Spectroscopic Studies Of Tubule-Forming Polymerizable Lecithins

A. S. Rudolph; P. E. Schoen; M. Nagumo; F. Behroozi; T. G. Burke; M. E. Ayers; A. Singh; R. Treanor

doi:10.1117/12.951648

8 May 1989 Spectroscopic Studies Of Tubule-Forming Polymerizable Lecithins

A. S. Rudolph, P. E. Schoen, M. Nagumo, F. Behroozi, T. G. Burke, M. E. Ayers, A. Singh, R. Treanor

Proceedings Volume 1057, Biomolecular Spectroscopy; (1989) https://doi.org/10.1117/12.951648
Event: OE/LASE '89, 1989, Los Angeles, CA, United States

Abstract

Polymerizable, diacetylenic lecithins form cylindrical microstructures (tubules) in water at the liquid-crystalline to gel phase transition, or by isothermal crystallization from organic solvents. The mechanism and driving force for the formation of tubules is unknown. Our approach to understanding tubule formation has been to probe conformational order by vibrational and magnetic resonance spectroscopies during the polymorphic phase changes that precede tubule formation. FTIR spectral features and order parameters derived from Raman data both indicate that tubules in excess water show a surprising degree of conformational order in the aryl chains. In addition, low frequency Raman spectra indicate the presence of longitudinal acoustic modes (LAMS) which may be assigned to chain segments above and below the diacetylenic moieties. We are currently examining a number of deuterated analogs of these compounds with FTIR, Raman, and NMR spectroscopies in order to make more definitive assignments of the LAMS, and understand more clearly the order-disorder of particular regions of the chains.

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A. S. Rudolph, P. E. Schoen, M. Nagumo, F. Behroozi, T. G. Burke, M. E. Ayers, A. Singh, and R. Treanor "Spectroscopic Studies Of Tubule-Forming Polymerizable Lecithins", Proc. SPIE 1057, Biomolecular Spectroscopy, (8 May 1989); https://doi.org/10.1117/12.951648

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