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Liquid Crystals Volume 35, 2008 - Issue 2
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Original articles

Rich polymorphism in 4‐propyl‐4′‐thiocyanato‐1,1′‐biphenyl (3TCB) revealed by adiabatic calorimetry

R. Pełka Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305‐8571, Japan; The Henryk Niewodniczański Institute of Nuclear Physics Polish Academy of Sciences, Radzikowskiego 152, Kraków, 31‐342, PolandCorrespondence[email protected]
,
Yasuhisa Yamamura Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305‐8571, Japan
,
M. Jasiurkowska The Henryk Niewodniczański Institute of Nuclear Physics Polish Academy of Sciences, Radzikowskiego 152, Kraków, 31‐342, Poland
,
M. Massalska‐Arodź The Henryk Niewodniczański Institute of Nuclear Physics Polish Academy of Sciences, Radzikowskiego 152, Kraków, 31‐342, Poland
&
Kazuya Saito Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305‐8571, Japan
Pages 179-186 | Received 01 Oct 2007, Accepted 20 Nov 2007, Published online: 02 Apr 2008
 
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Abstract

The thermal behaviour of 4‐propyl‐4′‐thiocyanatobiphenyl (3TCB) was studied by adiabatic calorimetry. In addition to the isotropic liquid and smectic E (SmE) phases, five crystalline phases were detected. Such a rich polymorphism was not observed for the other low‐n members of the nTCB homologous series (n = 2–5). The observed anomalies are analysed and the possible origin for their existence is suggested. The temperature quench of the SmE phase leads to a metastable crystalline state with a multiple‐stage relaxation process.

Acknowledgments

This work was supported by the JSPS Fellowship Program, ID No. P05736. Partial support was obtained from the grant of the Polish Ministry of Science and Higher Education No. 1P03B 60 28.

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