Polymeric [CuII(SQMe−SQMe)]n has been prepared with a bridging 4,4‘-bis(semiquinone) ligand. Temperature-dependent magnetic properties result from ferromagnetic and antiferromagnetic coupling interactions involving the metal and the diradical ligands. Monomeric (bpy)CuII(CatMe−BQMe) and (PPh3)2CuI(SQMe−BQMe) show that the bis(quinone) ligand is capable of intramolecular modulation of charge distribution.
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Abakumov et al. (2001) studied this question.
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