Unprecedented iminobenzosemiquinone and iminobenzoquinone coordinated mononuclear Cu(II) complex formation under air
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Dalton Trans., 2015, Advance Article
DOI: 10.1039/C4DT03263B
Received 22 Oct 2014, Accepted 23 Dec 2014
First published online 24 Dec 2014
Two non-innocent 2-anilino-4,6-di-tert-butylphenol units were connected through an -orthobridging S atom and provided the ligand H4LS(AP/AP). The ligand reacted with CuCl2·2H2O in the presence of Et3N under air and generated a mononuclear Cu(II) complex (1, [CuLS(IBQ/ISQ)Cl]0). A single crystal X-ray diffraction analysis confirmed that in the complex one of the two 2-anilido-4,6-di-tert-butylphenol arms was present in its one-electron oxidized iminobenzosemiquinone form, while the other was in its two-electron oxidized iminobenzoquinone form. The monoradical-containing Cu(II) complex was diamagnetic in nature owing to a strong antiferromagnetic coupling between the single electron containing dx2–y2 magnetic orbital of Cu(II) and the radical-centered unpaired electron.
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