Ion-Gated Synthetic Photosystems
| Autor: | Sandra Ward, Pierre Charbonnaz, Naomi Sakai, Stefan Matile |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
010405 organic chemistry
Chemistry Photochemistry Charge (physics) Nanotechnology Protonation General Chemistry Electron 010402 general chemistry 01 natural sciences Biochemistry Catalysis 0104 chemical sciences Ion Indium tin oxide Colloid and Surface Chemistry Photoinduced charge separation Polymerization Chemical physics ddc:540 Ion Channel Gating Photosystem |
| Zdroj: | JOURNAL OF THE AMERICAN CHEMICAL SOCIETY Journal of the American Chemical Society, Vol. 136, No 15 (2014) pp. 5575-5578 J. Am. Chem. Soc. |
| ISSN: | 0002-7863 |
| DOI: | 10.1021/ja501389g |
| Popis: | Herein, molecular strings of ions built along charge-transporting channels are shown to dramatically increase photocurrents and enable charge transport over long distances, thus confirming the existence and significance of ion-gated photosystems. For their synthesis, ordered and oriented stacks of naphthalenediimides were grown on indium tin oxide by ring-opening disulfide-exchange polymerization. To these charge-transporting channels, coaxial strings of anions or cations-fixed, mobile, complete, partial, pure, or mixed-were added by orthogonal hydrazone exchange. The presence of partially protonated carboxylates was found to most significantly increase activity, implying that they both attract holes and repel electrons, that is, facilitate photoinduced charge separation and hinder charge recombination at the same time. As a result of this quite remarkable situation, photocurrents increased rather than decreased with increasing charge stabilization on their "stepping stones." The presence of mobile anions facilitated long-distance charge transport through thick films. Turned off by inhibited anion mobility, that is, proton hopping, hole/proton antiport is identified to account for long-distance charge transport in ion-gated photosystems. |
| Databáze: | OpenAIRE |
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