Rambaud, J.
Declercq, Jean-Paul
[UCL]
Bouassab, A.
Pauvert, B.
Chevallet, P.
Terol, A.
The crystal structure of polymorph I of p(1R,3S)3-thioanisoyl-1,2,2-trimethylcyclopentane carboxylic acid has been determined and is compared with that of polymorph II that was previously described. Polymorph I is very different at the level of the carboxyl group. It does not present disorder and the values found for the C-O bonds correspond exactly to single and double bond lengths. In addition, the carboxyl groups of the two molecules in the cell packing are involved in symmetric hydrogen bonds [2.662(6) Angstrom] leading to the formation of a dimer around the twofold axis following x with a shift on z. The different conformations on the carboxylic group between the two polymorphs are in good agreement with the thermodynamic study.
Bibliographic reference |
Rambaud, J. ; Declercq, Jean-Paul ; Bouassab, A. ; Pauvert, B. ; Chevallet, P. ; et. al. Comparative-study of the 2 Polymorphic Forms of P(1r,3s) 3-thioanisoyl-1,2,2-trimethylcyclopentane Carboxylic-acid. In: Journal of Pharmaceutical Sciences, Vol. 82, no. 12, p. 1262-1265 (1993) |
Permanent URL |
http://hdl.handle.net/2078.1/49407 |