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Molecular Crystals and Liquid Crystals Volume 195, 1991 - Issue 1
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Liquid Crystal

An X-Ray Study of Cyanophenylpyrimidines Part III. Crystal Structure of 5-(trans-4- Heptylcyclohexyl)-2-(4-Cyanophenyl) Pyrimidine

S. Gupta Physics Department, North Bengal University, Siliguri, India
,
P. Mandal Physics Department, North Bengal University, Siliguri, India
,
S. Paul Physics Department, North Bengal University, Siliguri, India
,
M. de Wit Laboratory for Crystallography, University of Amsterdam, 1018, Amsterdam, WV
,
K. Goubitz Laboratory for Crystallography, University of Amsterdam, 1018, Amsterdam, WV
&
H. Schenk Laboratory for Crystallography, University of Amsterdam, 1018, Amsterdam, WV
Pages 149-159 | Received 28 Jun 1990, Published online: 24 Sep 2006
 
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Abstract

The compound C24H31N3 at higher temperatures shows a smectic liquid crystal phase followed by a nematic phase. The crystals belong to space group P21/c, with a = 13.0422(6), b = 17.7464(11) and c = 9.5950(5) Å, β = 107.170(1)°, Z = 4. The structure has been solved by the direct method program system SIMPEL83 and refined to an R-value of 0.041. Molecules are packed in associated pairs running parallel to the a axis. An X-ray study at higher temperatures shows that the smectic phase is also built ap from similar pairs of molecules.

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