Tuning the (Chir)Optical Properties and Squeezing out the Inherent Chirality in Polyphenylene‐Locked Helical Carbon Nanorings
作者:Jinyi Wang、Hong Shi、Shengda Wang、Xinyu Zhang、Pengwei Fang、Yu Zhou、Gui‐Lin Zhuang、Xiang Shao、Pingwu Du
DOI:10.1002/chem.202103828
日期:2022.3
This study reports the precise synthesis and tuning size-dependent (chir)opticalproperties of chiral distorted acenes ([n]CPPAn2,6; n=6–8). Efficient resolutions for chiral enantiomers with (P)/(M)-helicity were achieved only when the size is small. These enantiomers showed strong chiroptical properties and dissymmetry factors (|gabs| and |glum|∼0.01 for an enantiomer of [6]CPPAn2,6).
本研究报告了手性扭曲并苯 ( [n]CPPAn 2,6 ; n=6-8)的精确合成和调整尺寸依赖性 (chir) 光学特性。仅当尺寸较小时,才能实现具有 ( P )/( M )-螺旋度的手性对映异构体的有效分离。这些对映体表现出很强的手性和不对称因素(对于[6]CPPAn 2,6的对映体,| g abs | 和| g lum |∼0.01 )。
Synthesis, Characterization, and Crystal Structure of [6]Cycloparaphenylene
作者:Jianlong Xia、Ramesh Jasti
DOI:10.1002/anie.201108167
日期:2012.3.5
Strained: [6]Cycloparaphenylene, a molecule with 97 kcal mol−1 of strain energy, was synthesized. The synthetic strategy relied on two sequential oxidative dearomatization/addition sequences and a final reductive aromatization reaction (see scheme). The optoelectronic properties of [6]cycloparaphenylene were measured, and the analysis of the X‐ray crystalstructure revealed a linear packing geometry
Tethering of a stereogenic Tröger's base to a curved hexaparaphenylene has led to the synthesis of the homochiral nanohoop TB[6]CPP. This nanohoop possesses a C2 symmetrical structure, which gives rise to pale blue emission with a high quantum yield of ca. 0.69 and shows chiroptical properties, especially circular polarized luminescence with a moderate dissymmetry factor (|glum|) of 2.1×10−3.
将立体异构的 Tröger 碱基束缚在弯曲的六对亚苯基上,合成了纯手性纳米环TB[6]CPP 。该纳米环具有C 2对称结构,可发出浅蓝色发射,量子产率高达约。 0.69并显示出手性光学性质,特别是具有2.1×10 -3的中等不对称因子(| g lum |)的圆偏振发光。
Modulation of [8]CPP properties by bridging two phenylene units
We report the synthesis and characterization of twonew fluorophores, consisting of a [8]cyclo-para-phenylene core in which two phenylenes are bridged either by a nitrogen atom or by a carbonyl group. Nitrogen bridge increases the HOMO-LUMO gap, whereas the carbonyl bridge decreases it. These results provides interesting guidelines to control the electronic properties of nanohoops.