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• W1981463669 abstract "Abstract A class of extended 2,5‐disubstituted‐1,3,4‐oxadiazoles R 1 ‐C 6 H 4 ‐{OC 2 N 2 }‐C 6 H 4 ‐R 2 (R 1 =R 2 =C 10 H 21 O 1 a , p ‐C 10 H 21 O‐C 6 H 4 ‐CC 3 a , p ‐CH 3 O‐C 6 H 4 ‐CC 3 b ; R 1 =C 10 H 21 O, R 2 =CH 3 O 1 b , (CH 3 ) 2 N 1 c ; F 1 d ; R 1 =C 10 H 21 O‐C 6 H 4 ‐CC, R 2 =C 10 H 21 O 2 a , CH 3 O 2 b , (CH 3 ) 2 N 2 c , F 2 d ) were prepared, and their liquid‐crystalline properties were examined. In CH 2 Cl 2 solution, these compounds displayed a room‐temperature emission with λ max at 340 – 471 nm and quantum yields of 0.73 – 0.97. Compounds 1 d , 2 a – 2 d , and 3 a exhibited various thermotropic mesophases (monotropic, enantiotropic nematic/smectic), which were examined by polarized‐light optical microscopy and differential scanning calorimetry. Structure determination by a direct‐space approach using simulated annealing or parallel tempering of the powder X‐ray diffraction data revealed distinctive crystal‐packing arrangements for mesogenic molecules 2 b and 3 a , leading to different nematic mesophase behavior, with 2 b being monotropic and 3 a enantiotropic in the narrow temperature range of 200 – 210 °C. The structural transitions associated with these crystalline solids and their mesophases were studied by variable‐temperature X‐ray diffractometry. Nondestructive phase transitions (crystal‐to‐crystal, crystal‐to‐mesophase, mesophase‐to‐liquid) were observed in the diffractograms of 1 b, 1 d , 2 b, 2 d , and 3 a measured at 25 – 200 °C. Powder X‐ray diffraction and small‐angle X‐ray scattering data revealed that the structure of the annealed solid residue 2 b reverted to its original crystal/molecular packing when the isotropic liquid was cooled to room temperature. Structure–property relationships within these mesomorphic solids are discussed in the context of their molecular structures and intermolecular interactions." @default.
• W1981463669 created "2016-06-24" @default.
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• W1981463669 date "2006-12-07" @default.
• W1981463669 modified "2023-10-17" @default.
• W1981463669 title "Thermotropic Liquid Crystals Based on Extended 2,5-Disubstituted-1,3,4-Oxadiazoles: Structure–Property Relationships, Variable-Temperature Powder X-ray Diffraction, and Small-Angle X-ray Scattering Studies" @default.
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• W1981463669 doi "https://doi.org/10.1002/asia.200600252" @default.
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