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Enhanced and Optically Switchable Proton Conductivity in a Melting Coordination Polymer Crystal
Sanjog S Nagarkar1, Satoshi Horike1, Tomoya Itakura2
1Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Yoshida, Sakyo-ku, Kyoto, 606-8501, Japan.
Angewandte Chemie (International Ed. in English)
|April 11, 2017
Summary
This study enhances proton conductivity in coordination polymers (CPs) by doping with acids in a molten state. Light-responsive molecules enable optical switching of this conductivity, offering new material control possibilities.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Supramolecular Chemistry
Background:
- Proton conductivity in solid-state materials is crucial for energy applications.
- Coordination polymers (CPs) offer tunable structures for functional properties.
- Controlling proton conductivity dynamically remains a challenge.
Purpose of the Study:
- To enhance proton conductivity in a 1D coordination polymer (CP).
- To achieve optically switchable proton conductivity using photo-responsive molecules.
- To explore the use of CP melting for functionalization and property control.
Main Methods:
- Doping a 1D CP, [Zn(HPO4)(H2PO4)2](ImH2)2, with triflic acid in its melt state.
- Incorporating the photo acid pyranine into the melted CP.
- Investigating proton conductivity changes via optical irradiation.
Main Results:
- Acid doping significantly enhanced proton conductivity in the CP.
- Doping with pyranine enabled reversible, light-mediated switching of conductivity.
- The molten state of the CP proved effective for incorporating dopants and defects.
Conclusions:
- Melting behavior of CPs is a viable strategy for enhancing and controlling proton conductivity.
- Photo-responsive dopants allow for optical switching of bulk properties.
- This approach offers a novel route for designing functional solid-state materials.