147222-99-9Relevant articles and documents
Ferro-, ferri- and antiferro-electric behaviour in a bent-shaped mesogen
Matharu, Avtar S.,Grover, Chrissie,Komitov, Lachezar,Andersson, Gunnar
, p. 1303 - 1310 (2000)
The synthesis of a novel bent-shaped, four-ring thiophene-based chiral liquid crystalline ester derived from 5-(4-n-decyloxyphenyl)thiophene-2- carboxylic acid and (S)-1-methylheptyl 4'-hydroxybiphenyl-4-carboxylate is reported, i.e., (S)-4'-(1-methylheptyloxycarbonyl)biphenyl-4-yl 5-(4-n- decyloxyphenyl)thiophene-2-carboxylate. Optical microscopy, differential scanning calorimetry, miscibility study, and complementary electro-optical and current response studies reveal the existence of the SmA*, SmC* ferroelectric, SmC* ferrielectric, SmC* antiferroelectric and SmI* antiferroelectric phase types. Another mesophase type possibly exists below SmI* antiferroelectric which generates a rapid electro-optic response. Comparison with the analogous three-ring compound, i.e., (S)-4-(1- methylheptyloxycarbonyl)phenyl 5-(4-n-decyloxyphenyl)thiophene-2-carboxylate increases the thermal stability by 95.8 °C and the SmI* antiferroelectric phase is observed in addition.
New pyridine based liquid crystalline esters with different terminal chains
Karanl?k, Gürkan,Ocak, Hale,Bilgin Eran, Belk?z
, (2019/08/22)
The synthesis, structural and mesomorphic characterization of new pyridine-based methyl esters carrying a n-alkoxy chain or 3,7-Dimethyloctyloxy branched group at terminal have been presented. The liquid crystalline properties of the new pyridine-based calamitic molecules have been investigated by polarized optical microscopy and differential scanning calorimetry. New compounds exhibit enantiotropic smectic A mesophase at a variable mesomorphic range depending on alkoxy chain length and branching at terminal. The presence of a branched terminal group in chiral or racemic form gives rise to a sharply increase in mesomorphic range as well as decrease in crystallization points by preserving mesophase type.
Arylation of chloroanthraquinones by surprisingly facile Suzuki-Miyaura cross-coupling reactions
Thiemann, Thies,Tanaka, Yasuko,Iniesta, Jesus,Varghese, H. Tresa,Pannicker, C. Yohannan
experimental part, p. 732 - 736 (2010/03/24)
Chloroanthraquinones were found to undergo facile Suzuki-cross coupling with substituted phenyl boronic acids using a commercial catalyst Pd(PPh 3)4 and with Pd(PPh3)4 prepared in situ from Pd(PPh3)2Cl2 and PPh3.