Extended knowledge of 6-Bromo-2,2′-bipyridine

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In the evaluation of systems designed for catalytic water oxidation, ceric ammonium nitrate (CAN) is often used as a sacrificial electron acceptor. One of the sources of failure for such systems is oxidative decay of the catalyst in the presence of the strong oxidant CAN (Eox = +1.71 V). Little progress has been made in understanding the circumstances behind this decay. In this study we show that a 2-(2?-hydroxphenyl) derivative (LH) of 1,10-phenanthroline (phen) in the complex [Ru(L)(tpy)]+ (tpy = 2,2?6?,2?-terpyridine) can be oxidized by CAN to a 2-carboxy-phen while still bound to the metal. This complex is, in fact, a very active water oxidation catalyst. The incorporation of a methyl substituent on the phenol ring of LH slows down the oxidative decay and consequently slows down the catalytic oxidation. An analogous system based on bpy (2,2?-bipyridine) instead of phen shows much lower activity under the same conditions. Water molecule association to the Ru center of [Ru(L)(tpy)]+ and carboxylate donor dissociation were proposed to occur at the trivalent state. The resulting [RuIII-OH2] was further oxidized to [RuIV=O] via a PCET process.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI