Oligotriarylamine-Extended Organoboranes with Tunable Electron-Donating Strength by Changing the Number of Donor Units

Pengfei Li; Yawei Jia; Songhe Zhang; Jiaqi Di; Niu Zhang; Pangkuan Chen

doi:10.1021/acs.inorgchem.1c03578

Oligotriarylamine-Extended Organoboranes with Tunable Electron-Donating Strength by Changing the Number of Donor Units

Pengfei Li, Yawei Jia, Songhe Zhang, Jiaqi Di, Niu Zhang^*, Pangkuan Chen^*

^*Corresponding author for this work

Beijing Institute of Technology

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

7 Citations (Scopus)

Abstract

Triarylborane (Ar₃B) and triarylamine (Ar₃N) have been widely employed to construct electronically different donor-acceptor (D-A) systems. Herein, we describe a series of A-D-A-type luminescent organoboranes L-B₂N_n(n = 1, 3, 5) that show an increased number of Ar₃N units as electron donors and two terminal Ar₃B as acceptors. When the Ar₃N moieties were extended from one to five units, their electron-donating strength was gradually enhanced and the highest occupied molecular orbital (HOMO)-lowest unoccupied molecular orbital (LUMO) energy gaps could also be tuned, which was further reflected in the red-shifted emissions from blue (λ_em= 458 nm) to orange (λ_em= 595 nm) with a decrease in E_gap(elect)from 3.19 to 2.61 eV. L-B₂N₅showed a huge Stokes shift (∼14 057 cm^-1) and a considerably bright emission with an enhanced solid-state quantum efficiency (φ_S= 98%) compared with the other members. L-B₂N₃and L-B₂N₅exhibited aggregation-induced emissions (AIEs), and an apparent solvatochromic shift was also observed in the emission spectra as the solvent was changed from hexane to tetrahydrofuran (THF) (430 → 595 nm). In addition, the donor-acceptor charge-transfer character in these organoboranes caused a thermally responsive emission over a broad range.

Original language	English
Pages (from-to)	3951-3958
Number of pages	8
Journal	Inorganic Chemistry
Volume	61
Issue number	9
DOIs	https://doi.org/10.1021/acs.inorgchem.1c03578
Publication status	Published - 7 Mar 2022

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Li, P., Jia, Y., Zhang, S., Di, J., Zhang, N., & Chen, P. (2022). Oligotriarylamine-Extended Organoboranes with Tunable Electron-Donating Strength by Changing the Number of Donor Units. Inorganic Chemistry, 61(9), 3951-3958. https://doi.org/10.1021/acs.inorgchem.1c03578

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title = "Oligotriarylamine-Extended Organoboranes with Tunable Electron-Donating Strength by Changing the Number of Donor Units",

abstract = "Triarylborane (Ar3B) and triarylamine (Ar3N) have been widely employed to construct electronically different donor-acceptor (D-A) systems. Herein, we describe a series of A-D-A-type luminescent organoboranes L-B2Nn(n = 1, 3, 5) that show an increased number of Ar3N units as electron donors and two terminal Ar3B as acceptors. When the Ar3N moieties were extended from one to five units, their electron-donating strength was gradually enhanced and the highest occupied molecular orbital (HOMO)-lowest unoccupied molecular orbital (LUMO) energy gaps could also be tuned, which was further reflected in the red-shifted emissions from blue (λem= 458 nm) to orange (λem= 595 nm) with a decrease in Egap(elect)from 3.19 to 2.61 eV. L-B2N5showed a huge Stokes shift (∼14 057 cm-1) and a considerably bright emission with an enhanced solid-state quantum efficiency (φS= 98%) compared with the other members. L-B2N3and L-B2N5exhibited aggregation-induced emissions (AIEs), and an apparent solvatochromic shift was also observed in the emission spectra as the solvent was changed from hexane to tetrahydrofuran (THF) (430 → 595 nm). In addition, the donor-acceptor charge-transfer character in these organoboranes caused a thermally responsive emission over a broad range.",

author = "Pengfei Li and Yawei Jia and Songhe Zhang and Jiaqi Di and Niu Zhang and Pangkuan Chen",

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AU - Li, Pengfei

AU - Jia, Yawei

AU - Zhang, Songhe

AU - Di, Jiaqi

AU - Zhang, Niu

AU - Chen, Pangkuan

PY - 2022/3/7

Y1 - 2022/3/7

N2 - Triarylborane (Ar3B) and triarylamine (Ar3N) have been widely employed to construct electronically different donor-acceptor (D-A) systems. Herein, we describe a series of A-D-A-type luminescent organoboranes L-B2Nn(n = 1, 3, 5) that show an increased number of Ar3N units as electron donors and two terminal Ar3B as acceptors. When the Ar3N moieties were extended from one to five units, their electron-donating strength was gradually enhanced and the highest occupied molecular orbital (HOMO)-lowest unoccupied molecular orbital (LUMO) energy gaps could also be tuned, which was further reflected in the red-shifted emissions from blue (λem= 458 nm) to orange (λem= 595 nm) with a decrease in Egap(elect)from 3.19 to 2.61 eV. L-B2N5showed a huge Stokes shift (∼14 057 cm-1) and a considerably bright emission with an enhanced solid-state quantum efficiency (φS= 98%) compared with the other members. L-B2N3and L-B2N5exhibited aggregation-induced emissions (AIEs), and an apparent solvatochromic shift was also observed in the emission spectra as the solvent was changed from hexane to tetrahydrofuran (THF) (430 → 595 nm). In addition, the donor-acceptor charge-transfer character in these organoboranes caused a thermally responsive emission over a broad range.

AB - Triarylborane (Ar3B) and triarylamine (Ar3N) have been widely employed to construct electronically different donor-acceptor (D-A) systems. Herein, we describe a series of A-D-A-type luminescent organoboranes L-B2Nn(n = 1, 3, 5) that show an increased number of Ar3N units as electron donors and two terminal Ar3B as acceptors. When the Ar3N moieties were extended from one to five units, their electron-donating strength was gradually enhanced and the highest occupied molecular orbital (HOMO)-lowest unoccupied molecular orbital (LUMO) energy gaps could also be tuned, which was further reflected in the red-shifted emissions from blue (λem= 458 nm) to orange (λem= 595 nm) with a decrease in Egap(elect)from 3.19 to 2.61 eV. L-B2N5showed a huge Stokes shift (∼14 057 cm-1) and a considerably bright emission with an enhanced solid-state quantum efficiency (φS= 98%) compared with the other members. L-B2N3and L-B2N5exhibited aggregation-induced emissions (AIEs), and an apparent solvatochromic shift was also observed in the emission spectra as the solvent was changed from hexane to tetrahydrofuran (THF) (430 → 595 nm). In addition, the donor-acceptor charge-transfer character in these organoboranes caused a thermally responsive emission over a broad range.

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JO - Inorganic Chemistry

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ER -

Oligotriarylamine-Extended Organoboranes with Tunable Electron-Donating Strength by Changing the Number of Donor Units

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