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A low-spin manganese(II) complex with an emissive charge-transfer excited state.

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Title: A low-spin manganese(II) complex with an emissive charge-transfer excited state.
Authors: Rhames, Maxwell C.1 (AUTHOR), Burnett, Nora L.2 (AUTHOR), Lee, Annemarie A.2 (AUTHOR), Clark, Colin B.2 (AUTHOR), Tocco, William C.1 (AUTHOR), Ahmed, Ahshabibi2 (AUTHOR), Ruhren, Alexander N.2 (AUTHOR), Besson, Claire2 (AUTHOR), Panetier, Julien A.2 (AUTHOR), Swierk, John R.2 (AUTHOR) jswierk@binghamton.edu, Arias-Rotondo, Daniela M.1 (AUTHOR) dariasr@kzoo.edu
Source: Dalton Transactions: An International Journal of Inorganic Chemistry. 3/10/2026, Vol. 55 Issue 10, p4097-4101. 5p.
Subjects: Excited states, Metal complexes, Electron spin states, Absorption spectra, Time-resolved spectroscopy, Photocatalysts, Ligands (Chemistry)
Abstract: Manganese is an attractive earth-abundant metal for chromophores because it has multiple oxidation states, making it well-suited for photochemical applications involving electron transfer reactivity. Unfortunately, the tendency of manganese(II) to form high-spin complexes with metal-centered excited states has limited its viability. Herein, we disclose an air-stable Mn(II) complex with N-heterocyclic carbene ligands. Spectroscopy revealed panchromatic absorption with two main bands in the visible region (with maxima at 480 nm and 580 nm), which have mixed charge-transfer and metal-centered character. Excitation into the low-energy band leads to an emissive state with a maximum at 770 nm (QY = 5.7 × 10−4). Time-resolved emission spectroscopy revealed biphasic kinetics for the ground state recovery and a lifetime of 480 ps. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Manganese is an attractive earth-abundant metal for chromophores because it has multiple oxidation states, making it well-suited for photochemical applications involving electron transfer reactivity. Unfortunately, the tendency of manganese(II) to form high-spin complexes with metal-centered excited states has limited its viability. Herein, we disclose an air-stable Mn(II) complex with N-heterocyclic carbene ligands. Spectroscopy revealed panchromatic absorption with two main bands in the visible region (with maxima at 480 nm and 580 nm), which have mixed charge-transfer and metal-centered character. Excitation into the low-energy band leads to an emissive state with a maximum at 770 nm (QY = 5.7 × 10−4). Time-resolved emission spectroscopy revealed biphasic kinetics for the ground state recovery and a lifetime of 480 ps. [ABSTRACT FROM AUTHOR]
ISSN:14779226
DOI:10.1039/d5dt02990b