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Type: Artigo de periódico
Title: Determination of electron paramagnetic resonance parameters for osmium(III) low-spin systems using graphical solutions
Author: Medina, AN
Gandra, FG
Baesso, ML
Lima, JB
McGarvey, BR
Franco, DW
Abstract: Optical absorption and electron paramagnetic resonance (EPR) results for the low-spin compounds [Os(NH3)(5)L][O3SCF3](n) [L = 4,4'-dithiodipyridine (dtdp) or H2O, n = 3; L = O3SCF3, n = 2] are reported. The EPR powder spectrum is analysed and from the three:experimental g values the crystal-held parameters and the energy levels are determined. The negative sign obtained for the axial splitting in [Os(NH3)(5)(dtdp)][O3SCF3] has been interpreted to be the result of an Os-III --> L back-bonding interaction. The IR optical spectrum shows a broad band at 2080 nm that is compared to the estimate obtained from the EPR results. Analytical expressions for the crystal-field parameters and energy levels of the system are derived. In addition, an alternative graphical method which simplifies the estimation of ligand-field parameters from the EPR parameters is presented.
Country: Inglaterra
Editor: Royal Soc Chemistry
Citation: Journal Of The Chemical Society-faraday Transactions. Royal Soc Chemistry, v. 93, n. 11, n. 2105, n. 2111, 1997.
Rights: aberto
Identifier DOI: 10.1039/a700034k
Date Issue: 1997
Appears in Collections:Unicamp - Artigos e Outros Documentos

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