论文部分内容阅读
据英国 New Scientist 1992年4月11日报道,宾夕法尼亚州立大学卡斯尔曼(W.Castleman)和他的同事在研究碳氢化合物的脱氢作用时偶然发现一种新的化合物,即金属团簇 Ti_8C_(12),它具有单一的传导性能,可用于制造微型信息贮存仪器。研究人员在高温下将甲烷分子与钛原子接触制成钛团簇,然后用质谱技术分析反应产物。质谱技术显示,最丰富的反应产物的化学分子式为Ti_8C_(12)。若用其他碳氢化合物,如乙烯、乙炔和苯来代替甲烷,总是出现同样的反应产物。卡斯尔曼指出,Ti_8C_(12)的排列呈足球状,具有最稳定的结构,其中每个5边形有2个钛原子和3个碳原子。在金属团簇Ti_8C_(12)中,钛原子扩散的电子轨道能解除碳原子键间的应力,因此,Ti_8C_(12)非常稳定,可以经受住较小分子的碰撞。(韦禾)
According to the British New Scientist reported on April 11, 1992, W.Castleman of Pennsylvania State University and his colleague occasionally discovered a new compound when studying the dehydrogenation of hydrocarbons, ie, metal clusters Ti_8C_ (12), which has a single conductivity, can be used to manufacture miniature information storage devices. The researchers contacted methane molecules with titanium atoms at high temperatures to make titanium clusters, and then analyzed the reaction products by mass spectrometry. Mass spectrometry shows that the chemical formula of the most abundant reaction product is Ti_8C_ (12). The same reaction will always occur if other hydrocarbons such as ethylene, acetylene, and benzene are used in place of methane. Casselman pointed out that the arrangement of Ti 8 C 12 is football-like and has the most stable structure, in which each pentagon has 2 titanium atoms and 3 carbon atoms. In metal clusters Ti_8C_ (12), the electron orbitals diffused by titanium atoms can release the stress between carbon atoms. Therefore, Ti_8C_ (12) is very stable and can withstand the collisions of smaller molecules. (Wei Wo)