title: The synthesis, characterization and optical properties of novel 5-(3-aryl-1H-pyrazol-5-yl)-2-(3-butyl-1-chloroimidazo[1,5-a]pyridin-7-yl)-1,3,4-oxadiazole.
abstract: A series of novel 5-(3-aryl-1H-pyrazol-5-yl)-2-(3-butyl-1-chloroimidazo[1,5-a]- pyridin-7-yl)-1,3,4-oxadiazole derivatives has been synthesized from 3-butyl-1-chloroimidazo[1,5-a]pyridine-7-carboxylic acid and ethyl 3-aryl-1H-pyrazole-5-carboxylate. The compounds were characterized using IR, (1)H NMR, HRMS and UV-vis absorption. The fluorescence spectral characteristics of the compounds in dichloromethane were investigated. The results showed that absorption λmax and emission λmax was less correlated with substituent groups on N-1 position of pyrazole moiety and para position of benzene moiety. The calculated molecular orbital correlates well with their absorption.
authors.affiliation: School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong 250100, PR China; School of Chemical Engineering, Taishan Medical University, Taian, Shandong 271016, PR China.
authors.forename: Yan Qing
authors.initials: YQ
authors.lastname: Ge
authors.affiliation: School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong 250100, PR China.
authors.forename: Jiong
authors.initials: J
authors.lastname: Jia
authors.affiliation: School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong 250100, PR China.
authors.forename: Teng
authors.initials: T
authors.lastname: Wang
authors.affiliation: School of Chemistry, Nankai University, Tianjin 300071, PR China.
authors.forename: Hong Wei
authors.initials: HW
authors.lastname: Sun
authors.affiliation: School of Chemical Engineering, Taishan Medical University, Taian, Shandong 271016, PR China.
authors.forename: Gui Yun
authors.initials: GY
authors.lastname: Duan
authors.affiliation: School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong 250100, PR China. Electronic address: jwwang@sdu.edu.cn.
authors.forename: Jian Wu
authors.initials: JW
authors.lastname: Wang
mesh_terms: D018360:Crystallography, X-Ray; D054879:Halogenation; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D010069:Oxadiazoles / Q000138:chemical synthesis / Q000737:chemistry*; D011720:Pyrazoles / Q000138:chemical synthesis / Q000737:chemistry*; D011725:Pyridines / Q000138:chemical synthesis / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet
chemical_list: D010069:Oxadiazoles; D011720:Pyrazoles; D011725:Pyridines; C031280:pyrazole; C023666:pyridine
keywords: 1,3,4-Oxadiazole; Fluorescence; Imidazo[1,5-a]pyridine; Pyrazole; UV absorption