Abstract
AbstractProtons play crucial roles in the interactions between heteropolyanions (HPAs) in aqueous solutions and solid acid salts. We report the aggregation behaviours of Keggin HPAs near the surfaces of heteropolyacid solutions. The structure of the aggregated HPA layer near the solution–vapour phase boundary closely resembles the solid‐state crystal structure of the heteropolyacids in which the HPAs are connected by Zundel ions. The resemblance not only implicates the presence of protons in the form of planar Zundel ions near the air‐water interface but, also, suggests that these align parallel to the interface. This study demonstrates an indirect means of assessing the impact of protons on HPA interactions near air‐water interfaces and, in general, provides new insights about interfacial proton chemistry of heteropolyacids.
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