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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]
Copyright of Dalton Transactions: An International Journal of Inorganic Chemistry is the property of Royal Society of Chemistry and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 192206165
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: A low-spin manganese(II) complex with an emissive charge-transfer excited state.
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  Data: <searchLink fieldCode="AR" term="%22Rhames%2C+Maxwell+C%2E%22">Rhames, Maxwell C.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Burnett%2C+Nora+L%2E%22">Burnett, Nora L.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lee%2C+Annemarie+A%2E%22">Lee, Annemarie A.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Clark%2C+Colin+B%2E%22">Clark, Colin B.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tocco%2C+William+C%2E%22">Tocco, William C.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ahmed%2C+Ahshabibi%22">Ahmed, Ahshabibi</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ruhren%2C+Alexander+N%2E%22">Ruhren, Alexander N.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Besson%2C+Claire%22">Besson, Claire</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Panetier%2C+Julien+A%2E%22">Panetier, Julien A.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Swierk%2C+John+R%2E%22">Swierk, John R.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> jswierk@binghamton.edu</i><br /><searchLink fieldCode="AR" term="%22Arias-Rotondo%2C+Daniela+M%2E%22">Arias-Rotondo, Daniela M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> dariasr@kzoo.edu</i>
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  Data: 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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  Data: <i>Copyright of Dalton Transactions: An International Journal of Inorganic Chemistry is the property of Royal Society of Chemistry and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1039/d5dt02990b
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        Text: English
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        PageCount: 5
        StartPage: 4097
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      – SubjectFull: Excited states
        Type: general
      – SubjectFull: Metal complexes
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      – SubjectFull: Electron spin states
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      – SubjectFull: Absorption spectra
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      – SubjectFull: Time-resolved spectroscopy
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      – SubjectFull: Photocatalysts
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      – SubjectFull: Ligands (Chemistry)
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              Text: 3/10/2026
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