The first example of tetraosmium carbonyl clusters containing (μ3-NH) nitrene ligands: Syntheses and crystal structures

Yat Li, Wing Tak Wong, Zhen Yang Lin

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Abstract

The reaction of [Os4(μ-H)4(CO)12] with o-tert-butylhydroxylamine hydrochloride (tBuONH2·HCl) in the presence of trimethylamine-N-oxide (Me3NO) in dichloromethane afforded [Os4-(μ-H)4(CO)11{η1-NH2OtBu}] (1) in high yield. Upon the addition of tetrafluoroboric acid (HBF4) into the solution of 1 in acetonitrile, the novel cationic cluster [Os4(μ-H)4(CO)11(μ-NH2)-(NCMe) ] [BF4] (2) formed. Reaction of 1 with HBF4in the presence of diphenylacetylene gave two geometric isomers, [Os4(μ-H)2(CO)11(μ-NH2){μ- η3-Ph(CHC)Ph}] (3) and [Os4(μ-H)2(CO)11-(μ-NH2)(η1-Ph(CH=C)Ph)] (4). Treatment of 2 with excess Me3NO in acetonitrile gave [Os4-(μ-H)4(CO)10(μ-NH2)(NCMe)2] [BF4] (5). The carbonylation of 2 in the refluxing chloroform afforded the neutral clusters [Os3(μ-H)2(CO)9(μ-NH2)Cl] (6) and [Os4(μ-H)3(CO)12(μ-NH2)] (7). Protonation of 7 with trifluoromethylsulfonic acid, CF3SO3H, gave another cationic cluster, [Os4(μ-H)4(CO)12(μ-NH2)] [CF3SO3] (8), which is an analogue of 2. Refluxing of 7 in toluene under an argon atmosphere afforded [Os4(μ-H)2(CO)12(μ3-NH)] (9), which is the first example of (μ3-NH) nitrene ligands containing tetraosmium carbonyl clusters. The solid-state structures of 2-9 were established by X-ray analysis. The1H NMR properties of these clusters were studied, and a correlation between the chemical shift and the structural geometry was established.
Original languageEnglish
Pages (from-to)1029-1037
Number of pages9
JournalOrganometallics
Volume22
Issue number5
DOIs
Publication statusPublished - 3 Mar 2003
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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