Chloride complexation of Zr and Hf in HCl investigated by extended X-ray absorption fine structure spectroscopy: Toward characterization of chloride complexation of element 104, rutherfordium (Rf)

Hiromitsu Haba, Kazuhiko Akiyama, Kazuaki Tsukada, Masato Asai, Atsushi Toyoshima, Tsuyoshi Yaita, Masaru Hirata, Keisuke Sueki, Yuichiro Nagame

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Abstract

Chloride complexation of the group-4 elements Zr and Hf in 8.011.9M HCl is investigated by extended X-ray absorption fine structure (EXAFS) spectroscopy to characterize chloro complexes of the transactinide element, rutherfordium (Rf). The complexes of Zr and Hf successively vary with the concentration of HCl from a hydrated complex [M(H 2O) 8] 4+ at 8.0M to a hexachloro complex [MCl 6] 2- at 11.9M (M = Zr and Hf). The present structural changes of the Zr and Hf complexes well reflect the previously studied anion-exchange behavior of Zr and Hf in HCl. From both the EXAFS and anion-exchange results, we suggest that Rf forms the same complexes as those of Zr and Hf in HCl, and that the complexation strength of the hexachloro complexes of the group-4 elements, [MCl 6] 2- (M = Zr, Hf, and Rf), is in the sequence of Rf > Zr > Hf.

Original languageEnglish
Pages (from-to)698-703
Number of pages6
JournalBulletin of the Chemical Society of Japan
Volume82
Issue number6
DOIs
Publication statusPublished - 2009

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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