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Modulating heterogeneous microstructure in room temperature ionic liquids(RTILs) by external stimuli is an important approach for understanding anddesigning the external field induced chemical reactions in natural andapplicable systems. Here, we report for the first time the redistribution ofoxygen molecules in RTILs due to laser-induced microstructure changes probed bytriplet excited state dynamics of porphyrin and rotational dynamics of coumarin153. A remarkably long-lived triplet excited state of porphyrin is observed inair-saturated ionic liquid with the changes of microstructure afterirradiation, suggesting that more charge-shifted O2 induced by external laserfield move into the polar domains of ionic liquid [C8mim][PF6] from nonpolardomains through electrostatic interactions. The results presented here suggestthat the heterogeneous systems of ionic liquids upon external stimuli can bedesigned for those oxygen-related chemical reactions with extensiveinspirations for potential applications in lithium-air batteries, gaseoussensing, photoelectrical catalysis and so on.

Probing Laser-induced Microenvironment Changes in Room Temperature Ionic Liquids