标题：Synthesis, X-ray crystal structure and optical properties of novel 5-(3-aryl-1H-pyrazol-5-yl)-2-(6-methoxy-3-methylbenzofuran-2-yl)-1,3,4-o xadiazole
作者：Jiang, Zhen-Ju; Liu, Jin-Ting; Lv, Hong-Shui; Zhao, Bao-Xiang
作者机构：[Jiang, Zhen-Ju; Liu, Jin-Ting; Lv, Hong-Shui; Zhao, Bao-Xiang] Shandong Univ, Inst Organ Chem, Sch Chem & Chem Engn, Jinan 250100, Peoples R China.
通讯作者地址：[Liu, JT]Shandong Univ, Inst Organ Chem, Sch Chem & Chem Engn, Jinan 250100, Peoples R China.
来源：SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
关键词：1,3,4-Oxadiazole; Pyrazole; Benzofuran; Synthesis; UV absorption;; Fluorescence
摘要：A series of novel 5-(3-aryl-1H-pyrazol-5-yl)-2-(6-methoxy-3-methylbenzofuran-2-yl)-1,3,4-oxadiazole derivatives has been synthesized from 6-methoxy-3-methylbenzofuran-2-carboxylic acid and ethyl 3-aryl-1H-pyrazole-5-carboxylate. The structures of compounds obtained were determined by IR, H-1 NMR and HRMS spectra. Typically, the spatial structure of compound 7e was determined by using X-ray diffraction analysis. UV-vis absorption and fluorescence spectral characteristics of the compounds in dichloromethane and acetonitrile were investigated. The results showed that the absorption maxima of the compounds vary from 321 to 339 nm depending on the substituents in N-1 position of pyrazole moiety and para position of benzene moiety. The maximum emission spectra of compounds in two different solvents were mainly dependent on groups in N-1 position of pyrazole moiety. The intensity of absorption and fluorescence was also correlated with substituents on the aryl ring bonded to pyrazole moiety. In addition, the absorption and emission spectra of these compounds change with increasing solvent polarity. (C) 2011 Elsevier B.V. All rights reserved.