The triruthenium complex (acac)2RuII3(L) containing a conjugated diquinoxaline2,3-f:2',3'-hphenazine (L) bridge and acetylacetonate (acac) as ancillary ligands. Synthesis, spectroelectrochemical and EPR investigation

, , , , , und . Dalton Transactions (2004)


Triruthenium complex (acac)2Ru3(L) (1, L = diquinoxaline2,3-f:2',3'-hphenazine) is prepd. and undergoes three well-sepd. 1-electron oxidn. and redn. processes. The EPR results indicate electron removal from the Ru(II) centers on oxidn. and the occupation of a largely L-based MO on redn. In spite of well-sepd. (DE $\geq$ 340 mV) oxidn., no obvious intervalence charge transfer bands were detected in the visible, NIR or IR regions, suggesting very weak electronic coupling between the metal centers in the mixed-valent intermediates 1+ and 12+. The sepd. (DE $\geq$ 540 mV) stepwise redn. produces weak near-IR features assocd. with partially occupied p* 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. on SciFinder(R)

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