Molecular Persistent Room-Temperature Phosphorescence from Tetraarylaminoboranes

Rajendra Prasad Nandi, Neena K. Kalluvettukuzhy, Sudhakar Pagidi, Pakkirisamy Thilagar

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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.

Original languageEnglish
Pages (from-to)1122-1134
Number of pages13
JournalInorganic Chemistry
Issue number3
StatePublished - 23 Jan 2023
Externally publishedYes

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