HEAT CAPACITY AND THERMODYNAMIC PROPERTIES OF P prime -SUBSTITUTED p-n-HEXYLOXYBENZLIDENEANILINES 2. p-n-HEXYLOXYBENZYLIDENEAMINO-p prime -CHLOROBENZENE (HBAC).

Article abstract of DOI:10.1080/00268948208084448

The heat capacity of the smectic liquid crystal, HBAC, were measured from 15 K to 385 K by using an adiabatic calorimeter. Contrary to the previous experimental results on p-n-hexyloxybenzylideneamino-p prime -benzonitrile (HBAB), no solid-solid phase transition was observed in HBAC. However, a new intermediate phase was discovered between the crystal and the smectic B phase. Four phase transitions were found at 327. 7 K (crystal-intermediate phase S//3), 330. 90 K (S//3-smectic B), 362. 98 K (smectic B-smectic A), and 370. 38 K (smectic A-isotropic liquid), respectively. The enthalpies and entropies of these transitions were determined to be 10. 88 kJmol** minus **1/33. 2 JK** minus **1, 12. 35/37. 0, 3. 39/9. 3 and 5. 79/15. 6 respectively. The standard thermodynamic functions have also been estimated up to 385 K. The total sum of four transition entropies amounts to 95. 1 JK** minus **1mol** minus **1 and agrees well with that of three transitions from the crystal II to the isotropic liquid of HBAB.

Full text of DOI:10.1080/00268948208084448

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Heat Capacity and
Thermodynamic Properties
of p′-Substituted p-n-
Hexyloxybenzylideneanilines II.
p-n-Hexyloxybenzylidenamino-
p′-Chlorobenzene (HBAC)
a b
a
a
Kazuhiro Tsuji
, Michio Sorai , Hiroshi Suga &
a
SyÛzô Seki
a
Department of Chemistry, Faculty of Science ,
Osaka University , Toyonaka, Oskaa, 560, Japan
b
Departemnt of Chemistry , School of Science,
Kwansei Gakuin University , Nisthinomiya, 662,
Japan
Published online: 28 Mar 2007.
To cite this article: Kazuhiro Tsuji , Michio Sorai , Hiroshi Suga & SyÛzô Seki
(
1982) Heat Capacity and Thermodynamic Properties of p′-Substituted p-n-
Hexyloxybenzylideneanilines II. p-n-Hexyloxybenzylidenamino-p′-Chlorobenzene
HBAC), Molecular Crystals and Liquid Crystals, 87:3-4, 293-304, DOI:
0.1080/00268948208084448
(
1
To link to this article: http://dx.doi.org/10.1080/00268948208084448
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