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Iron complexes containing electrochemically active diazocycle-bis(di-tert-butyl-phenol) ligands

Content Provider	Scientific Electronic Library Online (SciELO)
Author	Mendes, Luísa L. Fernandes, Christiane Franco, Roberto W. A. Lube, Leonardo M. Wei, Sheng-Hsuan Reibenspies, Joseph H. Darensbourg, Donald J. Horn Jr., Adolfo
Abstract	Four N, O-donor ligands built on diazocycle platforms and containing bis(di-tert-butyl-phenol) as pendant arms were employed in the synthesis of iron(III) complexes, resulting in four mononuclear and one dinuclear complexes. The ligands are distinct with respect to the diazocycle backbone: piperazine (H2L1), diazepane/homopiperazine (H2L2), hexahydropyrimidine (H2L3) or hexahydropyrimidin-5-ol (H3L4). The molecular structure of compounds [FeL2Cl], 2, and [Fe2(L4)(HL4)Cl], 4, were solved by single crystal X-ray diffraction analysis. Electrochemical data showed that, in addition to the electrochemical process centered on the metal, the compounds show ligand-centered redox processes. Coulometric studies with concomitant UV-Vis analyses confirmed that compound 2 generated the phenoxyl species, while electron paramagnetic resonance (EPR) spectroscopy confirmed the radical formation for compounds 2, 4 and 5. Of interest was the observation that the compound in which the ligand can be oxidized easiest is the one where the metal center shows the lowest Lewis acidity.
Related Links	http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0103-50532014000600009&lng=en&nrm=iso http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532014000600009&lng=en&nrm=iso
Starting Page	1050
Ending Page	1061
Page Count	12
File Format	PDF
ISSN	01035053
DOI	10.5935/0103-5053.20140078
Journal	Journal of the Brazilian Chemical Society
Issue Number	6
Volume Number	25
Language	English
Publisher	Sociedade Brasileira de Química
Publisher Date	2014-06-01
Publisher Institution	Universidade Estadual do Norte Fluminense Darcy Ribeiro Laboratório de Ciências Químicas Universidade Estadual do Norte Fluminense Darcy Ribeiro Laboratório de Ciências Físicas Instituto Federal Fluminense Texas A & M University Department of Chemistry
Publisher Place	Brazil USA
Access Restriction	Open
Subject Keyword	Phenoxyl radical Iron compounds Diazocycle Tert-butylphenol Non-innocent ligand
Content Type	Text
Resource Type	Article
Subject	Chemistry

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