In Situ X-ray Absorption Spectroscopy Studies of Kinetic Interaction between Platinum(II) Ions and UiO-66 Series Metal–Organic Frameworks
| Autor: | Tian Wei Goh, Yuchen Pei, Wenyu Huang, Zhiyong Guo, Kyle Brashler, Chaoxian Xiao |
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| Rok vydání: | 2014 |
| Předmět: |
X-ray absorption spectroscopy
Extended X-ray absorption fine structure Absorption spectroscopy Chemistry Coordination number Inorganic chemistry chemistry.chemical_element Surfaces Coatings and Films Adsorption Materials Chemistry Physical chemistry Metal-organic framework Physical and Theoretical Chemistry Absorption (chemistry) Platinum |
| Zdroj: | The Journal of Physical Chemistry B. 118:14168-14176 |
| ISSN: | 1520-5207 1520-6106 |
| DOI: | 10.1021/jp5066456 |
| Popis: | The interaction of guest Pt(II) ions with UiO-66-X (X = NH2, H, NO2, OMe, F) series metal-organic frameworks (MOFs) in aqueous solution was investigated using in situ X-ray absorption spectroscopy. All of these MOFs were found to be able to coordinate with Pt(II) ions. The Pt(II) ions in UiO-66-X MOFs generally coordinate with 1.6-2.4 Cl and 1.4-2.4 N or O atoms. We also studied the time evolution of the coordination structure and found that Pt(II) maintained a coordination number of 4 throughout the whole process. Furthermore, the kinetic parameters of the interaction of Pt(II) ions with UiO-66-X series MOFs (X = NH2, H, NO2, OMe, F) were determined by combinational linear fitting of extended X-ray absorption fine structure (EXAFS) spectra of the samples. The Pt(II) adsorption rate constants were found to be 0.063 h(-1) for UiO-66-NH2 and 0.011-0.017 h(-1) for other UiO-66-X (X = H, NO2, OMe, F) MOFs, which means that Pt(II) adsorption in UiO-66-NH2 is 4-6 times faster than that in other UiO-66 series MOFs. FTIR studies suggested that the carboxyl groups could be the major host ligands binding with Pt(II) ions in UiO-66 series MOFs, except for UiO-66-NH2, in which amino groups coordinate with Pt(II) ions. |
| Databáze: | OpenAIRE |
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