Polymorphisme du tetrachloro-1,2,4,5 benzene et du tetrabromo-1,2,4,5 benzene |
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Authors: | D. Mondieig M. A. Cuevas-Diarte Y. Haget |
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Affiliation: | (1) Laboratoire de Cristallographie et de Physique Cristalline, Universite de Bordeaux I, UA 144, France;(2) Departament de Cristallografia, Universitat de Barcelona, Spain |
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Abstract: | Combination of three techniques of thermal analysis (hot stage polarising microscope, DSC, Guinier-Lenne) enabled the determination of the polymorphic behaviour of tetra 1,2,4,5-X benzene (X=Cl, Br). Thermal, calorimetric and crystallographic characterizations have been carried out. This study puts forward an interesting problem: theβ phase (P21/a, stable at room temperature) of the tetra chlorobenzene has similar arrangement to the two solid piases P21/a of tetra bromobenzene. Which one of these two forms is actually isomorphic with tetra chlorobenzene. |
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