Transverse acoustic modes of biogenic and alpha,omega-polyamines: a study by inelastic neutron scattering and Raman spectroscopies coupled to DFT calculations |
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Authors: | Batista de Carvalho Luís A E Marques M Paula M Tomkinson John |
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Institution: | Research Unit "Molecular Physical-Chemistry", University of Coimbra, 3000-401 Coimbra, Portugal. |
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Abstract: | A complete analysis of the transverse acoustic modes (TAMs) for the homologous series of alpha,omega-diamines (H2N(CH2)nNH2) (n = 2-10, n = 12) as well as for the biogenic polyamines spermidine and spermine was undertaken, by Raman and inelastic neutron scattering (INS) spectroscopies combined with density functional theory (DFT) calculations. A complete assignment of the whole set of TAMs was carried out, for both the undeuterated and N-deuterated species. 1,2-Diaminoethane was found to display exceptional behavior, probably due to the formation of dimers in the solid state. An n-even/n-odd dependence of the low frequency INS pattern was observed for these polyamines. The very good accordance between their INS experimental TAMs and the ones previously reported for the corresponding n-alkanes suggest a close conformational similarity between these systems. |
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