Reversible Deprotonation and Protonation Behaviors of a Tetra-Protonated ﾎｳ-Keggin Silicodecatungstate
| Autor: | Sugahara, Kosei, Kuzuya, Shinjiro, Hirano, Tomohisa, Kamata, Keigo, Mizuno, Noritaka. |
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| Rok vydání: | 2012 |
| Předmět: |
biology
Structure analysis Stereochemistry Potentiometric titration Protonation biology.organism_classification Medicinal chemistry Nmr data Inorganic Chemistry Bridging oxygen chemistry.chemical_compound Deprotonation Monomer chemistry lacunary gamma Keggin tungstosilicate prepn crystal structure protonation deprotonation Tetra Physical and Theoretical Chemistry |
| Zdroj: | Inorganic Chemistry. 51:7932-7939 |
| ISSN: | 1520-510X 0020-1669 |
| DOI: | 10.1021/ic3010773 |
| Popis: | The potentiometric titration of a γ-Keggin tetra-protonated silicodecatungstate, [γ-SiW(10)O(34)(H(2)O)(2)](4-) (H(4)·I), with TBAOH (TBA = [(n-C(4)H(9))(4)N](+)) showed inflection points at 2 and 3 equiv of TBAOH. The (1)H, (29)Si, and (183)W NMR data suggested that the in situ formation of tri-, doubly-, and monoprotonated silicodecatungstates, [γ-SiW(10)O(34)(OH)(OH(2))](5-) (H(3)·I), [γ-SiW(10)O(34)(OH)(2)](6-) (H(2)·I), and [γ-SiW(10)O(35)(OH)](7-) (H·I), with C(1), C(2v), and C(2) symmetries, respectively. Single crystals of TBA(6)·H(2)·I suitable for the X-ray structure analysis were successfully obtained and the anion part was a monomeric γ-Keggin divacant silicodecatungstate with two protonated bridging oxygen atoms. Compounds H(3)·I, H(2)·I, and H·I were reversibly monoprotonated to form H(4)·I, H(3)·I, and H(2)·I, respectively. |
| Databáze: | OpenAIRE |
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