A stable compound containing a silicon-silicon triple bond

A stable compound containing a silicon-silicon triple bond
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DOI:
10.1126/science.1102209
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发表时间:
2004-09-17
期刊:
影响因子:
56.9
通讯作者:
Ichinohe, M
Ichinohe, M
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Sekiguchi, A;Kinjo, R;Ichinohe, M

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2,2,3,3-四溴-1,1,4,4-四[双在四氢呋喃中,用四当量的钾石墨(KC 8)与1,4,4-二异丙基四硅烷反应,生成1,1,4,4-四[双(三甲基甲硅烷基)甲基(三甲基甲硅烷基)甲基]-1,4-二异丙基-2-四硅炔,一种具有硅-硅三键的稳定化合物,其可以作为祖母绿绿色晶体分离出来,在没有空气的情况下在高达100 ℃下稳定。Si=Si三键长度(及其估计的标准偏差)为2.0622(9)埃,这表明与烯烃相比,炔的键缩短幅度为一半。与炔不同,Si=Si基团上的取代基不是以线性方式排列,而是以137.44(4)度的键角反式弯曲。
The reaction of 2,2,3,3-tetrabromo-1,1,4,4-tetrakis [bis(trimethylsilyl)methyl]1,4-diisopropyltetrasilane with four equivalents of potassium graphite (KC8) in tetrahydrofuran produces 1,1,4,4-tetrakis[bis(trimethylsilyl)methyl]-1,4-diisopropyl-2-tetrasilyne, a stable compound with a silicon-silicon triple bond, which can be isolated as emerald green crystals stable up to 100 C in the absence of air. The Si=Si triple-bond length (and its estimated standard deviation) is 2.0622(9) angstroms, which shows half the magnitude of the bond shortening of alkynes compared with that of alkenes. Unlike alkynes, the substituents at the Si=Si group are not arranged in a linear fashion, but, are trans-bent with a bond angle of 137.44(4)degrees.