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Bis(3,5-dimethylpyrazol-1-yl)acetate bound to titania and complexed to molybdenum dioxido as a bidentate N,N′-ligand. Direct comparison with a bipyridyl analog in a photocatalytic arylalkane oxidation by O2

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Abstract

Bis(3,5-dimethylpyrazol-1-yl)acetate, well known as a tridentate N,N,O ligand, was bound to MoO2Cl2 in a bidentate N,N manner by anchoring covalently, at first, the ligand onto a titanium oxide surface, followed by its complexation with the molybdenum dioxo entity. It was fully characterized by 13CPMAS NMR and FT-IR spectroscopy. The tethered complex was directly compared with an analogous bipyridyl species in the catalytic ethylbenzene oxidation by O2 at room temperature, atmospheric pressure, and under visible light. The bis(pyrazol-1-yl) catalyst exhibited a significant initial higher oxygen atom transfer (OAT) capability, well in accord with its electron donating property. It was, unfortunately, hampered by a premature leaching phenomenon, totally absent in the comparable bipyridyl system.

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Acknowledgments

Part of this work was performed under the auspices of COLCIENCIAS (Fondo Apoyo a Doctorados Nacionales) and supported by the project DIEF UIS 5166 of the Universidad Industrial de Santander.

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Authors and Affiliations

  1. Facultad de Química Ambiental, Grupo de Investigaciones Ambientales para el Desarrollo Sostenible-GIADS, Universidad Santo Tomas, Campus Universitario Floridablanca, Santander, Colombia

    Nelson J. Castellanos

  2. Escuela de Química, Centro de Investigación en Catálisis-CICAT, Universidad Industrial de Santander, Km 2 vía El Refugio, Piedecuesta, Santander, Colombia

    Nelson J. Castellanos, Fernando Martínez & Edgar A. Páez-Mozo

  3. FR1739 CNRS, Aix-Marseille Université, Campus St Jérôme, 13397, Marseille, France

    Fabio Ziarelli

  4. Chirosciences UMR CNRS 7313 Institut des Sciences Moléculaires de Marseille (iSm2), Aix-Marseille Université, Campus St Jérôme, 13397, Marseille, France

    Nelson J. Castellanos & Henri Arzoumanian

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  1. Nelson J. Castellanos
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  2. Fernando Martínez
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  3. Edgar A. Páez-Mozo
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  4. Fabio Ziarelli
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  5. Henri Arzoumanian
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Correspondence to Nelson J. Castellanos or Henri Arzoumanian.

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Castellanos, N.J., Martínez, F., Páez-Mozo, E.A. et al. Bis(3,5-dimethylpyrazol-1-yl)acetate bound to titania and complexed to molybdenum dioxido as a bidentate N,N′-ligand. Direct comparison with a bipyridyl analog in a photocatalytic arylalkane oxidation by O2 . Transition Met Chem 37, 629–637 (2012). https://doi.org/10.1007/s11243-012-9631-2

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  • DOI: https://doi.org/10.1007/s11243-012-9631-2

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