Identification fine du processus d'isolation électrique de la poudre de fer par action de l'acide phosphorique. Étude de l'influence des paramètres physico-chimiques du milieu sur la qualité des matériaux isolés

Contrat SAPHYR (1992-1993

A bridging side-on allenylidene dimolybdenum complex without carbonyl stabilization

International audienceThe bis(nitrile) complex [Mo2Cp2(μ-SMe)3(NCCH3)2](BF4) (1) reacts with HC⋮CCPh2(OH) to give the μ-alkyne product [Mo2Cp2(μ-SMe)3{HC⋮CCPh2(OH)}](BF4) (2). Sequential treatment with triethylamine and tetrafluoroboric acid converts 2 almost quantitatively, via the μ-alkynyl derivative 3, into [Mo2Cp2(μ-SMe)3(μ-η1:η2-CCCPh2)] (BF4) (4), the first example of a dinuclear μ-η1:η2-allenylidene species without carbonyl ligands

Unexpected coupling of Cp and two RNC ligands at a {Mo-2(mu-SMe)(3)} nucleus

cited By 21International audienceReaction of the bis-isonitrile complex [Mo2-Cp2(μ-SMe)3(t-BuNC)2] (BF4) (1) with n-BuLi (in hexane) produced the dealkylated derivative [Mo2Cp2(μ-SMe)3-(t-BuNC)(CN)] (2) in quantitative yield. However, upon treatment with either NaOH (suspension) or (Me4N)OH (in MeOH), 1 was converted into a mixture of 2 and the μ-alkylidyne species [Mo2Cp(μ-SMe)3μ-(η5-C5 H4)(t-BuN)-CN(t-Bu)C] (3), in which a deprotonated Cp and both isonitrile ligands of 1 are now linked by new carbon-carbon and carbon-nitrogen bonds