Separating innocence and non-innocence of ligands and metals in complexes [(L)Ru(acac)(2)](n) (n =-1, 0,+1; L = o-iminoquinone or o-iminothioquinone)
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Title |
Separating innocence and non-innocence of ligands and metals in complexes [(L)Ru(acac)(2)](n) (n =-1, 0,+1; L = o-iminoquinone or o-iminothioquinone)
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Creator |
PATRA, S
SARKAR, B MOBIN, SM KAIM, W LAHIRI, GK |
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Subject |
quinone-related ligands
ruthenium complexes semiquinone ligands radical complexes amine oxidases ground-state pi-radicals mononuclear chemistry oxidation |
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Description |
The diamagnetic title complexes were obtained from Ru(acac)(2)(CH3CN)(2) and 2-aminophenol or 2-aminothiophenol. X-ray structure analysis of (L-1)Ru(acac)(2) (L-1 = o-iminoquinone) revealed C-C intra-ring, C-O, and C-N distances which suggest a Ru-III-iminosemiquinone oxidation state distribution with antiparallel spin-spin coupling. One-electron oxidation and reduction of both title compounds to paramagnetic monocations [(L)Ru(acac)(2)](+) or monoanions [(L)Ru(acac)(2)](-) occurs reversibly at widely separated potentials (DeltaE > 1.3 V) and leads to low-energy shifted charge transfer bands. In comparison with clearly established Ru-II-semiquinone or Ru-III-catecholate systems the g tensor components 2.23 > g(1) > 2.09, 2.16 > g(2) > 2.07, and 1.97 > g(3) > 1.88 point to considerable metal contributions to the singly occupied MO, corresponding to Ru-III complexes with either o-quinonoid (--> cations) or catecholate-type ligands (--> anions) and only minor inclusion of Ru-IV- or Ru-II-iminosemiquinone formulations, respectively. The preference for the Ru-III oxidation state for all accessible species is partially attributed to the monoanionic 2,4- pentanedionate (acac) co-ligands which favor a higher metal oxidation state than, e.g., neutral 2,2'-bipyridine (bpy).
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Publisher |
AMER CHEMICAL SOC
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Date |
2011-07-14T19:59:18Z
2011-12-26T12:47:36Z 2011-12-27T05:37:00Z 2011-07-14T19:59:18Z 2011-12-26T12:47:36Z 2011-12-27T05:37:00Z 2003 |
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Type |
Article
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Identifier |
INORGANIC CHEMISTRY, 42(20), 6469-6473
0020-1669 http://dx.doi.org/10.1021/ic034469h http://dspace.library.iitb.ac.in/xmlui/handle/10054/4052 http://hdl.handle.net/10054/4052 |
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Language |
en
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