Unsymmetric 1,3,4-oxa(thia)diazoles of quinoxaline-naphthalene conjugates

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題名:	Unsymmetric 1,3,4-oxa(thia)diazoles of quinoxaline-naphthalene conjugates
作者:	賴重光;Lin, Kuan-Ting;Kuo, Hsiu-Ming;Sheu, Hwo-Shuenn;Lai, Chung K.
貢獻者:	理學院化學學系
關鍵詞:	1,3,4-Oxadiazoles;1,3,4-Thiadiazoles;chemical reactions;chemical structure;emissions;Hexagonal columnar phases;Liquid crystals;microscopy;naphthalene;Naphthalenes;photoluminescence;Quinoxalines;X-ray diffraction
日期:	2013-10-28
上傳時間:	2026-04-21 14:15:00 (UTC+8)
出版者:	Elsevier Ltd.;Elsevier Ltd
摘要:	摘要： Two new series of unsymmetric 1,3,4-oxa(thia)diazoles 1a,b containing both quinoxaline and naphthalene moieties were prepared and their mesomorphic properties were investigated. The mesomorphic behavior of compounds 1a,b and 2 was studied by DSC analysis and polarized optical microscopy. All compounds 1a and 2 exhibited hexagonal columnar phases (Colh), which were also confirmed by powder XRD diffractometer. Ncell and Rar values equal to 5.23 and 22.73 Å2 within a slice of 9.0 Å thick were also obtained for 1a (n=16), indicating that a more disc-like structure constructed by two molecules lying side-by-side was correlated in Colh phases. In contrast, all compounds 1b were not mesogenic, and the lack of mesomorphic properties in 1b might be due to their unfavorable conformations. The PL spectra of all compounds 1a,b showed one intense peak at λmax=509–512 nm, and these photoluminescent emissions originated from quinoxaline moiety. [Display omitted] 出版者： Elsevier Ltd 出版日期： 2013-10-28 出處： Tetrahedron, 2013-10, Vol.69 (43), p.9045-9055 版權： 2013 Elsevier Ltd 識別號： ISSN: 0040-4020 識別號： EISSN: 1464-5416 識別號： DOI: 10.1016/j.tet.2013.08.031
顯示於類別:	[化學學系] 期刊論文

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