Issue 36, 2022

Boron complexes of π-extended nitroxide ligands exhibiting three-state redox processes and near-infrared-II (NIR-II) absorption properties

Abstract

Persistent radicals have attracted increasing attention owing to their fascinating properties, including multi-step redox and long-wavelength absorption characteristics. In this study, boron complexes with π-extended nitroxide ligands were synthesised via Buchwald–Hartwig amination reactions of the corresponding boron-nitroxide complex and diarylamines. These nitroxide complexes exhibited two-step and reversible one-electron oxidation processes, suggesting stable redox triads involving anionic aminoxide, neutral nitroxide-radical, and cationic oxoammonium ligands. Cationic boron complexes of the nitroxide radical ligands were obtained via chemical oxidation of the aminoxide complexes and structurally characterised. The cationic nitroxide-radical complexes exhibited strong absorptions at approximately 1100 nm, demonstrating their potential as near-infrared (NIR)-II-active functional dyes.

Graphical abstract: Boron complexes of π-extended nitroxide ligands exhibiting three-state redox processes and near-infrared-II (NIR-II) absorption properties

Supplementary files

Article information

Article type
Paper
Submitted
05 Aug 2022
Accepted
25 Aug 2022
First published
26 Aug 2022

Dalton Trans., 2022,51, 13675-13680

Boron complexes of π-extended nitroxide ligands exhibiting three-state redox processes and near-infrared-II (NIR-II) absorption properties

M. Nakamura, R. Hyakutake, S. Morisako, T. Sasamori, Y. Mizuhata, N. Tokitoh, K. Nakashima, H. Fukumoto and T. Agou, Dalton Trans., 2022, 51, 13675 DOI: 10.1039/D2DT02545K

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