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Evidence for Bidirectional Noninnocent Behavior of a Formazanate Ligand in Ruthenium Complexes.
- Source :
-
Inorganic chemistry [Inorg Chem] 2015 Aug 17; Vol. 54 (16), pp. 8126-35. Date of Electronic Publication: 2015 Aug 05. - Publication Year :
- 2015
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Abstract
- Redox series of the complexes [Ru(L)(L')2](n), L = 1,5-diphenyl-3-(4-tolyl)-formazanate and L' = 2,4-pentanedionate (acac(-)), 2,2'-bipyridine (bpy), or 2-phenylazopyridine (pap), were studied by cyclic and differential pulse voltammetry and by TD-DFT-supported spectroelectrochemistry (UV-vis-NIR, EPR). The precursors [Ru(III)(L(-))(acac(-))2], [Ru(II)(L(-))(bpy)2]ClO4, and [Ru(II)(L(-))(pap)2]ClO4 were identified in their indicated oxidation states by X-ray crystal structure determination. The six-membered formazanato-ruthenium chelate rings have an envelope conformation with puckering of the metal. DFT calculations indicate a pronounced sensitivity of the N-N bond lengths toward the ligand oxidation state. Several electrochemically accessible charge states were analyzed, and the derived oxidation numbers Ru(II), Ru(III), or Ru(IV), L' or (L')(•-), and L(-), L(•2-), or the new formazanyl ligand L(•) for the two-way noninnocent formazanate reflect the increasing acceptor effect of the ancillary ligands L' in the series acac(-) < bpy < pap.
Details
- Language :
- English
- ISSN :
- 1520-510X
- Volume :
- 54
- Issue :
- 16
- Database :
- MEDLINE
- Journal :
- Inorganic chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 26244848
- Full Text :
- https://doi.org/10.1021/acs.inorgchem.5b01408