Molecular Persistent Room-Temperature Phosphorescence from Tetraarylaminoboranes

Nandi, RP and Kalluvettukuzhy, NK and Pagidi, S and Thilagar, P (2022) Molecular Persistent Room-Temperature Phosphorescence from Tetraarylaminoboranes. In: Inorganic Chemistry, 62 (3). pp. 1122-1134.

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Abstract

Herein, we report the synthesis, molecular structure, and optical features of tetrarylaminoboranes 1 (Mes2B-N(Ph)(C10H7)) and 2 (Mes2B-N(Ph)(C14H9)). In the solution state, 1 shows aggregation-induced emission enhancement and color switching, while 2 displays emission color switching and aggregation-caused quenching. At 77 K, frozen solutions of 1 show delayed fluorescence (DF) and phosphorescence, whereas 2 display only DF. Pristine solids of 1 and 2 showed delayed fluorescence under ambient conditions; however, crystals of both compounds show no phosphorescence under similar conditions. Polymethyl methacrylate thin films of 1 (1 wt % doping concentration) exhibit persistent room-temperature phosphorescence (pRTP) lasting for ∼0.5 s. In contrast, 2 does not show phosphorescence under similar conditions. Systematic photophysical studies and theoretical (DFT and TD-DFT) calculations are performed on these molecules to rationalize their intriguing optical characteristics. © 2023 American Chemical Society.

Item Type:	Journal Article
Publication:	Inorganic Chemistry
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to American Chemical Society.
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	09 Feb 2023 11:23
Last Modified:	09 Feb 2023 11:23
URI:	https://eprints.iisc.ac.in/id/eprint/80126

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