The molecular conformation of N-( 1 -octyl)-D-gluconamide in its helical micellar fibers is determined. The all-anti conformation in three-dimensional crystals and the 4G+ conformation in D M S O solution served as references. Comparisons of 13C C P / M A S solid-state NMR spectra of head-to-tail and tail-to-tail oriented crystals led to a zG-conformation for the gluconamide head groups and an all-anti conformation for the alkyl chains in the fibers. The latter result is confirmed by powder X-ray diffraction data and infrared spectra.Modeling of the micellar rod shows that there must be a gap of about 0.8-nm diameter in the center, probably in the form of a tunnel. A short discussion of other cylindrical bilayer crystals is given.
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