期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 144, 期 8, 页码 3510-3516出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.1c12028
关键词
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资金
- National Key R&D Program of China [2018YFE0115000]
- National Natural Science Foundation of China [22174073, 22003027]
- NSF of Tianjin City [21JCJQJC00010]
- Haihe Laboratory of Sustainable Chemical Transformations, Beijing National Laboratory for Molecular Sciences [BNLMS202106]
- Frontiers Science Center for New Organic Matter at Nankai University [63181206]
This study presents the remarkable results of the spontaneous and ultrafast reduction-induced degradation of viologen compounds in water microdroplets. It suggests that microdroplets may function as naturally occurring tiny electrochemical cells for unique redox reactions.
Water serves as an inert environment for the dispersion and application of many kinds of herbicides. Viologen compounds, a type of widely used but highly toxic herbicide, are stable in bulk water, whose half-life can be up to 23 weeks in natural water, imposing a severe health risk to mammals. In this study, we present the striking results of the spontaneous and ultrafast reduction-induced degradation of three viologen compounds in water microdroplets and provide the concentration, time, temperature dependence, mechanism, and scale-up of the reactions. We postulate that the electrons existing at the air-water interface of the microdroplets due to the unique redox potential therein initiate the reduction, from which further degradation occurs. The host-guest complexation between cucurbit[7]uril and viologens only slightly changes the redox potential of viologens in the bulk but completely inhibits the reactions in microdroplets, adding to the uniqueness of the redox potentials at the air-water interfaces of microdroplets. Taken together, microdroplets might have been functioning as naturally occurring ubiquitous tiny electrochemical cells for a plethora of unique redox reactions that were thought to be impossible in the bulk water.
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