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Proceedings Paper

Spectroscopic Studies Of Tubule-Forming Polymerizable Lecithins
Author(s): A. S. Rudolph; P. E. Schoen; M. Nagumo; F. Behroozi; T. G. Burke; M. E. Ayers; A. Singh; R. Treanor
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Paper 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.

Paper Details

Date Published: 8 May 1989
PDF: 7 pages
Proc. SPIE 1057, Biomolecular Spectroscopy, (8 May 1989); doi: 10.1117/12.951648
Show Author Affiliations
A. S. Rudolph, Naval Research Laboratory (United States)
P. E. Schoen, Naval Research Laboratory (United States)
M. Nagumo, Naval Research Laboratory (United States)
F. Behroozi, Naval Research Laboratory (United States)
T. G. Burke, Geo-Centers Inc. (United States)
M. E. Ayers, Geo-Centers Inc. (United States)
A. Singh, Naval Research Laboratory (United States)
R. Treanor, Naval Research Laboratory (United States)

Published in SPIE Proceedings Vol. 1057:
Biomolecular Spectroscopy
Robert R. Birge; Henry H. Mantsch, Editor(s)

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