Controlling
Supramolecular Chirality of Two-Component
Hydrogels by J- and H‑Aggregation
of Building Blocks
Version 2 2018-05-18, 20:04
Version 1 2018-05-15, 13:51
Posted on 2018-05-18 - 20:04
While
manipulating the helicity of nanostructures is a challenging
task, it attracts great research interest on account of its crucial
role in better understanding the formation mechanisms of helical systems.
For the supramolecular chirality in self-assembly systems, one challenge
is how to understand the origin of supramolecular chirality and inherent
helicity information on nanostructures regulated by functionality-oriented
stacking modes (such as J- and H-aggregation) of building blocks. Herein, two-component hydrogels
were prepared by phenylalanine-based enantiomers and achiral bis(pyridinyl)
derivatives, where helical nanofibers with inverse handedness as well
as controllable helical pitch and diameter were readily obtained through
stoichiometric coassembly of these building blocks. The helix inversion
was achieved by the transition between the J- and H-aggregation of bis(pyridinyl) derivatives, which was collectively
confirmed by circular dichroism, scanning electron microscopy, Fourier
transform infrared spectroscopy, and single X-ray crystallography.
Interestingly, the helical coassemblies with opposite handedness could
be obtained not only from the enantiomeric building blocks but also
from the chiral monomers with the same configurational chirality by
exchanging achiral additives. This work provides insight into the
origin and helicity inversion of supramolecular chirality in molecular
self-assembly systems and may shine light on the precise fabrication
of chiral nanostructures for potential applications in smart display
devices, optoelectronics, and biological systems.
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Liu, Guofeng; Sheng, Jianhui; Wu, Hongwei; Yang, Chaolong; Yang, Guangbao; Li, Yongxin; et al. (2018). Controlling
Supramolecular Chirality of Two-Component
Hydrogels by J- and H‑Aggregation
of Building Blocks. ACS Publications. Collection. https://doi.org/10.1021/jacs.8b03309
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AUTHORS (9)
GL
Guofeng Liu
JS
Jianhui Sheng
HW
Hongwei Wu
CY
Chaolong Yang
GY
Guangbao Yang
YL
Yongxin Li
RG
Rakesh Ganguly
LZ
Liangliang Zhu
YZ
Yanli Zhao