Phase transition in C8H20IN. 2CH4N2S

The crystal of the title compound undergoes a phase transition at 288K. Structure determinations were made at 296K and 153K. The structure at room temperature belongs to orthorhombic system with the space group Ibca; the low temperature phase is orthorhombic Pccb. Both phase are centric and Z=8. Lar...

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Bibliographic Details
Published in:Ferroelectrics 2001-01, Vol.261 (1), p.257-262
Main Authors: Ishigami, Haruhisa, Tsunashima, Yutaka, Sumita, Minoru, Hikita, Tomoyuki, Sato, Shoichi
Format: Article
Language:English
Subjects:
2CH
phase transition
space group
X-ray diffraction
Online Access:Get full text
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Summary:The crystal of the title compound undergoes a phase transition at 288K. Structure determinations were made at 296K and 153K. The structure at room temperature belongs to orthorhombic system with the space group Ibca; the low temperature phase is orthorhombic Pccb. Both phase are centric and Z=8. Large differences of the cell dimensions were not found between both phases. The structure consists of the tetraethylammonium cations, iodide anions and thiourea molecules. No short contacts other than van der Waals ones are observed. The main difference between both structures is that the cations show a disordered arrangement at room temperature whereas they are ordered in the low-temperature phase. The disordered cation statistically occupies two sites relating the two-fold rotation axis with one-half occupancies each.
ISSN:0015-0193
1563-5112
DOI:10.1080/00150190108216294