Vanadium-Induced Nucleophilic IPSO Substitutions in a Coordinated Tetrachlorosemiquinone Ring: Formation of the Chloranilate Anion as a Bridging Ligand

In basic media, the coordinated semiquinone radical in the spin-coupled [(bipy)ClVIVO(TCSQ)] 1 (HTCSQ = tetrachlorosemiquinone) undergoes nucleophilic ipso substitution (OH− for Cl−) to generate the chloranilate anion (CA2−) that bridges the vanadium(IV) centers, forming a binuclear compound [(bipy)ClVIVO(CA)OVIVCl(bipy)] 2.