Protonation and acylation of the heterometallic complexes (μ-H)Os3(μ-O2CC5H4FeCp)(CO)10 and Fe{(μ-O2CC5H4)(μ-H)Os3(CO)10}2

V. A. Maksakov, I. V. Slovohotova, A. V. Golovin, S. P. Babailov

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Abstract

The reactions of the heterometallic complexes (μ-H)Os3(μ-O2CC5H4FeCp)(CO)10 (1) and Fe{(μ-O2CC5H4)(μ-H)Os3(CO)10}2 (2) with CF3COOH, CF3SO3H, and AcCI were studied. The reaction of 1 with CF3COOH involves interaction with the Cp ligands, protonation of the O atom of the bridging carboxylate group, and oxidative degradation of the complex. At low concentrations, CF3SO3H protonates the O atom of the bridging carboxylate group, while at high concentrations, degradation of the complex takes place. The reaction of complex 2 with either CF3COOH or low concentrations of CF3SO3H results in successive elimination of two [(μ-H)Os3(CO)10] cluster fragments due to protonation of the O atoms of the carboxylate groups. In the case of high CF3SO3H concentrations, the Os-Os bonds of both cluster fragments of 2 are also protonated to give the [Fe{(μ-O2CC5H4)(μ-H)2Os3(CO)10}2]2+ dication. The Friedel-Crafts acylation of 1 takes place only when a large excess of AcCl and AlCl3 is used to give two new complexes, (μ-H)Os3(μ-O2CC5H4FeC5H4C(O)CH3)(CO)10 and (μ-H)Os3(μ-O2CC5H3C(O)CH3 FeCp)(CO)10 in a 2 : 1 ratio.

Original languageEnglish
Pages (from-to)2451-2458
Number of pages8
JournalRussian Chemical Bulletin
Volume50
Issue number12
DOIs
Publication statusPublished - Dec 2001
Externally publishedYes

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Keywords

  • H NMR spectroscopy
  • Acylation
  • Osmium and iron heterometallic complexes
  • Protonation

ASJC Scopus subject areas

  • Chemistry(all)

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