External Stimuli Responsive Bis(anthryl)borylaniline AIEgens for Viscosity and Temperature Sensing: The Game of Molecular Flexibility

Pandey, UP and Thilagar, P (2020) External Stimuli Responsive Bis(anthryl)borylaniline AIEgens for Viscosity and Temperature Sensing: The Game of Molecular Flexibility. In: Advanced Optical Materials, 8 (14).

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Abstract

External stimuli-responsive luminogens have attracted a lot of attention in the recent years owing to their potential applications in various fields such as sensing, bio-probes, and optical devices. In this work, the design and synthesis of a new class of external stimuli-responsive anthracene based fluorescent bis-(anthryl)boryl anilines 1 and 2 are disclosed. The electronic and optical properties of these compounds are fine-tuned by varying the amine donor strength. Using steady-state and time-resolved photoluminescnece studies in both solution and condensed state together with computational studies (both ground and excited state), it is established that both 1 and 2 exhibit molecular motion dependent emission characteristics. Owing to their molecular conformational flexibility and inherent charge transfer characteristics, 1 and 2 show intriguing optical features such as aggregation induced emission enhancement, viscochromism, temperature sensing, and mechanoluminescence as compared to structurally rigid tris(9-anthryl)boron without amine donor moieties. These unique properties of 1 and 2 are utilized for detecting local viscosity and temperature sensing over a wide range from 190�300 K. Compound 2 emits pure white light ((Commission internationale de l'éclairage) CIE 0.33, 0.33) at 250 K. © 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Item Type:	Journal Article
Publication:	Advanced Optical Materials
Publisher:	Wiley-VCH Verlag
Additional Information:	Copyright of this article belongs to Wiley-VCH Verlag
Keywords:	Aniline; Charge transfer; Optical properties; Temperature sensors; Viscosity, Aggregation-induced emissions; Computational studies; Conformational flexibility; Electronic and optical properties; Emission characteristics; Molecular flexibility; Temperature sensing; Transfer characteristics, Excited states
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	06 Apr 2021 11:12
Last Modified:	06 Apr 2021 11:12
URI:	http://eprints.iisc.ac.in/id/eprint/65441

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