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A Reversible Photoacid Switched by Different Wavelengths of Light
ChemPhotoChem ( IF 3.0 ) Pub Date : 2020-12-07 , DOI: 10.1002/cptc.202000256 Osamah Alghazwat 1 , Adnan Elgattar 2 , Yi Liao 3 , Hajar Alharithy 4
ChemPhotoChem ( IF 3.0 ) Pub Date : 2020-12-07 , DOI: 10.1002/cptc.202000256 Osamah Alghazwat 1 , Adnan Elgattar 2 , Yi Liao 3 , Hajar Alharithy 4
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Reversible photoacids have been widely used in different areas for control of proton‐driven processes with light. Previously reported reversible photoacids rely on thermal relaxation to return to the low‐acidity ground state. Herein we report a photoacid that can be switched between low‐acidity and high‐acidity states by different wavelengths of light. The photoacid can be converted into a high‐acidity metastable state by 470 nm irradiation. The thermal relaxation of the metastable state is very slow and its half‐life in DMSO is 55 h. Irradiation with 365 nm light quickly induced the reverse reaction and reached a photostationary state. UV/Vis absorption spectra of the forward and reverse processes induced by 470 nm and 365 nm irradiation, respectively, have well‐matched isosbestic points. No decomposition was observed after the photoacid was switched by the two wavelengths of light for many cycles. Reversible patterning with both writing and erasing steps performed with light was demonstrated using a polymer thin film containing the photoacid and chlorophenol red as the proton acceptor.
中文翻译：
通过不同波长的光转换的可逆光酸
可逆光酸已广泛用于不同领域，以控制光的质子驱动过程。先前报道的可逆光酸依靠热弛豫返回低酸度基态。在本文中，我们报告了一种光酸，可以通过不同的光波长在低酸度状态和高酸度状态之间切换。通过470 nm的照射，光酸可转变为高酸度的亚稳态。亚稳态的热弛豫非常慢，其在DMSO中的半衰期为55 h。365 nm的光照射迅速引起了逆反应，并达到了光平稳状态。分别由470 nm和365 nm辐照引起的正向和反向过程的UV / Vis吸收光谱具有良好匹配的等密度点。在光酸被两个波长的光切换许多周期后，未观察到分解。使用含有光酸和氯酚红作为质子受体的聚合物薄膜，证明了在光的写入和擦除步骤下可逆图案化。
更新日期：2020-12-07
中文翻译：
通过不同波长的光转换的可逆光酸
可逆光酸已广泛用于不同领域，以控制光的质子驱动过程。先前报道的可逆光酸依靠热弛豫返回低酸度基态。在本文中，我们报告了一种光酸，可以通过不同的光波长在低酸度状态和高酸度状态之间切换。通过470 nm的照射，光酸可转变为高酸度的亚稳态。亚稳态的热弛豫非常慢，其在DMSO中的半衰期为55 h。365 nm的光照射迅速引起了逆反应，并达到了光平稳状态。分别由470 nm和365 nm辐照引起的正向和反向过程的UV / Vis吸收光谱具有良好匹配的等密度点。在光酸被两个波长的光切换许多周期后，未观察到分解。使用含有光酸和氯酚红作为质子受体的聚合物薄膜，证明了在光的写入和擦除步骤下可逆图案化。
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