通过氧化柱[5]芳烃合成了柱[4]芳烃[1]醌衍生物( PQ X s),其在约485 nm处表现出显着的电荷转移(CT)跃迁。成功实现了两对对映体构象异构体的手性拆分。尽管结合亲和力降低, PQ X仍表现出较慢的外消旋动力学。通过将PQ X s 与手性客体络合,实现了具有显着不对称因子的可见光手性光感应。诱导的对映体过量可以通过与非手性客体的竞争性结合来维持,这为手性传感和记忆提供了一种有前途的策略。
Supramolecular enantiomeric and structural differentiation of amino acid derivatives with achiral pillar[5]arene homologs
作者:Jiecheng Ji、Yizhou Li、Chao Xiao、Guo Cheng、Kui Luo、Qiyong Gong、Dayang Zhou、Jason J. Chruma、Wanhua Wu、Cheng Yang
DOI:10.1039/c9cc08541f
日期:——
Complexation of achiral pillar[5]arenes with chiral amines induced strong circular dichroism (CD) signals. The CD responses differed drastically depending on the nature of the aminoacid guest, and they significantly varied and part of them even inverted, upon increasing the length of the alkyl chains of the pillar[5]arenes guests. Accordingly, this tactic allowed for the unprecedented simultaneous
the synthesis of pillar[6]arenes was developed. A series of pillar[6]arenes were prepared with FeCl3 as catalyst and chloroform as solvent at room temperature in moderate yields (30%–40%). Their host-guest properties with n-cetyltrimethyl ammonium bromide were investigated by 1 HNMR. The results showed that high selectivity in the host-guest relationship became apparent between pillar[6]arenes and
and distinct method of preparing pillar[5]arene and pillar[6]arene with high selectivity and efficiency has been achieved by condensation of 1,4-dialkoxybenzene and paraformaldehyde with the choline chloride (ChCl)/ferric chloride (FeCl3) deep eutectic solvent in CH2Cl2 at room temperature. Under the optimal conditions, the yield of pillar[5]arene and pillar[6]arene is 35% and 53%, respectively. The
Complexation of neutral 1,4-dihalobutanes with simple pillar[5]arenes that is dominated by dispersion forces
作者:Xiaoyan Shu、Jiazeng Fan、Jian Li、Xiaoyang Wang、Wei Chen、Xueshun Jia、Chunju Li
DOI:10.1039/c2ob25251a
日期:——
The complexation of neutral 1,4-dihalobutanes with simple pillar[5]arenes was investigated. The results indicate the formation of interpenetrated complexes, where the dispersive interactions dominate the complex stability. Typically, 1,4-diiodobutane displays the strongest binding strength with ethylpillar[5]arene [Ka = (1.0 ± 0.1) × 104 M−1], up to 120 fold as compared with 1,4-difluorobutane.
Highly effective binding of neutral dinitriles by simple pillar[5]arenes
作者:Xiaoyan Shu、Songhui Chen、Jian Li、Zhenxia Chen、Linhong Weng、Xueshun Jia、Chunju Li
DOI:10.1039/c2cc00153e
日期:——
Highly effective binding of neutral dinitriles by simple alkyl-substituted pillar[5]arenes and the formation of interpenetrated geometries are reported. The resulting host–guest complexes represent one of the most efficient recognition motifs based on pillararenes.