Abstract

PAEZ MOZO, Edgar Alberto. TRANSFERENCIA DE OXÍGENO FOTOESTIMULADA CON COMPLEJOS DE MO (DIOXO) ANCLADOS EN TIO₂. Rev. acad. colomb. cienc. exact. fis. nat. [online]. 2012, vol.36, n.139, pp.279-286. ISSN 0370-3908.

In this paper, the formation of an Oxygen Transfer (OAT) green bioinspired system was developed. The OAT to and ethylbenzene, using molecular oxygen and UV-Vis light is reported. The catalyst consists of complexes of the type [Mo(=O)₂L], L=bipyriyll(bipi), lbipyrazolyl(bpz) bound to TiO₂. The OAT is stimulated by an electron current, generated by the action of UV-visible light on TiO₂, which is transferred to the Mo = O unit to promote the OAT. The contribution of the superoxide anion O₂^-, formed by the action of the e-photogenerated with O₂, seems to play an important role in regenerating the Mo(= O)₂ active center since in the absence of light OAT is stoichiometric. Although the bipirazolyl is a good OAT agent due to its electron donating property, the system is poor in the activation of oxygen due to its organic media leaching lability, with the ligand Bipi a better balance is obtained. These systems offer a good opportunity to develop green processes for selective oxidation of organic compounds.

Keywords : Dyoxygen; DioxoMolibdenum Complexes; Oxyen Atom Transfer; Titania Anchored Catalysts.

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