https://doi.org/10.1007/s100510051029
High temperature phase transitions in the crystal of p-trimethylammoniumbenzenesulfonate zwitterion
1
Groupe Matière Condensée et Matériaux (UMR CNRS 6626) ,
Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex, France
2
Institute of Physical and Theoretical Chemistry, Technical University of
Wroclaw, 50-370 Wroclaw, Poland
Received:
21
October
1998
Revised:
14
April
1999
Published online: 13 August 2012
Crystals of p-trimethylammoniumbenzenesulfonate (ZWT) have been obtained from the
thermally induced soli
state reaction of methyl p-dimethylaminobenzenesulfonate
(MSE) or by recrystallization in aqueous solution. The characterization of four
crystalline phases has been performed by calorimetric, birefringence, X-ray and
Raman scattering studies. An unknown phase transition at room temperature yielding
a new crystallographic phase has been found by calorimetric measurements. ZWT
crystalline samples obtained from the 
solid state reaction
are disordered as compared to ZWT single crystals obtained by growing from aqueous
solution. This disorder is related to different arrangements of the phenyl ring
orientations.
PACS: 61.50.Ks – Crystallographic aspects of phase transformations; pressure effects / 61.66.Hq – Organic compounds / 65.40.+g – Heat capacities of solids
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1999
