2159-25-3Relevant articles and documents
DEUTERON NMR STUDY OF MOLECULAR MOBILITY IN A POLYMER MODEL MEMBRANE.
Ebelhaeuser,Spiess
, p. 1208 - 1214 (2007/10/02)
The molecular mobility of a polymer model membrane is studied by **2H NMR. The lipid analogue consists of a quaternary ammonium ion, to which a methacryloylic moiety is attached via a spacer to the hydrophilic head group. A methylene group of the spacer, the methyl-head group and methylene groups in the 1-, 2-, and 7-position of the lipid chains are selectively deuterated. Temperature dependent **2H NMR spectra are reported for both, the monomer and the polymer membrane below and above the main phase transition. The data are quantitatively analyzed in terms of a simple motional model, in which the complex molecular dynamics is approximated by a six-site jump model describing rotations about the long axis of the molecule and conformational changes. The increasing mobility with increasing temperature is only in part due to an increase of the jump rate between different sites.