Dinuclear copper(II) complex with tetrathiafulvalene-based bis-acetylacetonate ligands

Deprotection of the cyanoethyl groups with 2 equivalents of the strong base (CsOH) and subsequent reaction with the electrophilic 3-chloro-2,4-pentanedione afford the bis(acetylacetone)tetrathiafulvalenes, trans- and cis-acac2. The formation of the dinuclear rectangle-shaped complex [Cu2(cis-acac2)2 ⋅ 2DMF ⋅ 2H2O] (1), demonstrates the chelating ability of the interesting TTF-acetylacetonate ligand. Cyclic voltammetry experiments have evidenced the two one-electron steps to the radical cation and dication species of the new ligand, and the two quasi-reversible two-electron oxidation processes of complex 1.