Cyclotrimetallenes: Bridged and Distorted Structures

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• 作者：Bal&aacute ; zs Pinté ; r ; Andr&aacute ; s Olasz ; Kl&aacute ; ra Petrov ; Tam&aacute ; s Veszpré ; mi
• 刊名：Organometallics
• 出版年：2007
• 出版时间：July 16, 2007
• 年：2007
• 卷：26
• 期：15
• 页码：3677 - 3683
• 全文大小：185K
• 年卷期：v.26,no.15(July 16, 2007)
• ISSN：1520-6041

文摘

The geometry and the energetic aspects of the stable isomers of trimetallenes (X₂YR₄: X, Y = Si, Ge)were investigated, and some exotic di- and monobridge structures were found. Many of the bridge structureswere identified as stable intermediates or transition states during the two-step substituent migrationreactions. The effect of bulky substituents on the stability and geometry of the monobridge structureswas studied. The bulkier bridging substituents cause a larger deviation from the ideal bridge structure.SiH₃ and Si(SiH₃)₃ substituents confer a direct benefit on the bridge geometry, in spite of their bulkiness,via electronic effects. According to these results and considering the electronic effect of the Si(SiC_nH_m)₃-type substituents, there is hope to synthesize bridge silicon compounds with bulky substituents.