Binary system between chlorobenzene and hexafluorobenzene: Phase diagram and molecular complex

Alain Marbeuf (1) , Denise Mondieig (1) , V. Metivaud (1) , Philippe Négrier (1) , Miquel àngel Cuevas-Diarte (2) , Y. Haget (1)

1 CPMOH - Centre de physique moléculaire optique et hertzienne
2 Departament de Cristal·lografia

Equilibrium phase diagram of the chlorobenzene-hexafluorobenzene binary system is experimentally determined by differential scanning calorimetry and X-ray diffraction analyses. This diagram is of the double eutectic type with a 1:1 crystalline molecular complex. The optimization of the complex thermodynamic quantities (melting temperature, melting enthalpy and first order polymorphic transition temperature) is carried out from the experimental data. The positive excess enthalpy of the melt resulting from repulsive interactions between C6H5Cl and C6F6 molecules is related to the low stability of the complex lattice.

Mots clés: differential scanning calorimetry; Molecular complexes; X-ray diffraction; thermal analysis

Domaines: Physique [physics]; Cristallographie

Alain Marbeuf, Denise Mondieig, V. Metivaud, Philippe Négrier, Miquel àngel Cuevas-Diarte, et al.. Binary system between chlorobenzene and hexafluorobenzene: Phase diagram and molecular complex. Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, 1997, 293 (1), pp.309-323. ⟨10.1080/10587259708042779⟩. ⟨hal-01550140⟩