Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/2251
Título: Synthesis and structural characterization of iron complexes with 2,2,2-tris(1-pyrazolyl)ethanol ligands: Application in the peroxidative oxidation of cyclohexane under mild conditions
Autor: Silva, Telma F. S.
Silva, M. Fátima Guedes da
Mishra, Gopal S.
Martins, Luísa Margarida D. R. S.
Pombeiro, Armando J. L.
Palavras-chave: Cyclohexane
Scorpionates
Iron
Catalysis
Oxidation
X-ray diffraction
Copper triethanolamine complexes
Organic molecular-crystals
Hidrogen-peroxide
Catalytic-activity
Rhenium complexes
Water clusters
Hydrocarbon oxygenations
Coordination chemistry
Alkane hydroxylation
ZN-II
Data: 15-Mar-2011
Editora: Elsevier Science SA
Citação: SILVA, Telma F. S.; GUEDES DA SILVA, M. Fátima; MISHRA, Gopal S.; MARTINS, Luísa M. D. R. S.; POMBEIRO, Armando J. L. - Synthesis and structural characterization of iron complexes with 2,2,2-tris(1-pyrazolyl)ethanol ligands: Application in the peroxidative oxidation of cyclohexane under mild conditions. Journal of Organometallic Chemistry. ISSN 0022-328X. Vol. 696, n.º 6 (2011) p.1310-1318.
Resumo: The reactions of FeCl2 center dot 2H(2)O and 2,2,2-tris(1-pyrazolyl) ethanol HOCH2C(pz)(3) (1) (pz = pyrazolyl) afford [Fe{HOCH2C(pz)(3)}(2)][FeCl4]Cl (2), [Fe{HOCH2C(pz)(3)}(2)](2)[Fe2OCl6](Cl)(2)center dot 4H(2)O (3 center dot 4H(2)O), [Fe{HOCH2C(pz)(3)}(2)] [FeCl{HOCH2C(pz)(3)}(H2O)(2)](2)(Cl)(4) (4) or [Fe{HOCH2C(pz)(3)}(2)]Cl-2 (5), depending on the experimental conditions. Compounds 1-5 were isolated as air-stable crystalline solids and fully characterized, including (1-4) by single-crystal X-ray diffraction analyses. The latter technique revealed strong intermolecular H-bonds involving the OH group of the scorpionate 2 and 3 giving rise to 1D chains which, in 3, are further expanded to a 2D network with intercalated infinite and almost plane chains of H-interacting water molecules. In 4, intermolecular pi center dot center dot center dot pi interactions involving the pyrazolyl rings are relevant. Complexes 2-5 display a high solubility in water (S-25 degrees C ca. 10-12 mg mL(-1)), a favourable feature towards their application as catalysts (or catalyst precursors) for the peroxidative oxidation of cyclo-hexane to cyclohexanol and cyclohexanone, with aqueous H2O2/MeCN, at room temperature (TON values up to ca. 385). (C) 2011 Elsevier B. V. All rights reserved.
Peer review: yes
URI: http://hdl.handle.net/10400.21/2251
ISSN: 0022-328X
Aparece nas colecções:ISEL - Eng. Quim. Biol. - Artigos

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