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
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)
%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 diquinoxaline2,3-f:2',3'-hphenazine (L) bridge and acetylacetonate (acac) as ancillary ligands. Synthesis, spectroelectrochemical and EPR investigation
%X 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)
@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 = {2019-07-15T13:41:23.000+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/b_schwederski},
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 = {2019-07-15T11:42:10.000+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
}