%0 Journal Article %1 Patra.2004 %A Patra, Srikanta %A Sarkar, Biprajit %A Ghumaan, Sandeep %A Fiedler, Jan %A Kaim, Wolfgang %A Lahiri, Goutam Kumar. %D 2004 %J Dalton Transactions %K acetylacetonato acetylacetonato;EPR bridged diquinoxalinephenazine electrochem prepn redox redox;ruthenium ruthenium spectroelectrochem;UV trinuclear visible %N 5 %P 754--758 %R 10.1039/B316007F %T The triruthenium complex [(acac)2RuII3(L)] containing a conjugated diquinoxaline[2,3-f:2',3'-h]phenazine (L) bridge and acetylacetonate (acac) as ancillary ligands. Synthesis, spectroelectrochemical and EPR investigation %X Triruthenium complex [(acac)2Ru3(L)] (1, L = diquinoxaline[2,3-f:2',3'-h]phenazine) 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)]

@article{Patra.2004, abstract = {Triruthenium complex [{(acac)2Ru}3(L)] (1, L = diquinoxaline[2,3-f:2',3'-h]phenazine) 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. (\textgreek{D}E $\geq$ 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. (\textgreek{D}E $\geq$ 540 mV) stepwise redn. produces weak near-IR features assocd. with partially occupied \textgreek{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)]}, added-at = {2022-06-15T11:26:56.000+0200}, author = {Patra, Srikanta and Sarkar, Biprajit and Ghumaan, Sandeep and Fiedler, Jan and Kaim, Wolfgang and Lahiri, Goutam Kumar.}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/243954b1296c97f9a9fefff2eaab77ef2/huebleriac}, doi = {10.1039/B316007F}, interhash = {d1e11e12f640011bd9015d5fd6100843}, intrahash = {43954b1296c97f9a9fefff2eaab77ef2}, issn = {1477-9226}, journal = {Dalton Transactions}, keywords = {acetylacetonato acetylacetonato;EPR bridged diquinoxalinephenazine electrochem prepn redox redox;ruthenium ruthenium spectroelectrochem;UV trinuclear visible}, number = 5, pages = {754--758}, timestamp = {2022-06-15T09:26:56.000+0200}, title = {The triruthenium complex [{(acac)2RuII}3(L)] containing a conjugated diquinoxaline[2,3-f:2',3'-h]phenazine (L) bridge and acetylacetonate (acac) as ancillary ligands. Synthesis, spectroelectrochemical and EPR investigation}, year = 2004 }