The formation of t-butyl substituted polyhedral silsesquioxanes (POSS) starting from the corresponding silanetriol is reported. Several intermediates involved in this complex condensation process could be identified spectroscopically. In addition, the initial condensation intermediate t-Bu2Si2O(OH)4, as well as t-Bu6Si6O9 and t-Bu7Si7O9(OH)3, could be characterized by X-ray crystallography. Owing to the high crystal quality it was possible to experimentally determine the geometric parameters of the unusual cyclic hydrogen bond network in a dimeric POSS trisilanol for the first time. Furthermore, we investigated the structural changes concomitant with dimer formation/dissociation of the t-butyl substituted POSS trisilanol and its methyl analogue.
报告了从相应的
硅烷三醇开始形成叔丁基取代的多面体
硅倍半氧烷(POSS)的过程。通过光谱分析可以确定参与这一复杂缩合过程的几种中间产物。此外,初始缩合中间产物t-Bu2Si2O(OH)4以及t-Bu6Si6O9和t-Bu7Si7O9(OH)3可以通过X射线晶体学进行表征。由于晶体质量高,首次通过实验确定了二聚体POSS三
硅醇中异常的环状氢键网络的几何参数。此外,我们还研究了伴随叔丁基取代的POSS三
硅醇及其甲基类似物二聚体形成/解离的结构变化。