Metastable and collision-induced fragmentation studies of all C4H12Si+ isomers; a systematic study of structure-reactivity relations |
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| Authors: | Dovas A Saulys Cornelis E C A Hop Donald F Gaines |
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| Institution: | 1. ogDepartment of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, 53706, Madison, WI, USA
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| Abstract: | Metastable ion (MI) and collision-induced dissociation (CID) mass spectra have been recorded and compared for all nine C4H12Si+. isomers. The (Me)4Si+., t-BuSiH 3 +. , s-BuSiH 3 + , and (Me)2EtSiH+. isomers have unique MI and CID mass spectra. The MI mass spectra, including the kinetic energy release values, of (Me)(i-Pr)SiH 2 +. and (Me)(n-Pr)SiH 2 +. are identical, which implies isomerization. MI data also suggest that a fraction of the n-BuSiH 3 +. ions rearrange into branched (Me)2EtSiH+. ions and a fraction of the n-BuSiH 3 +. ions rearrange into branched s-BuSiH 3 +. ions. A comparison with the isomeric C5H 12 +. pentanes reveals a crucial difference: H2 loss occurs for n-BuSiH 3 +. , i-BuSiH 3 +. , s-BuSiH 3 +. , (Me)(n-Pr)SiH 2 +. , (Me)(i-Pr)SiH 2 +. , and Et2SiH 2 +. , but not for any of the C5Hi 12 +. isomers. Generation of four- or five-membered silicon containing rings is suggested for H2 loss from the C4H12Si+. silanes. |
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