伪-ScVSe2O8, 尾-ScVSe2O8, and ScVTe2O8: New Quaternary Mixed Metal Oxides Composed of Only Second-Order Jahn鈥揟eller Distortive Cations
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- 作者：Yeong Hun Kim ; Dong Woo Lee ; Kang Min Ok
- 刊名：Inorganic Chemistry
- 出版年：2013
- 出版时间：October 7, 2013
- 年：2013
- 卷：52
- 期：19
- 页码：11450-11456
- 全文大小：452K
- 年卷期：v.52,no.19(October 7, 2013)
- ISSN：1520-510X
文摘
Three new quaternary scandium vanadium selenium/tellurium oxides, 伪-ScVSe2O8, 尾-ScVSe2O8, and ScVTe2O8 have been synthesized through hydrothermal and standard solid-state reactions. Although all three reported materials are stoichiometrically similar, they exhibit different crystal structures: 伪-ScVSe2O8 has a three-dimensional framework structure consisting of ScO6, VO6, and SeO3 groups. 尾-ScVSe2O8 reveals another three-dimensional framework composed of ScO7, VO5, and SeO3 polyhedra. ScVTe2O8 shows a layered structure with ScO6, VO4, and TeO4 polyhedra. Interestingly, the constituent cations, that is, Sc3+, V5+, Se4+, and Te4+ are all in a distorted coordination environment attributable to second-order Jahn鈥揟eller (SOJT) effects. Complete characterizations including infrared spectroscopy, elemental analyses, thermal analyses, dipole moment calculation, and the magnitudes of out-of-center distortions for the compounds are reported. Transformation reactions suggest that 伪-ScVSe2O8 may change to 尾-ScVSe2O8, and then to Sc2(SeO3)3路H2O under hydrothermal conditions.