Polymorphism of <i>Para</i>-Dichlorobenzene

Dean, C.; Lindstrand, E.

doi:10.1063/1.1742708

Cited by 18 publications

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References 3 publications

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“…The ?-phase was first reported by Dean & Lindstrand (1956) as a transient low-temperature phase, and later observed (Kushida, Benedek & Bloembergen, 1956) as a stable high-pressure (1600 bar) modification of DCB. Gehlfenstein & Szwarc (1971) investigated the phase diagram of DCB by low-frequency Raman spectroscopy, and reported a sluggish but reversible ~ y phase transition at about -5 °C and atmospheric pressure.…”

Section: Introductionmentioning

confidence: 99%

γ-Phase p-dichlorobenzene at 100 K

Wheeler¹,

Colson²

1975

Acta Crystallogr Sect B

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Abstract. C6H4C12, monoclinic y-phase, P2ffc, a = 8.624(2), b=6.02I (2), c=7.414 (2) A, fl= 127.51 (1)°, Z=2, R = 0.044 for 797 reflections. Crystals of y-DCB were grown from ethanol solution at 250 K and analyzed at 100 K. The benzene ring bond lengths are in good agreement (1.391 + 0.004 A)and the chlorine atoms are displaced 0.045 A from the benzene plane.Introduction. Hexagonal plates suitable for X-ray analysis were obtained from a saturated ethanol solution at -25°C. Evaporation of the solvent was aided by passing a gentle stream of nitrogen over the solvent. To prevent the y -+ e phase transition, the filtering and crystal mounting procedures were performed in a large freezer maintained at -20°C. A specimen 0.3 x 0.3 x 0-1 mm was selected and placed in a quartz capillary which had been previously attached to an Air Products cryo-tip goniometer. After the capillary was sealed and covered with a beryllium vacuum shroud, the cryostat was activated and the goniometer removed from the freezer. Cell dimensions and a total of 890 (797> 3aF) intensity data were determined at 100+ 5K on a Picker FACS-I diffractometer using Mo radiation and a graphite monochromator (2=0.71069 A). The data set included all reflections to 20=55 ° plus

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Section: Introductionmentioning

confidence: 99%