Intra-versus interchain interactions in α,ω-polyamines:: a Raman spectroscopy study

Raman spectroscopy is used to examine the intra- and interchain interactions in aliphatic diamines H2N (CH2)(n)NH2 (n = 2-10 and 12) and their N-deuterated derivatives, either as a function of chainlength or as a function of temperature. The intensity of the in-phase C-C stretching mode divided by the integrated area of the N-H or the N-D stretching regions is discussed as a parameter which can be used as a quantitative measure of the average number of trans bonds in the hydrocarbon chain, while the relative intensity of the C-H antisymmetric and symmetric stretching vibrations is used as a measure of the lateral packing effects of the hydrocarbon chains. (C) 2004 Elsevier B.V. All rights reserved.