Infrared and raman studies on the phase structure of barium ethyl(octyl)phosphate-water system

Miyagai, Kiyotaka; Taga, Keijiro; Yoshida, Tadayoshi; Okabayashi, Hirofumi; Nishio, Etsuo

doi:10.1007/bf00660305

Cited by 5 publications

(1 citation statement)

References 29 publications

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“…According to the polarization selection rule, the peaks centered at 2880, 2946, and 2963 cm −1 can be assigned to CH 3 symmetric stretching (CH 3 -SS), CH 3 Fermi resonance (CH 3 -FR), and CH 3 asymmetric stretching (CH 3 -AS), respectively; while the peaks centered at 2850 and 2865 cm −1 are attributed to the symmetric stretching mode of CH 2 groups (CH 2 -SS) 42 . Based on the principle of the inductive effect 43 , the peaks centered at 2850 and 2865 cm −1 can be attributed to the symmetric stretching of CH 2 groups in the alkyl chain and glutamate unit. However, neither the chiral SFG signal nor the achiral SFG signal of the =C-H stretching vibration (central peak at 3046 cm −1 ) of the anthracene group of the L -GAn and D -GAn molecules could be observed.…”

Section: Resultsmentioning

confidence: 99%

Direct observation of long-range chirality transfer in a self-assembled supramolecular monolayer at interface in situ

Zhang

Qin²,

Zhu³

et al. 2022

Nat Commun

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Due to the interest in the origin of life and the need to synthesize new functional materials, the study of the origin of chirality has been given significant attention. The mechanism of chirality transfer at molecular and supramolecular levels remains underexplored. Herein, we study the mechanism of chirality transfer of N, N’-bis (octadecyl)-L-/D-(anthracene-9-carboxamide)-glutamic diamide (L-/D-GAn) supramolecular chiral self-assembled at the air/water interface by chiral sum-frequency generation vibrational spectroscopy (chiral SFG) and molecular dynamics (MD) simulations. We observe long-range chirality transfer in the systems. The chirality of Cα-H is transferred first to amide groups and then transferred to the anthracene unit, through intermolecular hydrogen bonds and π-π stacking to produce an antiparallel β-sheet-like structure, and finally it is transferred to the end of hydrophobic alkyl chains at the interface. These results are relevant for understanding the chirality origin in supramolecular systems and the rational design of supramolecular chiral materials.

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Section: Resultsmentioning

confidence: 99%