Copper(II) Complexes with Mono- and Double Reduced Forms of 3,5-Di-tert-octyl-o-benzoquinone

Copper(II) complexes based on 3,5-di-tert-octyl-o-benzoquinone (3,5-t-Oc-Q) have been synthesized. Derivatives of the composition (3,5-t-Oc-SQ)₂Cu (I), (3,5-t-Oc-Cat)Cu(Phen) (II), (3,5‑t-Oc-Cat)Cu(DPQ) (III), and (3,5-t-Oc-Cat)Cu(DPPZ) (IV) have been obtained and characterized, where 3,5-t-Oc-SQ is the radical anion of 3,5-di-tert-octyl-o-benzoquinone, 3,5-t-Oc-Cat is the 3,5-di-tert-octyl-o-benzoquinone dianion, Phen is phenanthroline, DPQ is dipyrido[3,2-d:2′,3′-f]quinoxaline, and DPPZ is dipyrido[3,2-a:2′,3′-c]phenazine. The molecular and crystal structures of complexes I and II have been determined by X-ray diffraction. The spectral characteristics of the synthesized copper(II) derivatives have been studied using electron absorption spectroscopy. Crystallographic data for compounds I and II have been deposited with the Cambridge Structural Database (nos. 2291614 and 2279045 for I and II, respectively).