Columnar catenar bisoxazoles and bisthiazoles

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/101273

Title:	Columnar catenar bisoxazoles and bisthiazoles
Authors:	賴重光;Lin, Kuan-Ting;Kuo, Hsiu-Ming;Sheu, Hwo-Shuenn;Lai, Chung K.
Contributors:	理學院化學學系
Keywords:	azoles;Bisoxazoles;Bisthiazoles;Catenar;chemical reactions;chemical structure;Columnar;Derivatives;Diffractometers;emissions;Liquid crystals;Mesogens;Molecular packing;Phases;Photoluminescence;Spectral emissivity;Stability;temperature;Tetrahedrons;X-ray diffraction
Date:	2014-09-16
Issue Date:	2026-04-21 14:29:03 (UTC+8)
Publisher:	Elsevier Ltd.;Elsevier Ltd
Abstract:	摘要： Three new series of catenar liquid crystals 1a–c derived from heterocyclic bisoxazoles and bisthiazoles exhibiting columnar phases were reported. All compounds 1a–c exhibited hexagonal columnar phases, which were confirmed by powder XRD diffractometer. Compounds 1a have a slightly wider temperature range of columnar phases than that of compounds 1b, which might be attributed to higher dipole polarized in 1a. A Ncell and Rar value equal to 2.54–2.76 and 19.99–20.45 Å2 within a slice of 9.0 Å thick were obtained for three derivatives 1a–c (all ns=12), indicating that a single molecule was packed within columns in Colh phases. All derivatives showed good stabilities at temperature below T=408 °C on TGA. The PL spectra of all compounds 1a–c showed one intense peak at λmax=505–510 nm, and these photoluminescent emissions originated from quinoxaline moiety. [Display omitted] 出版者： Elsevier Ltd 出版日期： 2014-09-16 出處： Tetrahedron, 2014-09, Vol.70 (37), p.6457-6466 版權： 2014 Elsevier Ltd 識別號： ISSN: 0040-4020 識別號： EISSN: 1464-5416 識別號： DOI: 10.1016/j.tet.2014.07.021
Appears in Collections:	[Department of Chemistry] journal & Dissertation

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