A Single 2‐(2′‐Hydroxyphenyl)benzothiazole Derivative Can Achieve Pure White‐Light Emission. Issue 11 (4th September 2014)

• Record Type: Journal Article
• Authors: Cheng, Jinling; Liu, Di; Bao, Lijun; Xu, Kai; Yang, Yang; Han, Keli
• Is Part Of: Chemistry, an Asian journal. Volume 9:Issue 11(2014:Nov.)
• Page Start: 3215
• Page End: 3220
• Publication Date: 2014-09-04
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1002/asia.201402779
• Languages: English
• ISSNs: 1861-4728

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>The synthesis and photophysics of two novel 2‐(2′‐hydroxyphenyl)benzothiazole (HBT) derivatives are presented. The electron‐withdrawing trifluoromethyl (CF₃) group in compound <bold>1</bold> facilitates the deprotonation of the phenolic hydroxy group. Well‐resolved triple fluorescence from the enol, keto, and phenolic anion, which ranges from 350 to 600 nm, was detected for <bold>1</bold> in ethanol, which marks the first time triple fluorescence from an excited‐state intramolecular proton transfer (ESIPT) molecule has been reported. Both triphenylamine and CF₃ were introduced into derivative <bold>2</bold>. Intramolecular charge transfer and the "red‐edge effect" resulted in the bathochromic shift of dual fluorescence of <bold>2</bold>. Triple fluorescence was also observed for <bold>2</bold> in ethanol. In mixed acetonitrile and ethanol, pure white‐light emission with CIE coordinates of (0.33, 0.33) and a quantum yield of 0.25 was achieved for <bold>2</bold>. This work provides a new avenue for the rational design of an ESIPT molecule to achieve white‐light generation under mild conditions.</p> </abstract>