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

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. © 2019 Elsevier B.V.

Ivanova T.M. 1 , Maslakov K.I.2 , Sidorov A.A. 1 , Kiskin M.A.1 , Linko R.V. 3 , Savilov S.V.1 , Lunin V.V.2 , Eremenko I.L.1
  • 1 Kurnakov Institute of General and Inorganic Chemistry of RAS, 31 Leninskii pr., Moscow, 119991, Russian Federation
  • 2 Department of Chemistry, Lomonosov Moscow State University, 1-3 Leninskie Gory, Moscow, 119991, Russian Federation
  • 3 Peoples' Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya St, Moscow, 117198, Russian Federation
Cu 2p; Redox-active ligands; Satellite; Spin state; Valence tautomerism; XPS
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