Phase crossover in columnar tris-(1,3,4-oxadiazoles) with pendant quinoxalines

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/101720

Title:	Phase crossover in columnar tris-(1,3,4-oxadiazoles) with pendant quinoxalines
Authors:	賴重光;Lin, Kuan-Ting;Lai, Chung K.
Contributors:	理學院化學學系
Keywords:	Bis-(1,3,4-oxadiazoles);chemical reactions;chemical structure;Columnar phases;emissions;Phase crossover;photoluminescence;Quinoxalines;temperature;thermogravimetry;Tris-(1,3,4-oxadiazoles);X-ray diffraction
Date:	2016-01-01
Issue Date:	2026-04-21 14:41:38 (UTC+8)
Publisher:	Elsevier Ltd.;Elsevier Ltd
Abstract:	摘要： Four new series of bis-(1,3,4-oxadiazoles) 1a–c and tris-(1,3,4-oxadiazoles) 1d containing peripheral quinoxalines were prepared and their mesomorphic behavior was reported. Except for compound 1c (n=12), all other compounds 1a–d formed columnar phases which were confirmed by powder X-ray diffractometer (XRD). Compounds 1d have the highest clearing temperatures and the widest temperature range of columnar phases than those of other compounds 1a–b. Compounds 1d exhibited a phase crossover between the rectangular and hexagonal columnar phases. A value of Ncell=2.85 and 2.16 Å within a column slice of 9.0 Å thick was obtained for compound 1a (n=12) and 1d (n=12), indicating that two molecule was correlated within columns in columnar phases. All compounds 1a–d (n=12) showed good stabilities at temperature below Tdec=412.5–420.8 °C on thermogravimetric analysis. The PL spectra of all compounds 1a–d (n=12) showed one intense peak at λmax=517–520 nm, and these photoluminescent emissions originated from peripheral quinoxaline moiety. [Display omitted] 出版者： Elsevier Ltd 出版日期： 2016-11-24 出處： Tetrahedron, 2016-11, Vol.72 (47), p.7579-7588 版權： 2016 Elsevier Ltd 識別號： ISSN: 0040-4020 識別號： EISSN: 1464-5416 識別號： DOI: 10.1016/j.tet.2016.10.003
Appears in Collections:	[Department of Chemistry] journal & Dissertation

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