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Gas‐phase silane oligomerization by the isovalent rare earth ions Sc + , Y + and Lu +

1992; Wiley; Volume: 6; Issue: 4 Linguagem: Inglês

10.1002/rcm.1290060417

1097-0231

Maurizio Azzaro, Sylvie Breton, M. Decouzon, Serge Géribaldi,

Organoboron and organosilicon chemistry

Abstract The gas‐phase reactions between silane and three isovalent metal ions Sc + , y + and Lu + are investigated using a Fourier‐transform ion cyclotron resonance mass spectrometer. In contrast to its carbon analogue methane, silane exhibits very different behaviour towards these three metal ions. Lu + is unreactive sdtowards silane even with a translational activation of the metal ion. The reaction is slow and endothermic with Sc + . It leads first to the formation of ScH + , and ScSIH , and then to the formation fo ScSiH . Slow sequential reactions are observed with the ion ScSiH to give ScSi n H , ScSi n H , ScSi n H and ScSi up to a value of n=3. By contrast to Sc + , only the emtal silylene ion YSiH is observed in the tirst step of the rapid and exothermic reaction of Y + with silane. YSiH then undergoes a rapid sequintial reaction to give YSi n H and YSi n H , ions up to a value of n=7.