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Synthesis, electrochemical, and molecular inclusion properties of 'canopied' trinuclear ruthenium complexes with six anchoring groups on an ITO electrode

Synthesis, electrochemical, and molecular inclusion properties of 'canopied' trinuclear ruthenium complexes with six anchoring groups on an ITO electrode

Dalton Transactions 2008(36): 4846-4854

New trinuclear Ru complexes bearing both 1,3,5-tris(2,2':6',2''-terpyridyl)benzene and bis(benzimidazol-2-yl)pyridine with six phosphonate anchors were synthesised and immobilised on an ITO electrode. The 'canopied' structure was proved by AFM measurements. The immobilised Ru trinuclear complex revealed a one step three-electron oxidation process for the Ru(II/III) couple at around +0.9 V vs. Ag/AgCl, indicating that the Ru-Ru interaction is small. For the Ru immobilised ITO surface, the electron transfer blocking and the electron mediation of [Fe(CN)6]4- oxidation through the Ru(III) <--> Ru(II) catalytic cycle are strongly dependent on the alkyl chain length. The spectroelectrochemistry of the Ru trinuclear complex monolayer on the ITO electrode showed a stable electrochromic response under the potential pulse. The present 'canopied' Ru trinuclear complexes hold a small cavity that encapsulates tetrathiafulvalene molecules, which can be proved by a cyclic voltammogram.

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Accession: 056085715

Download citation: RISBibTeXText

PMID: 18766216

DOI: 10.1039/b807526c

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