223654-79-3Relevant academic research and scientific papers
Molecular design of nonchiral bent-core liquid crystals with antiferroelectric properties
Shen, Dong,Pegenau, Annegret,Diele, Siegmar,Wirth, Ina,Tschierske, Carsten
, p. 1593 - 1601 (2007/10/03)
Novel bent-core (banana-shaped) liquid crystals without Schiff-base units have been synthesized and investigated by polarized light optical microscopy, differential scanning calorimetry, X-ray scattering, and electrooptical investigations. These molecules are 4-(4- alkylbenzoyloxy)benzoates and 4-(4-alkoxybenzoyloxy)benzoates of resorcinol, 3,4'-dihydroxybiphenyl, and 4,4'-dihydroxy- 1,1':3', 1'-terphenyl. Three different mesophases were found depending on the molecular structure and the length of the terminal alkyl chains: a rectangular columnar phase, a highly ordered low-temperature mesophase, and an antiferroelectric switchable fluid smectic mesophase designated as SmCP(A). The influence of the molecular structure on the occurrence of the SmCP(A) phase was investigated. The spontaneous polarization of these molecules is quite high (P(s) = 500700 nC cm-2) and specially those molecules with long alkyl chains and short bent- core structures have low melting points and broad regions of this switchable mesophase. Furthermore, first examples of antiferroelectric switchable bent- core molecules with semifluorinated terminal chains will be described.
Designing banana-shaped liquid crystals without Schiff's base units: m- Terphenyls, 2,6-diphenylpyridines and V-shaped tolane derivatives
Shen, Dong,Diele, Siegmar,Pelzl, Gerhard,Wirth, Ina,Tschierske, Carsten
, p. 661 - 672 (2007/10/03)
This paper reports attempts to obtain (anti)ferroelectric switchable achiral banana-shaped molecules without Schiff's base units. For this purpose we have synthesized novel V-shaped molecules consisting of rigid angular central units [1,3-disubstituted be
