CRYSTALLINE, SMECTIC-C, CUBIC, ISOTROPIC, NEMATIC, ISOTROPIC POLYMORPHISM - SYNTHESIS AND UNEXPECTED BEHAVIOR OF A NEW SERIES OF DOUBLE-SWALLOW-TAILED MESOGENS

Authors
WEISSFLOG W PELZL G LETKO I DIELE S
Citation
W. Weissflog et al., CRYSTALLINE, SMECTIC-C, CUBIC, ISOTROPIC, NEMATIC, ISOTROPIC POLYMORPHISM - SYNTHESIS AND UNEXPECTED BEHAVIOR OF A NEW SERIES OF DOUBLE-SWALLOW-TAILED MESOGENS, Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals, 260, 1995, pp. 157
Citations number
19
Categorie Soggetti
Crystallography
Journal title
Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals → ACNP
ISSN journal
1058725X
Volume
260
Year of publication
1995
Database
ISI
SICI code
1058-725X(1995)260:<157:CSCINI>2.0.ZU;2-6
Abstract
A new homologous series of six-ring double-swallow-tailed mesogens was prepared and investigated. Liquid-crystalline properties strongly dep end on the length of the terminal alkyl chains. Six different phase se quences could be detected, two of them were unknown up to now. The der ivatives DS-5...7 show smectic C, cubic and nematic phases, the longer -chain homologues DS-10...14, 16 have columnar phases. The substance D S-8 exhibits the most interesting phase sequence cr - S-C - cub - I-re - N - I. DS-8 represents the second pure compound with a stable reent rant isotropic phase. Optical, X-ray, and further investigations provi de arguments to propose the structures of the different phases.