Abstract
The magnetic interaction between copper(II) and ortho-semiquinones has been investigated by the EPR technique using a spectrometer operating in the millimeter-wavelength range. The polycrystalline-powder EPR spectrum of [Cu(Me 3[12]N 3)-(DTBSQ)]ClO 4 (Me 3[12]N 3 = 2,4,4-trimethyl-1,5,9-triazacyclododec-1-ene; DTBSQ = 3,5-di- t-butyl- o-semiquinonato) recorded at 4.2 with an exciting frequency of 8.17 cm −1, is typical of a spin triplet with a large zero-field splitting (ZFS). The ZFS parameters have been obtained directly from the spectrum using the Wasserman equations. Both dipolar and exchange contributions to the ZFS are discussed within a molecular-orbital framework.
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