A copper(I) complex with two unpaired electrons, synthesised by oxidation of a copper(II) complex with two redox-active ligands
Two homoleptic copper(II) complexes [Cu(L1)2] and [Cu(L2)2] with anionic redox-active ligands were synthesised, one with urea azine (L1) and the other with thio-urea azine (L2) ligands. One-electron oxidation of the complexes initiates an unprecedented redox-induced electron transfer process, leadin...
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| Main Authors: | , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
2021
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| In: |
Angewandte Chemie. International edition
Year: 2021, Volume: 60, Issue: 43, Pages: 23451-23462 |
| ISSN: | 1521-3773 |
| DOI: | 10.1002/anie.202109367 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1002/anie.202109367 Verlag, lizenzpflichtig, Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1002/anie.202109367 
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| Author Notes: | Marco Werr, Elisabeth Kaifer, Markus Enders, Andika Asyuda, Michael Zharnikov, and Hans-Jörg Himmel |
MARC
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| 245 | 1 | 2 | |a A copper(I) complex with two unpaired electrons, synthesised by oxidation of a copper(II) complex with two redox-active ligands |c Marco Werr, Elisabeth Kaifer, Markus Enders, Andika Asyuda, Michael Zharnikov, and Hans-Jörg Himmel |
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| 520 | |a Two homoleptic copper(II) complexes [Cu(L1)2] and [Cu(L2)2] with anionic redox-active ligands were synthesised, one with urea azine (L1) and the other with thio-urea azine (L2) ligands. One-electron oxidation of the complexes initiates an unprecedented redox-induced electron transfer process, leading to monocationic copper(I) complexes [Cu(L1)2]+ and [Cu(L2)2]+ with two oxidised ligands. While [Cu(L1)2]+ is best described as a CuI complex with two neutral radical ligands that couple antiferromagnetically, [Cu(L2)2]+ is a CuI complex with two clearly different ligand units in the solid state and with a magnetic susceptibility close to a diamagnetic compound. Further one-electron oxidation of the complex with L1 ligands results in a dication [Cu(L1)2]2+, best described as a CuI complex with a twofold oxidised, monocationic ligand and a neutral radical ligand. The stability in at least three redox states, the accumulation of spin density at the ligands and the facile ligand-metal electron transfer make these complexes highly attractive for a variety of applications; here the catalytic aerobic oxidation of alcohols to aldehydes is tested. | ||
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