Hydration of the yttrium(III) ion in aqueous solution.: An X-ray diffraction and XAFS structural study

被引:72
作者
Lindqvist-Reis, P
Lamble, K
Pattanaik, S
Persson, I [1 ]
Sandström, M
机构
[1] Royal Inst Technol, Dept Chem, S-10044 Stockholm, Sweden
[2] Swedish Univ Agr Sci, Dept Chem, S-75007 Uppsala, Sweden
来源
JOURNAL OF PHYSICAL CHEMISTRY B | 2000年 / 104卷 / 02期
关键词
D O I
10.1021/jp992101t
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The yttrium(III) ion is found by means of extended X-ray absorption fine-structure spectroscopy (EXAFS) and large angle X-ray scattering (LAXS) to be hydrated by eight water molecules in aqueous solution. The EXAFS data show a slightly asymmetric distribution of the Y-O bond distances with the centroid of the distribution at 2.368(5) Angstrom. The width of the distribution implies a positional disorder of about 0.1 Angstrom on top of the thermally induced variation in the Y-O bond distances, The aqueous solutions and the solid compound [Y(OH2)(8)]Cl-3.(15-crown-5), in which eight water oxygen atoms from a distorted bicapped trigonal prism around the hydrated yttrium(III) ion, show very similar neat-edge and EXAFS spectra. For aqueous solutions the LAXS data give a mean Y-O bond distance of 2.365(5) Angstrom and show the presence of a second hydration sphere consisting of approximately 16 oxygen atoms at a mean Y ... O distance of 4.40(4) Angstrom.
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页码:402 / 408
页数:7
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