Issue 5, 2004

The triruthenium complex [{(acac)2RuII}3(L)] containing a conjugated diquinoxaline[2,3-a:2′,3′-c]phenazine (L) bridge and acetylacetonate (acac) as ancillary ligands. Synthesis, spectroelectrochemical and EPR investigation

Abstract

The compound [{(acac)2Ru}3(L)] (1) undergoes three well-separated one-electron oxidation and reduction processes. The EPR results indicate electron removal from the ruthenium(II) centres on oxidation and the occupation of a largely L-based molecular orbital on reduction. In spite of well-separated (ΔE ≥ 340 mV) oxidation no obvious intervalence charge transfer bands were detected in the Vis, NIR or IR regions, suggesting very weak electronic coupling between the metal centres in the mixed-valent intermediates 1+ and 12+. The separated (ΔE ≥ 540 mV) stepwise reduction produces weak near-infrared features associated with partially occupied π* orbitals of L, the unusually high g anisotropy in the EPR spectrum of 1 is attributed to the occupation of a degenerate MO by the unpaired electron.

Graphical abstract: The triruthenium complex [{(acac)2RuII}3(L)] containing a conjugated diquinoxaline[2,3-a:2′,3′-c]phenazine (L) bridge and acetylacetonate (acac) as ancillary ligands. Synthesis, spectroelectrochemical and EPR investigation

Article information

Article type
Paper
Submitted
08 Dec 2003
Accepted
13 Jan 2004
First published
30 Jan 2004

Dalton Trans., 2004, 754-758

The triruthenium complex [{(acac)2RuII}3(L)] containing a conjugated diquinoxaline[2,3-a:2′,3′-c]phenazine (L) bridge and acetylacetonate (acac) as ancillary ligands. Synthesis, spectroelectrochemical and EPR investigation

S. Patra, B. Sarkar, S. Ghumaan, J. Fiedler, W. Kaim and G. K. Lahiri, Dalton Trans., 2004, 754 DOI: 10.1039/B316007F

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