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A Recyclable Trinuclear Bifunctional Catalyst Derived from a Tetraoxo Bis-Zn(salphen) Metalloligand

Authors

  • Dr. Martha V. Escárcega-Bobadilla,

    1. Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans 16, 43007–Tarragona (Spain), Fax: (+34) 977920828
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  • Dr. Marta Martínez Belmonte,

    1. Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans 16, 43007–Tarragona (Spain), Fax: (+34) 977920828
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  • Eddy Martin,

    1. Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans 16, 43007–Tarragona (Spain), Fax: (+34) 977920828
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  • Eduardo C. Escudero-Adán,

    1. Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans 16, 43007–Tarragona (Spain), Fax: (+34) 977920828
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  • Prof. Dr. Arjan W. Kleij

    Corresponding author
    1. Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans 16, 43007–Tarragona (Spain), Fax: (+34) 977920828
    2. Catalan Institute for Research and Advanced Studies (ICREA), Pg. Lluis Companys 23, 08010–Barcelona (Spain)
    • Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans 16, 43007–Tarragona (Spain), Fax: (+34) 977920828
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Abstract

A tetraoxo bis-Zn(salphen) supramolecular host can bind various divalent metal salts, thereby providing access to trinuclear bifunctional systems that incorporate both Lewis acid sites and dynamically bound nucleophilic anions. The formation of these trinuclear species was investigated and their stability features were also determined. The application of these trinuclear complexes as bifunctional catalysts was evaluated in the formation of cyclic organic carbonates from epoxides and CO2. The catalytic data, in combination with control experiments, clearly demonstrate that these trinuclear compounds show much higher recycling potential compared to various control compounds and they can be used in up to five cycles without an observable loss in activity. Furthermore, this new recyclable catalytic system does not require any additives and can be applied under solvent-free conditions.

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