A stable silaborene: Synthesis and characterization
A stable silaborene: Synthesis and characterization
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DOI：
10.1021/ja0570741
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发表时间：
2006-01-18
影响因子：
15
通讯作者：
Sekiguchi, A
中科院分区：
文献类型：
--
作者：
Nakata, N;Sekiguchi, A
1，1-二锂硫代硅烷(1)与二氯(2，2，6，6-四甲基哌啶)硼烷在甲苯中反应，合成了一种稳定的硅-−-硼双键化合物--硅硼烯(2)。2的X-射线单晶分析表明>；SiB−N<；骨架几乎是线性的(176.87(13)°)，其Si−B键长为1.8379(17)ä，比典型的Si−B单键短约10%。硅硼烯2与三甲基硅炔锂在二甲醚中于60℃反应生成相应的硅硼烯(4-·[Li(DME)3]+)，其红橙色晶体作为溶剂分离离子对。4-·[Li(Dme)3]+的X射线分析表明，Si−B的键长(1.933(3)？)比2的长，但仍短于典型的Si−B单键。这些结构特征表明，4-具有双键性质，涉及>；SiB<；-共振结构。
A stable silicon−boron doubly bonded compound, silaborene (2), was synthesized by the reaction of 1,1-dilithiosilane (1) with dichloro(2,2,6,6-tetramethylpiperidino)borane in toluene. The X-ray crystallographic analysis of2revealed that the >SiB−N< framework is almost linear (176.87(13)°) with an Si−B bond length of 1.8379(17) Å, which is about 10% shorter than typical Si−B single bonds. The silaborene2reacted with lithium trimethylsilylacetylide at 60 °C in DME to give the corresponding silaborenide (4-·[Li(dme)3]+), whose reddish-orange crystals were isolated as the solvent separated ion pair. The X-ray analysis of4-·[Li(dme)3]+showed that the Si−B bond length (1.933(3) Å) is longer than that of2, but still shorter than typical Si−B single bonds. These structural features indicate that4-has double bond character involving the >SiB<-resonance structure.