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Photoredox Reactions of Rh III Polypyridyl Complexes

On the basis of the reduction potential of Rh(phen) (Eo = — 0.75 V/SCE) and of its nn energy (2.75 eV), Rh(phen)3 in the nn state is expected to be a very powerful oxidising agent (with a reduction potential of 2.0 V/SCE [133]), making it a stronger oxidant than the MLCT states of the Ru(II) complexes discussed above. Electron transfer from aromatic amines [134] or di-and tri-methoxybenzenes [135] to excited Rh(III) polypyridyl complexes have indeed been observed. [Pg.61]

Although the redox potentials of Rh(phen)2Cl2 are unknown, electron transfer from methoxybenzene to the MC state of this complex has also been reported [134] however, with a lower quenching rate constant than for Rh(phen)3.  [Pg.61]

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Polypyridyl

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