The Lewis-base behaviour of some hexa- n-alkylamino triphosphonitriles

Abstract

Infra-red—and proton magnetic resonance—data indicate that the acidic proton in the hexa-amino triphosphonitrile hydrohalides, N 3P 3(NHR) 6·HX (X = Cl, Br), is bonded to a ring imido nitrogen atom rather than to the ring as a whole or to the nitrogen atom of a substituted amino group. Additional Lewis-base character is shown by the formation in acetonitrile of specific adducts of the general type [M II{N 3P 3(NHR) 6} x ] 2+ (R = n-C 3H 7, n-C 4H 9; x = 1, 2, 6; M II = Co 2+, Ni 2+, Cu 2+). Furthermore, charge-transfer induced alterations in visible and ultraviolet spectra suggest comparable interaction between the Lewis acid iodine and various hexa-amino triphosphonitriles.