Cations, silicon-containing theoretical studies

There have been numerous experimental as well as theoretical studies dealing with the structural and thermochemical properties of cationic silicon hydrides, Si Hm+ , and a detailed discussion of these species would certainly exceed the limited space available. We will therefore confine ourselves to the discussion of only a few exemplary cases. For further information on Si-ion thermochemistry the reader is referred to several reviews on the experimental2-4 as well as computational5 determination of thermodynamic properties of silicon-containing ions. 

Among multiple-bond-containing silicon compounds, neutral HNSi holds a special place. The [H,N,Si] potential energy surface and several possible N- and Si-substituted isomers have formed the subject of several experimentaP " and theoretical investigations . In a recent experimental and theoretical study, the ionic as well as the neutral [H,N,Si] surfaces were explored . Ionization of a mixture of iodosilane and NH3 gives rise to [H,N,Si]+ cations, which according to CA experiments exist in an N-protonated (65) rather than the isomeric Si-protonated form (66). 

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