Photochromism of three supramolecular assemblies derived from benzenecarboxylate donors and viologen acceptors
| Autor: | Guo-zheng Zhao, Jing Li, Jin-jian Liu |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
010405 organic chemistry Chemistry Supramolecular chemistry Viologen Crystal structure Electron acceptor 010402 general chemistry 01 natural sciences Acceptor 0104 chemical sciences Dication Inorganic Chemistry Photochromism Photosensitivity Polymer chemistry Materials Chemistry medicine Physical and Theoretical Chemistry medicine.drug |
| Zdroj: | Polyhedron. 161:237-242 |
| ISSN: | 0277-5387 |
| DOI: | 10.1016/j.poly.2019.01.014 |
| Popis: | Based on 1,2,4,5-benzenetetracarboxylic acid (H4BTEC) and different viologen cations (MQ+ = 1-methyl-4,4′-bipyridinium cation; MV2+ = 1,1′-bis(methyl)-4,4′-bipyridinium dication; EV2+ = 1,1′-bis(ethyl)-4,4′-bipyridinium dication), three novel supramolecular assemblies [(H3O)(MQ)(H4BTEC)(H2BTEC)]·H2O (1), (H3O)(MV)0.5(BTEC)0.5 (2), (H3O)(EV)0.5(H2BTEC) (3), have been synthesized and structurally characterized with viologen cations as the guest and acid moieties acting as the host. The crystal structures and photochromic properties of three compounds have been explored. Similar to other viologen-based materials, compounds 2 and 3 are found to exhibit electron-transfer (ET) photochromism, while compound 1 has no photochromism observed. The photosensitivity of the compounds should be due to the rational modulation of electron acceptors and donors. Controllably fabricating appropriate donor and acceptor units at the molecular level in photosensitive materials is critical to the development of new photochromic host–guest materials. |
| Databáze: | OpenAIRE |
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