The substituted cyclam macrocycle 6,13-diamino-6,13-dimethyl-1,4,8,11-tetra-azacyclotetradecane (L2) can co-ordiante to metal ions as a hexadentate ligand; whereas M–N distances for the NiII complex are ‘normal,’ those for the CoIII complex are unusually short, and this is reflected in a very negative CoIII/II redox couple and a significant shift of the electronic spectrum mmaxima to higher energy.
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Journal of the Chemical Society, Chemical Communications
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