A correlation between p–cl bond lengths and35Cl nuclear quadrupole resonance frequencies in some cyclophosphazenes; the use of35Cl nuclear quadrupole resonance spectroscopy for structural assignments in cyclodiphosphazanes

Abstract

The 35Cl n.q.r. spectra of a series of chlorocyclophosphazenes have been obtained and are discussed in the light of their known crystal structures. An approximately linear relationship exists between 35Cl n.q.r. frequencies and P–Cl bond lengths in closely related structures. The 35Cl n.q.r. spectra of the cyclodiphosphazanes, (Cl3PNR)2(R = Me, Et, or Ph), are reported. The axial and equatorial chlorine atoms in the trigonal bipyramidal distribution of atoms about phosphorus in the latter class of compound can be identified by their frequency ranges, and by relative changes in frequency with temperature.