Methane­sulfonic acid salt forms of carbamazepine and 10,11-di­hydro­carbamazepine

Methane­sulfonic acid salt forms of carbamazepine and 10,11-di­hydro­carbamazepine have been prepared and characterized by a number of analytical techniques, including single-crystal X-ray diffraction at 100 K. The structural data for these complexes were analysed in relation to data derived from other carbamazepine complexes and a redetermination of the apparently anomalous tri­fluoro­acetic acid solvate structure was undertaken.