Use of chlorine-35 nuclear quadrupole resonance spectroscopy for structural assignments in chlorocyclotriphosphazatrienes

Abstract

The ³⁵Cl nuclear quadrupole resonance spectra of a series of aminochlorocyclotriphosphazatrienes N₃P₃Cl_6–nR_n(R = NMe₂, n= 1–4; R = NC₅H₁₀, n= 1–3) have been recorded at 77 and/or 273 K. These data show that positional isomers may be distinguished, but that unambiguous structural assignments to geometrical isomers are not generally possible. Similar conclusions may be drawn for other aminochloro- and phenylchloro-cyclotriphosphazatrienes. Resonance frequencies diagnostic of PCl₂, PCl·NR₂, and PClPh groups fall in the ranges 26–29, 22–25, and 23–25 MHz respectively, but the last two groups cannot be distinguished by this technique.