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By cyclic voltammetry, it was shown that all complexes have a cathode potential (E) compatible with an intracellular reduction by the common bio-reducing agents ascorbate, glutathione, and NADH (reduced nicotinamide adenine dinucleotide), with previously mentioned compounds 4, 5, and 6 having greater tendency to undergo reduction than compounds 1-3 having only hydroxido (1) or carboxylato (2 and 3) ligands in axial positions.
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