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Interfacial and Nanoconfinement Effects Decrease the Excited-State Acidity of Polymer-Bound Photoacids
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DOI：10.1016/j.chempr.2019.04.022.png)
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摘要
En 中文
Photo-initiated ion transport on the nanoscale is relevant to various fields including energy conversion, neuron triggering, and biomimetic processes. To study this phenomenon, we synthesized and evaluated photoacid-modified polymers, which generate hydrated protons in response to visible-light excitation. Pyrenol photoacid dye molecules were covalently bonded within conical nanopores that had been track etched in poly(ethylene terephthalate). The data suggest that similar to 90% of the nanopore surfaces were modified with photoacids and that photoacids were, on average, bound through three sulfonamide groups. In comparison to photoacids dissolved in an aqueous solution, photoacids bound specifically to the nanoporous tip region were, on average, weaker acids in their ground and excited states, which we presume is due to differences in surface potential or solvation environment in the confined nanopores. These results suggest that ion transport initiated by nanoconfined photoacids will require careful molecular engineering to enable efficient light-to-ionic energy conversion.
Keyword:
CURRENT RECTIFICATION
PROTON-TRANSFER
ASYMMETRIC NANOPORES
TRANSPORT-PROPERTIES
NANOFLUIDIC DIODE
BIPOLAR MEMBRANES
SUPER-PHOTOACIDS
ION-TRANSPORT
NANOCHANNELS
LIGHT
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2.8K
被引数:
3.0W
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