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Vibrational spectra and structure of poly(dialkylaminophosphazene)s

The IR and Raman spectra of poly(dialkylaminophosphazene)s (PDAAPs) [-P(NHC m H 2m+1 ) 2 =N-] n with m = 1-7 were measured in the temperature range from -100 to +20°C and at room temperature, respectively. Vibrational modes in the spectra of PDAAPs were assigned with reference to the previously obtained spectral data on poly(dialkoxyphosphazene)s. The absence of conformational transitions due to rotation about the P-N and C-N bonds in the side groups was demonstrated for all the poly(dialkylaminophosphazene)s examined. Temperature-induced variations in the IR spectra of PDAAPs with m > 4 are due to the gauche-trans transitions resulting from internal rotation about C-C bonds in the side groups, as well as to changes in the backbone structure. No changes in the main-chain structure were observed for PDAAPs with m ≤ 4 because of the hydrogen bonds formed by NH groups.