The triruthenium complex [[(acac)2Ru(II)]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

Dalton Transactions : an International Journal of Inorganic Chemistry
Srikanta PatraGoutam Kumar Lahiri

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 (DeltaE > or = 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 1(2+). The separated (DeltaE > or = 540 mV) stepwise reduction produces weak near-infrared features associated with partially occupied pi* 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.

References

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Citations

Jul 13, 2011·Inorganic Chemistry·Wolfgang Kaim
Jul 20, 2007·Chemical Communications : Chem Comm·Céline OlivierStéphane Rigaut
Mar 25, 2008·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·G VenkatachalamR Ramesh
Nov 3, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Mohd Asif AnsariGoutam Kumar Lahiri
Oct 20, 2010·Dalton Transactions : an International Journal of Inorganic Chemistry·Sayak Roy, Clifford P Kubiak
Jul 22, 2011·Dalton Transactions : an International Journal of Inorganic Chemistry·Dipanwita DasGoutam Kumar Lahiri
Feb 27, 2007·Angewandte Chemie·Wolfgang Kaim, Goutam Kumar Lahiri
Aug 3, 2013·Dalton Transactions : an International Journal of Inorganic Chemistry·Ankita DasGoutam Kumar Lahiri
Mar 12, 2011·Dalton Transactions : an International Journal of Inorganic Chemistry·Karine Costuas, Stéphane Rigaut
Dec 29, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Farheen Fatima KhanGoutam Kumar Lahiri
Feb 23, 2008·Journal of the American Chemical Society·Biprajit SarkarWolfgang Kaim
Aug 24, 2007·Journal of the American Chemical Society·Juan-Manuel HerreraMichael D Ward

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