Exploiting N�H�� Interactions in 2-(dimesitylboraneyl)-1H-pyrrole for Luminescence Enhancement

Kalluvettukuzhy, NK and Pagidi, S and Prasad Nandi, R and Thilagar, P (2020) Exploiting N�H�� Interactions in 2-(dimesitylboraneyl)-1H-pyrrole for Luminescence Enhancement. In: Asian Journal of Organic Chemistry, 9 (4). pp. 644-651.

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Abstract

Design and development of stable blue emitters are challenging owing to their potential applications in displays and lighting technologies. Triarylborane (TAB) with suitable donors has been extensively exploited in several fields. We report herein the synthesis and structural characterization of a simple 2-(dimesitylboryl)-1H-pyrrole (2) and its precursor N-Boc-(dimesitylboryl)-pyrrole (1). In the crystal lattice of 2, supramolecular dimer was formed by strong N�H�� (2.59 à ) hydrogen bonding interactions between the monomers and this dimer is further connected by weak van der Waals interactions (C�H��) with neighbouring dimers to form a supramolecular network. There is no solvatochromism noted in the absorption spectra, however significant positive solvatochromism was observed in the fluorescence spectra; points to the polar nature of excited state of 1 and 2. Compound 2 showed intense and efficient blue color luminescence in the solid state than that of 1. Thus, N�H�� interactions and �-excessive nature of pyrrole are responsible for the above features. Impressively, compounds 1 and 2 exhibit the phosphorescence emission with a long-lived lifetime of �0.55 s at 77 K and delayed fluorescence at room temperature. DFT/TD-DFT calculations were performed to support the experimental observations. © 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

Item Type:	Journal Article
Publication:	Asian Journal of Organic Chemistry
Publisher:	Wiley-VCH Verlag
Additional Information:	Copyright of this article belongs to Wiley-VCH Verlag
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	22 Apr 2021 09:37
Last Modified:	22 Apr 2021 09:37
URI:	http://eprints.iisc.ac.in/id/eprint/64715

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