Journal of Cluster Science

, Volume 12, Issue 4, pp 595–617 | Cite as

Chemistry of Tetraosmium Carbonyl Clusters with Phenylazopyridine Ligands: Synthesis, Structure and Electrochemistry

  • Yat Li
  • Wing-Tak Wong
Article

Abstract

Two new tetraosmium carbonyl clusters [Os4(μ-H)4(CO)11{η1-NC5H4(N=N)C6H5}] (1) and [Os4(μ-H)4(CO)10{η2-NC5H4(N=N)C6H5}] (2) were synthesized from the reaction of [Os4(μ-H)4(CO)12] with two equivalent of 2-phenylazopyridine ligand in dichloromethane at ambient temperature using trimethylamine-N-oxide as the decarbonylation reagent. Subsequent chromatographic purification led to the isolation of 1and 2as stable orange and blue solids in respectively 25 and 13% yields. Complex 1converted to 2in a 25% yield in refluxing chloroform. Treating a solution of [Os4(μ-H)4(CO)12] in dichloromethane with two equivalent of 3-phenylazopyridine led to the formation of another two new clusters [Os4(μ-H)4(CO)11{η1-NC5H4(N=N)C6H5}] (3) and [Os4(μ-H)4(CO)10(NMe3){η1-NC5H4(N=N)C6H5}] (4), which could be isolated as yellow solids in 34% and 21% yields respectively. Thermolysis of 3or 4in refluxing n-hexane gives [Os4(μ-H)3(CO)10{μ-η3-NC5H3(N=N)C6H5}] (5) in 24 and 33% yields respectively. Their electronic absorption properties and electrochemical behavior are also reported.

electrochemistry phenylazopyridine osmium carbonyl cluster 

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Copyright information

© Plenum Publishing Corporation 2001

Authors and Affiliations

  • Yat Li
    • 1
  • Wing-Tak Wong
    • 1
  1. 1.Department of ChemistryThe University of Hong KongPeople's Republic of China

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