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Iron-Iridium Mixed-Metal Carbonyl Clusters: A Mössbauer Study of the Structure and of the Adsorption of [Fe2Ir2(CO)12]2− on MgO

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Abstract

193Ir and 57Fe Mössbauer spectroscopy was used to investigate the structure of the [Fe2Ir2(CO)12]2- cluster compound and the adsorption of this cluster on hydrated MgO. Supported samples were prepared by impregnation of the magnesia with solutions of [Et4N]2[Fe2Ir2(CO)12] in acetone. The Mössbauer and FT-IR spectra of the MgO-supported cluster confirm that the bimetallic carbonyl is molecularly physisorbed onto MgO without undergoing any transformation or decomposition. The easy solvent extraction of the intact cluster from the oxide surface excludes ion pairing between the cluster anion and the Mg2+ surface sites. Mössbauer spectra are in agreement with the refined structure of the molecular cluster and the temperature dependence of the 57Fe Mössbauer spectra above 80 K is consistent with the low degree of interaction of the cluster with the support. This technique, therefore, appears to be promising in order to infer structural information when X-ray determination fails.

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Authors and Affiliations

  1. Dipartimento di Chimica Fisica, Università Ca' Foscari, Calle Larga S. Marta 2137, I-30123, Venezia, Italy

    L. Stievano & S. Calogero

  2. Centro CNR “CSSCMTBSO” and Dipartimento di Chimica Inorganica, Metallorganica e Analitica, Università degli Studi di Milano, Via G. Venezian 21, I-20133, Milano, Italy

    R. Psaro & M. Guidotti

  3. Dipartimento di Scienze dell'Ambiente e del Territorio, Università degli Studi, Piazza della Scienza 1, I-20126, Milano-Bicocca, Italy

    R. Della Pergola

  4. Physik-Department E 15, Technische Universität München, D-85747, Garching, Germany

    F. E. Wagner

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  1. L. Stievano
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  2. S. Calogero
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  3. R. Psaro
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  4. M. Guidotti
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  5. R. Della Pergola
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  6. F. E. Wagner
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Stievano, L., Calogero, S., Psaro, R. et al. Iron-Iridium Mixed-Metal Carbonyl Clusters: A Mössbauer Study of the Structure and of the Adsorption of [Fe2Ir2(CO)12]2− on MgO. Journal of Cluster Science 12, 123–137 (2001). https://doi.org/10.1023/A:1016675029549

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