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Strongly phosphorescent transition metal p complexes of boron-boron triple bonds

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posted on 2023-06-09, 04:10 authored by Holger Braunschweig, Theresa Dellerman, Rian D Dewhurst, Benjamin Hupp, Thomas Kramer, James D Mattock, Jan Mies, Ashwini K Phukan, Andreas Steffen, Alfredo VargasAlfredo Vargas
Herein are reported the first p complexes of compounds with boron-boron triple bonds to transition metals, in this case CuI. Three different compounds were isolated that differ in the number of copper atoms bound to the BB unit. Metallation of the B-B triple bonds causes significant lengthening of the B-B and B-CNHC bonds, as well as large upfield shifts of the 11B NMR signals, suggesting greater orbital interactions between the boron and transition metal atoms than those observed with recently published diboryne / alkali metal cation complexes. In contrast to previously-reported fluorescent copper(I) p complexes of boron-boron double bonds, the Cun-p-diboryne compounds (n = 2, 3) show intense phosphorescence in the red to near-IR region from their triplet excited states, according to their microsecond lifetimes, with quantum yields of up to 58%. The bonding situation, as well as the unusual photophysical properties, has been further corroborated by DFT studies.

History

Publication status

  • Published

File Version

  • Accepted version

Journal

Journal of the American Chemical Society

ISSN

0002-7863

Publisher

American Chemical Society

Issue

13

Volume

139

Page range

4887-4893

Department affiliated with

  • Chemistry Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2017-03-09

First Open Access (FOA) Date

2018-02-22

First Compliant Deposit (FCD) Date

2017-03-09

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