title: Study on the synthesis and structure-effect relationship of multi-aryl imidazoles with their fluorescence properties.
abstract: In this paper, 23 multi-aryl imidazole derivatives were synthesized and identified by nuclear magnetic resonance, ultraviolet-visible and elemental analysis. At the same time, their ultraviolet-visible maximum absorption (λ(ab)(max)), fluorescence emission maximum (λ(em)(max)) and quantum yields (Ф(f)) were measured. The relationships between the optical behaviors and structures for these compounds were assessed. The results show that the λ(max)(ab) and λ(max)(em) are red-shifted and the fluorescence Ф(f) are increased by the introduction of electron-withdrawing substituents and the increase in the planarity of multi-aryl imidazole molecules. The results also showed that the fluorescence quantum yields of the compounds containing two imidazole nuclei are double the corresponding mono-imidazole nucleus compounds.
authors.affiliation: College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, Hunan, China.
authors.forename: Mi
authors.initials: M
authors.lastname: Tian
authors.forename: Chao
authors.initials: C
authors.lastname: Wang
authors.forename: LiGong
authors.initials: L
authors.lastname: Wang
authors.forename: Kai
authors.initials: K
authors.lastname: Luo
authors.forename: An
authors.initials: A
authors.lastname: Zhao
authors.forename: CanCheng
authors.initials: C
authors.lastname: Guo
mesh_terms: D005453:Fluorescence; D005456:Fluorescent Dyes / Q000138:chemical synthesis / Q000737:chemistry*; D007093:Imidazoles / Q000138:chemical synthesis / Q000737:chemistry*; D015394:Molecular Structure; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet
chemical_list: D005456:Fluorescent Dyes; D007093:Imidazoles; C029899:imidazole
keywords: fluorescent molecule; molecular planarity; multi-aryl imidazole; quantum yield; structure-activity