描述了基于各自的苯基和噻吩基硅烷核的一系列二硼酸和三硼酸的合成。最佳方案包括使用去质子化锂化或与正丁基锂进行卤素/锂交换,对各个芳基硅烷前体进行锂化,然后用B(O i -Pr)3处理所得中间体,然后进行水解,从而以高收率得到最终产物。确定了选定的二硼酸酯衍生物的X射线晶体结构,表明B(OH)2基团的氢键相互作用是控制超分子组装的主要因素。
描述了基于各自的苯基和噻吩基硅烷核的一系列二硼酸和三硼酸的合成。最佳方案包括使用去质子化锂化或与正丁基锂进行卤素/锂交换,对各个芳基硅烷前体进行锂化,然后用B(O i -Pr)3处理所得中间体,然后进行水解,从而以高收率得到最终产物。确定了选定的二硼酸酯衍生物的X射线晶体结构,表明B(OH)2基团的氢键相互作用是控制超分子组装的主要因素。
A series of luminescent molecules were presented employing the tetrahedral structural motif of the silicon atom, which further connected different N-containing heterocycle functional groups in their periphery using phenyl rings as the bridges. These compounds included three kinds of N-heterocycle functional silanes: imidazole derivatives (1a-h), pyrazole derivatives (2a-e) and benzimidazole derivatives (3a-b), and their structures were fully characterized by FT-IR, H-1 NMR, C-13 NMR and HRMS. The TGA results indicate that they all exhibit high thermal stabilities. The photophysical properties demonstrate that they are fluorescent in the violet-blue region and could be potentially applied as blue emitters for organic light-emitting diodes (OLEDs). The effect factors of sort, disposition and number of substituent groups and N-containing heterocycle functional groups on their thermal and photophysical properties were investigated. Molecular calculations were also performed to support the experimental results. Moreover, the computational results reveal that these compounds all exhibit relatively large HOMO-LUMO band gaps with the range from 4.82 eV (2d) to 5.19 eV (1a and 2c), making them become promising candidates as host materials for emitters and hole/electron blocking materials in OLEDs display. (C) 2013 Elsevier B.V. All rights reserved.