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A Molecular Boron Cluster-Based Chromophore with Dual Emission

preprint
submitted on 23.02.2020, 05:07 and posted on 25.02.2020, 05:42 by Kierstyn P. Anderson, Mary A. Waddington, Gary J. Balaich, Julia M. Stauber, Justin R. Caram, Peter I. Djurovich, Alexander Spokoyny
Bromination of the luminescent borane, anti-B18H22, via electrophilic substitution using AlCl3 and Br2 yields the monosubstituted derivative 4-Br-anti-B18H21 as an air-stable crystalline solid. In contrast to the unsubstituted parent compound, 4-Br-anti-B18H21 product possesses dual emission upon excitation with UV light and exhibits fluorescence at 410 nm and phosphorescence at 503 nm, with Фtotal = 0.07 in oxygen-free cyclohexane. Increased oxygen content in cyclohexane solution quenches the phosphorescence signal. The fluorescent signal intensity remains unaffected by oxygen, suggesting that this molecule could be used as a ratiometric oxygen probe.

Funding

CHE-1846849

DGE-1650604

History

Email Address of Submitting Author

spokoyny@chem.ucla.edu

Institution

University of California, Los Angeles

Country

USA

ORCID For Submitting Author

0000-0002-5683-6240

Declaration of Conflict of Interest

Authors declare no conflict of interests.

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in Dalton Transactions

ChemRxiv

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