An “electron lock” toward the photochromic activity of phenylacetylene appended bisthienylethene was written by Li, Xiaochuan;Cai, Qiongyan;Zhang, Junna;Kim, Hyorim;Son, Young-A.. And the article was included in Molecular Crystals and Liquid Crystals in 2020.Name: 2,5-Dimethylthiophene The following contents are mentioned in the article:
Photochromic core structure of BTEs was configured in the design of (2,3-Bis(2,5-dimethylthiophen)-5-phenylethynylthiophene) and (2,3-Bis(2,5-dimethylthiophen)-5-(4-methoxyphenyl)-1,3-butadiene-1,1,4,4-tetracarbonitrile). exhibits regular photochromic behavior in hexane when excited with UV (254 nm) and visible light (>400 nm). The solution can be cycled between pink colors and colorless. Correspondingly, with a more electron-withdrawing group attached, the photochromic reactivity was totally quenched. It is the lowered electron d. on reactive carbon atoms in LUMO that influence the photochromism, which is one of the key elements to photochromism. Apart from the distance between reactive atoms, electron distribution on reactive atoms is another important key to the configuration of photochromic dyes. This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8Name: 2,5-Dimethylthiophene).
2,5-Dimethylthiophene (cas: 638-02-8) belongs to benzothiophene derivatives. Functionalized benzothiophenes are important constructs found in molecules with wide ranging biological activity and in organic materials. It is found within the chemical structures of pharmaceutical drugs such as raloxifene, zileuton, sertaconazole, and also BTCP.Name: 2,5-Dimethylthiophene
Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem