Multistimuli‐Responsive Luminescence of Naphthalazine Based on Aggregation‐Induced Emission

• Published in: ChemistryOpen (Weinheim) Vol. 4; no. 4; pp. 478 - 482
• Main Authors: Yao, Xiang, Ru, Jia‐Xi, Xu, Cong, Liu, Ya‐Ming, Dou, Wei, Tang, Xiao‐Liang, Zhang, Guo‐Lin, Liu, Wei‐Sheng
• Format: Journal Article
• Language: English
• Published: Germany John Wiley & Sons, Inc 01.08.2015; John Wiley & Sons, Ltd
• Subjects: aggregation-induced emission; Chemical synthesis; Crystallography; Emission; Emission analysis; Emission spectroscopy; Exposure; Fluorescence; Heating; luminescent materials; Mechanical properties; Multifunctional materials; multistimuli-responsive materials; polymorphs; Solvents; X ray powder diffraction; X-rays; aggregation-induced emission; multistimuli-responsive materials; fluorescence; luminescent materials; polymorphs
• ISSN: 2191-1363; 2191-1363
• DOI: 10.1002/open.201500016

Stimuli‐responsive luminescent materials, which are dependent on changes in physical molecular packing modes, have attracted more and more interest over the past ten years. In this study, 2,2‐dihydroxy‐1,1‐naphthalazine was synthesized and shown to exhibit different fluorescence emission in solution and solid states with characteristic aggregation‐induced emission (AIE) properties. A remarkable change in the fluorescence of 2,2‐dihydroxy‐1,1‐naphthalazine occurred upon mechanical grinding, heating, or exposure to solvents. According to the characterization by solid‐state fluorescence spectroscopy, X‐ray crystallography, differential scanning calorimetry, and X‐ray powder diffraction, the fluorescence change could be attributed to transitions between two structurally different polymorphs. These significant properties could also give 2,2‐dihydroxy‐1,1‐naphthalazine more potential applications as a multifunctional material. Grind and make it hot! A remarkable change in the fluorescence emission of 2,2‐dihydroxy‐1,1‐naphthalazine occurs upon mechanical grinding, heating, and exposure to solvents. Its characteristic aggregation‐induced emission (AIE) properties are reported herein. The fluorescence change could be a result of a transition between two structurally different polymorphs. This compound could have applications as a multistimuli‐responsive luminescent material.