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The hydration state of phosphotungstic acid (H 3 PW 12 O 40 ) was explored through the use of in situ Fourier transform infrared (FT-IR) spectroscopy, water sorption microcalorimetry, and density functional theory (DFT) quantum chemical calculations. In addition, the proton affinities of the various sites on the Keggin unit were evaluated. The small differences (<10kJmol...
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