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Surface Mediated Organometallic Synthesis: Formation of [H5Os10(CO)24]− by Hydrogenation of Silica-Supported [Os(CO)3(OH)2]n as a Springboard for a High-Yield Synthesis of [H4Os10(CO)24]2− Starting from α-[Os(CO)3Cl2]2 and Working in Ethylene Glycol Solution

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Abstract

New high yield routes to the high nuclearity hydrido carbonyl clusters [H5Os10(CO)24]- and [H4Os10(CO)24]2-, model systems for the chemisorption of CO and H2 on metal surfaces, are reported. [H5Os10(CO)24]- is obtained in good yields by hydrogenation (1 atm) at 200°C of physisorbed [Os(CO)3(OH)2]n whereas in refluxing ethylene glycol solution, that is less acidic than the silica surface, [H4Os10(CO)24]2- is obtained in high yield starting from [Os(CO)3(OH)2]n or, more conveniently, from α-[Os(CO)3Cl2]2 in the presence of the stoichiometric amount of sodium carbonate. The quantitative equilibrium

$$[{\text{H}}_{\text{4}} {\text{Os}}_{{\text{10}}} ({\text{CO}})_{24} ]^{2 - } \mathop {\underset { + {\text{H}}^{\text{ + }} } \leftrightarrows }\limits^{ + {\text{OH}}^ - } {\text{ }}[{\text{H}}_{\text{5}} {\text{Os}}_{{\text{10}}} ({\text{CO}})_{24} ]^ -$$

is confirmed.

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Authors and Affiliations

  1. Dipartimento di Chimica Inorganica, Metallorganica e Analitica dell'Università di Milano, Via G. Venezian 21, I-20133, Milano, Italy

    Elena Lucenti, Dominique Roberto, Carmen Roveda & Renato Ugo

  2. Centro CNR “CSSSCMTBSO,”, Via G. Venezian 21, I-20133, Milano, Italy

    Elena Cariati

Authors
  1. Elena Lucenti
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  2. Dominique Roberto
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  3. Carmen Roveda
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  4. Renato Ugo
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  5. Elena Cariati
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Lucenti, E., Roberto, D., Roveda, C. et al. Surface Mediated Organometallic Synthesis: Formation of [H5Os10(CO)24]− by Hydrogenation of Silica-Supported [Os(CO)3(OH)2]n as a Springboard for a High-Yield Synthesis of [H4Os10(CO)24]2− Starting from α-[Os(CO)3Cl2]2 and Working in Ethylene Glycol Solution. Journal of Cluster Science 12, 113–122 (2001). https://doi.org/10.1023/A:1016623012711

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