Abstract
Photochromic core structure, triangle terthiophene, is configured to the design of 2,3-Bis(2,5-dimethylthiophen)-5-methoxyphenylethynylthiophene (PT) and 2,3-Bis(2,5-dimethylthiophen)-5-(4-methoxyphenyl)-1,3-butadiene-1,1,4,4-tetracarbonitrile(MPT) and characterized by NMR and HRMS technology. The photochromic behavior is investigated in typical solvents. With PT in hexane, reversibly photochromic process is induced by alternative irradiation of UV and Visible light. The solution color of PT can be toggled between colorless and pink, forming a switch cycle. In chloroform, the photochromic wavelength moves to shorter wavelength side. For MPT, UV light induced photochromism is not observed. Due to the addition of tetracarbonitrile, its strong electron-withdrawing character significantly lowers the electron density on reactive carbon atoms in LUMO, which is one of the key elements to support the photoactive of photochromism. Therefore, the molecular configuration of electron distribution is important to the design of photochromic dyes.
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