A New V‐Shaped Organic Fluorescent Compound Integrated with Crystallization‐Induced Emission Enhancement and IntramolecularCharge Transfer. Issue 9 (2nd July 2013)

• Record Type: Journal Article
• Authors: Gu, Pei‐Yang; Zhang, You‐Hao; Liu, Gao‐Yan; Ge, Jian‐Feng; Xu, Qing‐Feng; Zhang, Qichun; Lu, Jian‐Mei
• Is Part Of: Chemistry, an Asian journal. Volume 8:Issue 9(2013:Sep.)
• Page Start: 2161
• Page End: 2166
• Publication Date: 2013-07-02
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1002/asia.201300331
• Languages: English
• ISSNs: 1861-4728

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>The emission behavior of a new V‐shaped organic fluorescent compound (<italic>p</italic>, <italic>p</italic>′‐bis(2‐aryl‐1, 3, 4‐oxadiazol‐5‐yl)diphenyl sulfone (<bold>OZA-SO</bold>), consisting of diethylamino (donor) and sulfone (acceptor) units, has been studied in various polar solvents and with different morphologies. As expected, there is the gradual transition from the locally excited state to the <named-content id="d390e502" content-type="reactionType" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink">intramolecular</named-content> charge‐transfer (ICT) state with the increasing solvent polarity. The photoluminescence intensity of <bold>OZA-SO</bold> initially decreases with a low water fraction (<italic>f</italic><sub>w</sub>), owing to ICT effect, and then increases with a high <italic>f</italic><sub>w</sub>, owing to crystallization‐induced emission enhancement. At the same time, the fluorescence lifetime of <bold>OZA-SO</bold> increases from 0.062 ns in dimethylformamide (DMF) to 5.80 ns in a solution containing 90 % water, and then to 7.49 ns in a solution containing 60 % water. Furthermore, the solid‐state emission of <bold>OZA-SO</bold> can be tuned reversibly from green to yellow by fuming/grinding or fuming/heating owing to morphological changes. This color‐switchable feature of <bold>OZA-SO</bold> may have potential applications in optical‐recording and temperature‐sensing materials.</p> </abstract>