64964-19-8Relevant academic research and scientific papers
Liquid Crystalline Compounds in the Thiophene Series, Part 11. Liquid Crystalline Thiophene Carboxylic Esters
Kossmehl, Gerhard,Hirsch, Barbara
, p. 1265 - 1274 (2007/10/03)
The new series of ten 4,4'-bis(5-alkyl-2-thienylcarbonyloxy)azobenzenes (2a-2j) and ten 2,5-bis(5-alkyl-2-thienylcarbonyloxy)toluenes (3a-3j) were prepared.These, as yet unknown esters were characterized in relation to their structures by elemental analyses, IR, UV, 1H NMR spectra and MS.The azobenzene-esters 2a-2j which form liquid crystalline phases were studied by microscopy under polarized light and DSC (differential scanning calorimetry).Through the observation of the optical textures nematic phases were monitored.Only 2j has an additional smectic phase; 2h and 2i form monotropic smectic phases during cooling.The toluene-esters 3a-3j do not form liquid crystalline phases. - Keywords: Liquid Crystalline Thiophene Derivatives; Thiophene Carboxylic Esters; Mesogenic Groups; Liquid Crystalline Esters; Liquid Crystalline Azobenzene Derivatives
SIDE CHAIN POLYMERS CONTAINING 4-(5-ALKYLATED 2-THIENYLCARBONYLOXY)BENZOIC ACID
Kossmehl, Gerhard,Pithart, Cornelia
, p. 167 - 170 (2007/10/02)
The synthesis of a series of 4-(5-substituted 2-thienylcarbonyloxy)benzoic acid is reported.Their mesomorphic behaviour is investigated by DSC and polarizing microscopy, indicating schlieren textures.Esters of the above compounds with ω-alkenyl substituents are reacted with poly(hydrogenmethylsiloxane) to give alkylated side chain poly(methylsiloxane)s, which are investigated by the same methods.The alkylated poly(methylsiloxane)s with long spacers have schlieren textures.
Liquid Crystalline Compounds in the Thiophene Series. 1. Liquid Crystalline Thiophene Carboxylic Esters
Kossmehl, Gerhard,Budwill, Detlev
, p. 1669 - 1677 (2007/10/02)
Carboxylic esters have been prepared from 5-alkyl-2-thiophenecarboxylic acid and hydrochinone, biphenol, respectively cholesterol as well as one ester from 2,5-thiophene dicarboxylic acid and p-ethylphenol.Only the esters from biphenol respectively cholesterol have liquid crystalline phases. - Keywords: Liquid Crystalline Thiophene Derivatives, Thiophene Carboxylic Esters
