Mechanically induced single-molecule white-light emission of excited-state intramolecular proton transfer (ESIPT) materials
| Autor: | Yudong Yang, Rongchuan Su, You Ran, Jingsong You, Quan Huang, Jingbo Lan, Zhengyang Bin, Qiang Guo |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Light Proton Process Chemistry and Technology Intermolecular force Infrared spectroscopy Crystallography X-Ray Photochemistry Fluorescence chemistry.chemical_compound chemistry Mechanics of Materials Intramolecular force Solvents Molecule General Materials Science Gases Protons Electrical and Electronic Engineering Single crystal Oxazole |
| Zdroj: | Materials Horizons. 8:1499-1508 |
| ISSN: | 2051-6355 2051-6347 |
| Popis: | Described herein is the first example of mechanically induced single-molecule white-light emission based on excited-state intramolecular proton transfer (ESIPT) materials. The mechanism of mechanochromism is clearly disclosed by powder and single crystal X-ray diffraction (XRD) data, infrared spectroscopy, and fluorescence up-conversion measurement, etc. 2-(2'-Hydroxyphenyl)oxazole (6b) with a herringbone packing motif exhibits a predominant keto-form emission, giving off yellowish-green fluorescence. Mechanical grinding transforms the herringbone packing motif into a brickwork packing motif, decreases the intermolecular distances, which results in an enhanced intermolecular charge-transfer interaction, and therefore changes the ESIPT dynamics, leading to an enhanced enol-form emission and white fluorescence. Herringbone-packing 6b is thermodynamically more stable than brickwork-packing 6b. Thus, the latter can convert to the former by solvent fuming or thermal annealing. |
| Databáze: | OpenAIRE |
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