degree of the substitution were investigated. The P-31 chemical shifts and the coupling constants correlate linearly with the degree of the substitution. The chemical shifts are proportional to the reaction activation energy. Observed chemical shifts are expressed and calculated with a partial chemical shift of the unit substituent group and electronegativity. These correlations can be useful for the assignment of the resonances of other related derivatives.