Reversible Deprotonation and Protonation Behaviors of a Tetra-Protonated 纬-Keggin Silicodecatungstate
详细信息 查看全文
- 作者：Kosei Sugahara ; Shinjiro Kuzuya ; Tomohisa Hirano ; Keigo Kamata ; Noritaka Mizuno
- 刊名：Inorganic Chemistry
- 出版年：2012
- 出版时间：July 16, 2012
- 年：2012
- 卷：51
- 期：14
- 页码：7932-7939
- 全文大小：517K
- 年卷期：v.51,no.14(July 16, 2012)
- ISSN：1520-510X
文摘
The potentiometric titration of a 纬-Keggin tetra-protonated silicodecatungstate, [纬-SiW10O34(H2O)2]4鈥?/sup> (H4路I), with TBAOH (TBA = [(n-C4H9)4N]+) showed inflection points at 2 and 3 equiv of TBAOH. The 1H, 29Si, and 183W NMR data suggested that the in situ formation of tri-, doubly-, and monoprotonated silicodecatungstates, [纬-SiW10O34(OH)(OH2)]5鈥?/sup> (H3路I), [纬-SiW10O34(OH)2]6鈥?/sup> (H2路I), and [纬-SiW10O35(OH)]7鈥?/sup> (H路I), with C1, C2v, and C2 symmetries, respectively. Single crystals of TBA6路H2路I suitable for the X-ray structure analysis were successfully obtained and the anion part was a monomeric 纬-Keggin divacant silicodecatungstate with two protonated bridging oxygen atoms. Compounds H3路I, H2路I, and H路I were reversibly monoprotonated to form H4路I, H3路I, and H2路I, respectively.