轨道能级差
硼烷
化学
共轭体系
离域电子
电子受体
位阻效应
亚苯基
环番
光化学
结晶学
三氟甲基
立体化学
分子
有机化学
晶体结构
烷基
聚合物
催化作用
作者
Nurcan Baser‐Kirazli,Roger A. Lalancette,Frieder Jäkle
标识
DOI:10.1002/anie.202001904
摘要
Abstract We introduce a new boron‐doped cyclophane, the hexabora[1 6 ]cyclophane B6‐ F Mes , in which six tricoordinate borane moieties alternate with short conjugated p ‐phenylene linkers. Exocyclic 2,4,6‐tris(trifluoromethyl)phenyl ( F Mes) groups serve not only to further withdraw electron density but at the same time sterically shield the boron atoms, resulting in a macrocycle that is both highly electron‐deficient and stable. The optical and electronic properties are compared with those of related linear oligomers and the electronic structure is further evaluated by computational methods. The studies uncover unique properties of B6‐ F Mes , including a low‐lying and extensively delocalized LUMO and a wide HOMO–LUMO gap, which arise from the combination of a cyclic π‐system, strong electronic communication between the closely spaced borons, and the attachment of electron‐deficient pendent groups. The binding of small anions to the electron‐deficient macrocycle and molecular model compounds is investigated and emissive exciplexes are detected in aromatic solvents.
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