Molecular Persistent Room-Temperature Phosphorescence from Tetraarylaminoboranes

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

doi:10.1021/acs.inorgchem.2c03386

Molecular Persistent Room-Temperature Phosphorescence from Tetraarylaminoboranes

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

Indian Institute of Science Bangalore

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

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.

Original language	English
Pages (from-to)	1122-1134
Number of pages	13
Journal	Inorganic Chemistry
Volume	62
Issue number	3
DOIs	https://doi.org/10.1021/acs.inorgchem.2c03386
State	Published - 23 Jan 2023
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2023 American Chemical Society.

Funding

P.T. thanks SERB New Delhi, India (EEQ/2018/0143 dt 20.02.2019), for research funding, R.P.N. thanks IISc for a research fellowship, and N.K.K. and S.P. thank SERB for financial support. The authors thank IPC Department and IISc Bangalore, India, for infrastructure and instrumental facilities. The authors thank Dr. Sudeeksha and Mr. Rakesh from the HORIBA-IISc Technical Centre for Raman microscopy and spectroscopy data collection.

Funders	Funder number
IPC Department
Indian Institute of Science
Science and Engineering Research Board	EEQ/2018/0143 dt 20.02.2019

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title = "Molecular Persistent Room-Temperature Phosphorescence from Tetraarylaminoboranes",

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.",

author = "Nandi, {Rajendra Prasad} and Kalluvettukuzhy, {Neena K.} and Sudhakar Pagidi and Pakkirisamy Thilagar",

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AU - Nandi, Rajendra Prasad

AU - Kalluvettukuzhy, Neena K.

AU - Pagidi, Sudhakar

AU - Thilagar, Pakkirisamy

PY - 2023/1/23

Y1 - 2023/1/23

N2 - 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.

AB - 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.

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JF - Inorganic Chemistry

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Molecular Persistent Room-Temperature Phosphorescence from Tetraarylaminoboranes

Abstract

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