Planarized Triarylboranes: Stabilization by Structural Constraint and Their Plane-to-Bowl Conversion
摘要:
Triphenylborane and 9,10-diphenyl-9,10-dihydro-9,10-diboraanthracene, constrained to a planar arrangement with methylene tethers, were synthesized by intramolecular multi-fold Friedel-Crafts cyclization. These compounds were stable toward air, water, and amines, despite the absence of steric protection in the vertical direction with respect to the B atoms, and showed characteristic structural, electronic, and photophysical properties. In addition, upon treatment with a fluoride ion, these compounds underwent a plane-to-bowl conversion in a controlled manner.
A Radical Anion of Structurally Constrained Triphenylborane
作者:Tomokatsu Kushida、Shigehiro Yamaguchi
DOI:10.1021/om400560u
日期:2013.11.25
the structurally constrained triphenylborane 1 with K produced a radicalanion. EPR analysis demonstrated the delocalization of the unpaired electron spin density over the entire π skeleton to a greater extent than is the case for a nonconstrained Ph3B radicalanion. DFT calculations indicated that the coplanarization of the benzene rings with the boron plane and the shortening of the B–C bond lengths
A discotic liquid‐crystalline (LC) material, consisting of a planarized triphenylborane mesogen, was synthesized. X‐ray diffraction analysis confirmed that this compound forms a hexagonal columnar LC phase with an interfacial distance of 3.57 Å between the discs. At ambient temperature, this boron‐centered discotic liquidcrystal exhibited ambipolar carriertransport properties with electron and hole
合成了由平面化的三苯基硼烷介晶组成的盘状液晶(LC)材料。X射线衍射分析证实,该化合物形成了一个六边形柱状LC相,两个圆盘之间的界面距离为3.57Å。在室温下,这种以硼为中心的盘状液晶显示出双极性载流子传输特性,其电子和空穴迁移率值分别约为10 -3和3×10 -5 cm 2 V -1 s -1。