Ab initio structure determination of sulfathiazole polymorph V from synchrotron X-ray powder diffraction data

被引:49
作者
Chan, FC
Anwar, J
Cernik, R
Barnes, P
Wilson, RM
机构
[1] Kings Coll London, Dept Pharm, Computat Pharmaceut Sci Lab, London SW3 6LX, England
[2] CLRC, Daresbury Lab, Warrington WA4 4AD, Cheshire, England
[3] Univ London Birkbeck Coll, Dept Crystallog, London WC1E 7HX, England
[4] Queen Mary Univ London, Dept Dent Biophys, London E1 4NS, England
关键词
D O I
10.1107/S0021889898017233
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The crystal structure of sulfathiazole [4-amino-N-(2,3-dihydro-2-thiazolylidene)benzenesulfonamide, C9H9-N3O2S] polymorphic form V has been determined from high-resolution synchrotron X-ray powder diffraction data. The structure is monoclinic, space group P2(1)/in, Z = 8, with two molecules in the asymmetric unit. The unit-cell dimensions are a = 14.3296(3), b = 15.2733 (2), c = 10.4428 (2) Angstrom and beta = 91.052 (1)degrees with cell volume V = 2285.13 (8) Angstrom(3). The structure has been solved by direct methods without recourse to any computational modelling techniques for generating possible structures. The unrefined structure obtained from direct methods gave an R-wp value of 36.5%. Refinement of atomic and displacement parameters yielded a final R-wp of 12.54% (R-p = 9.37%). The conformations of the two molecules in the asymmetric unit are nearly identical and very similar to that found in other forms of sulfathiazole. The molecular packing is characterized by molecular sheets lying perpendicular to the a axis. Each sheet is two molecules thick, being integrated by hydrogen bonding. With 16 non-H atoms in the molecule and two molecules in the asymmetric unit, this structure represents a further advance in terms of the complexity of an organic structure solved from X-ray powder diffraction data.
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页码:436 / 441
页数:6
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