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Low-temperature crystal structure of RS-thiocamphor
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E. Louise R. Robins
Published/Copyright:
September 25, 2009
Abstract
DSC and high-resolution powder X-ray diffraction measurements in the range 295 K–100 K show that RS-thiocamphor undergoes two phase transitions. The first, at around 260 K on cooling, is from the room-temperature body-centred-cubic phase to a short-lived intermediate. At 258 K the low-temperature form starts to appear. The crystal structure of the latter is orthorhombic, space group Pbnm, with a = 9.0643(4) Å, b = 14.6714(8) Å, c = 7.2878(4) Å, Z = 4, ρcalc = 1.15 g cm–3 at 100 K. The structure is two-fold disordered, with the enantiomers superimposed in the average structure, related by the mirror plane.
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Published Online: 2009-9-25
Published in Print: 2004-9-1
© 2004 Oldenbourg Wissenschaftsverlag GmbH
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- High-pressure in-situ crystallization, structure and phase transitions in 1,2-dichloroethane
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