A phosphorus-31 nuclear magnetic resonance study of amino-derivatives of the chlorocyclophosphazenes, N3P3Cl6 and N4P4Cl8

Abstract

The proton decoupled 31P n.m.r. spectra of an extensive series of primary and secondary amine derivatives of N3P3Cl6 and N4P4Cl8 have been recorded and analysed. 1H-{31P} INDOR studies show that P–N–P coupling constants for cis-N3P3Cl3(NMe2)3, N3P3(NMe2)6, and N4P4(NMe2)8 are positive. Trends in 31P chemical shifts and P–N–P coupling constants are discussed and compared with similar data for chloro(phenyl)- and amino(phenyl)-cyclophosphazenes. The appearance of ‘virtual coupling’ effects in the 1H spectra of some of these derivatives and the origins of broadening effects in the 31P spectra are discussed.