Assembly of a mixed-valence Cu(I/II) system coupled by multiple hydrogen bonding through tetrahydroxybenzoquinone

Abstract

The synthesis and characterization of a mixed-valence copper complex [Cu II(bpy) 2Cl] 2[Cu ICl 2] 2(C 6O 6H 4), where bpy = 2,2′-bipyridine, is described. The structure contains discrete copper(II) cation and copper(I) anion groups. In the cation each divalent copper is linked to two bpy molecules and one chloride ion in a trigonal bipyramidal fashion, whereas in the anion each monovalent copper is linearly bound to two chlorine atoms. The mixed-valence Cu(I/II) system is associated by multiple hydrogen bonding through tetrahydroxybenzoquinone, leading to an infinite chain structure of the complex. The complex was also characterized by spectroscopic studies.