146663-24-3Relevant academic research and scientific papers
Expedient Synthesis of a Metallostibine Os2(CO)8(μ-SbPh): An Unusual and Strong Two-Electron-Donor Ligand
Li, Ying-Zhou,Ganguly, Rakesh,Leong, Weng Kee
, p. 2541 - 2546 (2017)
A metallostibine, Os2(CO)8(μ-SbPh) (2), was generated readily and in high yield and purity from the Os3(CO)11(μ-SbPh)(Cl)2 (1) cluster through elimination of the terminal Os(CO)3(Cl)2 Lewis acid fragment with activated γ-alumina. Compound 2 is air sensitive in solution but relatively stable as a solid. The Sb atom in 2 adopts a trigonal pyramidal geometry in both the solid and solution states, with an active lone pair of electrons. Experimental and computational studies show that 2 is a strong two-electron donor with a donor strength comparable to that of alkylphosphines.
Ligand substitution in the osmium carbonyl cluster Os2(CO)8(μ3-SbPh)Os(CO)3(Cl)2: Towards derivatives of the osmostibine metalloligand
Li, Ying-Zhou,Yuan, Zhi-Rui,Ganguly, Rakesh,Li, Yongxin,Rajaratnam, Deborah Roshni,Leong, Weng Kee
, (2021/04/27)
Derivatisation of the osmium carbonyl cluster Os2(CO)8(μ3-SbPh)Os(CO)3(Cl)2, 1, the precursor to the metalloligand Os2(CO)8(μ-SbPh), 2, was explored as a route to derivatives of the latter. The reaction of 1 with PPh3 in different stoichiometries and under trimethylamine N-oxide activation in CH3CN led to mono-, di-, tri- and tetra-substitution by PPh3 and CH3CN. The first substitution occurred at the Os(CO)3Cl2 “spike” and although subsequent substitution favoured CH3CN at the osmostibine moiety, the latter was not readily displaced by PPh3. Substitution at the “spike” also shut down release of the substituted osmostibine. The CH3CN-substituted osmostibine could, however, be generated in situ through the bis-acetonitrile derivative of 1 by conversion of the Os(CO)2(NCCH3)Cl2 “spike” back into its removable Os(CO)3Cl2 form through reaction with CO gas, and was then trapped with W(CO)5(NCCH3).
