Hydrogen-bond-assisted supramolecular 1-D tape-like structures of mesogenic bis-pyrazoles

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/100324

Title:	Hydrogen-bond-assisted supramolecular 1-D tape-like structures of mesogenic bis-pyrazoles
Authors:	賴重光;Lin, Huei-Yun;Kuo, Hsiu-Ming;Wen, Shao-Gang;Sheu, Hwo-Shuenn;Lee, Gene-Hsiang;Lai, Chung K.
Contributors:	理學院化學學系
Keywords:	chemical reactions;chemical structure;Chemistry;Cross-disciplinary physics: materials science;rheology;Exact sciences and technology;Heterocyclic compounds;Heterocyclic compounds with several n hetero atoms in the same ring, in separated rings or in fused rings;hydrazine;hydrogen bonding;Materials science;Methods of nanofabrication;Organic chemistry;Physics;Preparations and properties;Supramolecular and biochemical assembly;X-radiation
Date:	2012-08-05
Issue Date:	2026-04-21 13:57:36 (UTC+8)
Publisher:	Elsevier Ltd.;Kidlington: Elsevier Ltd
Abstract:	摘要： Two new series of isomeric bis-pyrazoles 1a–b are prepared, characterized, and their mesomorphic properties investigated. These pyrazoyl derivatives were obtained from the condensation of α,β-diketones 2a–b with hydrazine monohydrate in refluxing THF. Two single crystallographic structures of compounds mesogenic 1a (n=14) and nonmesogenic 1b (n=8) were determined by X-ray analysis. Both 1a–14 and 1b–8 crystallize in a triclinic space group P−1 and monoclinic C2/c group, respectively. An extended H-bonded structure was formed in both crystal lattices, giving a pseudo 1D-polymeric tape-like structure. Derivatives 1a exhibited smectic A/C mesophases, in contrast, derivatives 1b were all nonmesogenic. The difference in mesomorphic behavior was attributed to the between linear conformation and the coplanarity of the five rings over than in 1a. The correlation between the molecular structures and the mesomorphic properties is discussed. [Display omitted] 出版者： Kidlington: Elsevier Ltd 出版日期： 2012-08-05 出處： Tetrahedron, 2012-08, Vol.68 (31), p.6231-6239 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.2012.05.060 識別號： CODEN: TETRAB
Appears in Collections:	[Department of Chemistry] journal & Dissertation

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