XPS detection of unusual Cu(II) to Cu(I) transition on the surface of complexes with redox-active ligands

•We observed valence tautomerism in copper complex.•Antiferromagnetic spin interaction at low temperature was assumed.•The role of ligands was revealed. Electronic structure of copper complexes with redox-active ligands was studied by XPS. The temperature dependence of the redistribution of electron...

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Published inJournal of electron spectroscopy and related phenomena Vol. 238; p. 146878
Main Authors Ivanova, T.M., Maslakov, K.I., Sidorov, A.A., Kiskin, M.A., Linko, R.V., Savilov, S.V., Lunin, V.V., Eremenko, I.L.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.01.2020
Subjects
Cu 2p
Redox-active ligands
Satellite
Spin state
Valence tautomerism
XPS
Valence tautomerism
Cu 2p
Satellite
XPS
Redox-active ligands
Spin state
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Summary:•We observed valence tautomerism in copper complex.•Antiferromagnetic spin interaction at low temperature was assumed.•The role of ligands was revealed. Electronic structure of copper complexes with redox-active ligands was studied by XPS. The temperature dependence of the redistribution of electron and spin densities was shown. A low temperature anomaly of magnetic properties of the copper complex with redox-active ligands was detected. The observed two states of copper (Cu+1 and Cu+2) allowed proposing valence tautomerism («redox-isomer» copper complex). The donating role of nitrogen atoms was established in the copper complex with redox-active ligand. The role of ligands in the formation of the electronic structure of square-planar complexes was revealed.
ISSN:0368-2048
1873-2526
DOI:10.1016/j.elspec.2019.06.010