SANS and EXAFS study of hierarchical structure assembled by coordination species in biphasic solvent extraction

Motokawa, Ryuhei   ; Kobayashi, Toru ; Endo, Hitoshi*; Suzuki, Shinichi; Yaita, Tsuyoshi; Shiwaku, Hideaki   

The aim of this study is to elucidate a hierarchical structure of Zr(NO)(2TBP) in octane, formed in an organic phase of the biphasic solvent extraction system, where TBP is tri-n-butyl phosphate. The combined method of extended X-ray adsorption fine structure (EXAFS) and small-angle scattering (SAS), exhibiting a good compatibility in the viewpoint of observing length scale, were employed in this study. EXAFS and SAS are capable of covering the length scales from 0.1-1 nm and 1-100 nm, respectively, reflecting a single coordination structure of Zr(NO)(2TBP) complex and its self-assembly. Note that we need to combine the data obtained for both methods in order to proceed with our understandings of the overall hierarchical structure. In this paper, we would like to report the overall picture of the self-assembled structure into a wide length scale and introduce an original insight into the treatment of EXAFS and SAS profiles.