1. The Intramolecular Charge Transfer Mechanism by Which Chiral Self-Assembled H 8 -BINOL Vesicles Enantioselectively Recognize Amino Alcohols.
- Author
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Wang R, Song K, Wei Z, Sun Y, Sun X, and Hu Y
- Subjects
- Stereoisomerism, Fluorescent Dyes chemistry, Kinetics, Molecular Structure, Models, Molecular, Naphthols, Amino Alcohols chemistry, Hydrogen Bonding
- Abstract
The chiral H
8 -BINOL derivatives R- 1 and R- 2 were efficiently synthesized via a Suzuki coupling reaction, and they can be used as novel dialdehyde fluorescent probes for the enantioselective recognition of R/S-2-amino-1-phenylethanol. In addition, R- 1 is much more effective than R- 2 . Scanning electron microscope images and X-ray analyses show that R- 1 can form supramolecular vesicles through the self-assembly effect of the π-π force and strong hydrogen bonding. As determined via analysis, the fluorescence of the probe was significantly enhanced by mixing a small amount of S-2-amino-1-phenylethanol into R- 1 , with a redshift of 38 nm, whereas no significant fluorescence response was observed in R-2-amino-1-phenylethanol. The enantioselective identification of S-2-amino-1-phenylethanol by the probe R- 1 was further investigated through nuclear magnetic titration and fluorescence kinetic experiments and DFT calculations. The results showed that this mechanism was not only a simple reactive probe but also realized object recognition through an ICT mechanism. As the intramolecular hydrogen bond activated the carbonyl group on the probe R- 1 , the carbonyl carbon atom became positively charged. As a strong nucleophile, the amino group of S-2-amino-1-phenylethanol first transferred the amino electrons to a carbonyl carbocation, resulting in a significantly enhanced fluorescence of the probe R- 1 and a 38 nm redshift. Similarly, S-2-amino-1-phenylethanol alone caused severe damage to the self-assembled vesicle structure of the probe molecule itself due to its spatial structure, which made R- 1 highly enantioselective towards it., Competing Interests: The authors declare no conflicts of interest.- Published
- 2024
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