Abstract
61 The chemistry of metal complexes containing redox active ligands have been rapidly developed in recent decades [1–3]. Compounds that can behave as redox active ligands, o quinones and their nitrogen containing analogues, have been best studied. How ever, these compounds have a limited range of redox states. The use of N,N' bis(3,5 di tert butyl 2 hydroxyphenyl) 1,2 phenylenediamine (H4L 4) [4] as a redox active ligand makes it possible to considerably extend of the range of metal compounds containing a redox active ligand and a metal in specified oxidation states. This ligand in a metal complex can exist in five different redox states (Scheme 1), which considerably increases the variety of possible electronic structures. Mono (L1) and trianionic (L3) forms of the ligand are paramagnetic, while dianionic (L2), tetraanionic (L4), and neutral forms (L0) are diamagnetic.
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