Symmetrical mesogenic 2,5-bis(6-naphthalen-2-yl)-1,3,4-thiadiazoles

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題名:	Symmetrical mesogenic 2,5-bis(6-naphthalen-2-yl)-1,3,4-thiadiazoles
作者:	賴重光;Kuo, Hsiu-Ming;Li, Sih-Yeh;Sheu, Hwo-Shuenn;Lai, Chung K.
貢獻者:	理學院化學學系
關鍵詞:	chemical reactions;chemical structure;Chemistry;Condensed benzenic and aromatic compounds;Derivatives;differential scanning calorimetry;Diffraction;Exact sciences and technology;Fluorescence;Heterocyclic compounds;Heterocyclic compounds with n hetero atom and also o and/or s, se, te hetero atoms;Kinetics and mechanisms;Linearity;microscopy;Nematic;Optical microscopy;Organic chemistry;organic compounds;oxygen;Phases;photoluminescence;Preparations and properties;Reactivity and mechanisms;Sulfur;temperature;X-radiation
日期:	2012-09-09
上傳時間:	2026-04-21 13:59:13 (UTC+8)
出版者:	Elsevier Ltd.;Kidlington: Elsevier Ltd
摘要:	摘要： Two series of new symmetrical 1,3,4-oxadiazoles 1a-n and 1,3,4-thiadiazoles 1b-n were prepared and their mesomorphic properties investigated by optical microscopy, differential scanning calorimetry, and powder X-ray diffractometry. Compounds 1b-n are kinetically more stable than compounds 1a-n. Compounds 1a-n exhibited monotropic nematic or smectic C phases, whereas, compounds 1b-n exhibited enantiotropic nematic or smectic A/smectic C phases. Compounds 1b-n have higher clearing temperatures and the larger temperature ranges of mesophases, which might be attributed to the better linearity and/or larger dipole, resulted from a more polarized sulfur atom than oxygen atom incorporated. The fluorescent properties of these two series of 1,3,4-thiadiazole/oxadiazole-based derivatives were also examined. The λmax peaks of the photoluminescence spectra for compounds 1a-6 and 1b-6 measured in THF occurred at ca. 385nm and 423nm, respectively. Both series were blue emitters. [Display omitted] 出版者： Kidlington: Elsevier Ltd 出版日期： 2012-09-09 出處： Tetrahedron, 2012-09, Vol.68 (36), p.7331-7337 版權： 2012 Elsevier Ltd 版權： 2015 INIST-CNRS 識別號： ISSN: 0040-4020 識別號： EISSN: 1464-5416 識別號： DOI: 10.1016/j.tet.2012.06.092 識別號： CODEN: TETRAB
顯示於類別:	[化學學系] 期刊論文

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