Structure analysis of adsorbed molecules or ions at liquid-liquid interface by total-reflection X-ray absorption spectroscopy

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XAFS (X-ray absorption fine structure) technique has been applied to the local structure analysis of solvated ions or molecules. Total-reflection fluorescence-XAFS (TR-XAFS) method has been developed and improved for the observations of their structures in situ at the liquid-liquid interface.The amount of adsorbed bromide ions at DTAB aqueous solution-hexane interface has been estimated from XAFS jump height at Br K edge using this TR-XAFS apparatus. It was clear that the adsorption behavior of bromide ions at water-hexane interface was different from that at the aqueous solution surface.The molecular orientation of hydrophobic ZnTPP at heptane-water interface was studied byTR-XAFS method taken horizontal and vertical polarizations of synchrotron radiation.