Photoresponsive Soft Materials Based on Reversible Proton Transfer

Liao, Yi; Wang, Zhuozhi

doi:10.1002/9783527816774.ch14

Cited by 2 publications

(2 citation statements)

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“…At a constant temperature and a constant intensity of light, the reverse reaction rate is inversely proportional to the photo-generated proton concentration. [35] Unless a very high intensity of light is applied, a fast reverse process will inevitably reduce the proton concentration, which is the reason why it is difficult to achieve a high proton concentration using excited state photoacids. If a high proton concentration is needed, accelerating the reverse process can only be achieved by heating the system after irradiation, which has much less spatial and temporary control than photo-irradiation.…”

Section: Introductionmentioning

confidence: 99%

“…The reverse reaction rate is determined by the structure of the photoacids. At a constant temperature and a constant intensity of light, the reverse reaction rate is inversely proportional to the photogenerated proton concentration [35] . Unless a very high intensity of light is applied, a fast reverse process will inevitably reduce the proton concentration, which is the reason why it is difficult to achieve a high proton concentration using excited state photoacids.…”

Section: Introductionmentioning

confidence: 99%

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A Reversible Photoacid Switched by Different Wavelengths of Light

et al. 2021

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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 highacidity 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.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%