In Situ X-ray Absorption Spectroscopy Studies of Kinetic Interaction between Platinum(II) Ions and UiO-66 Series Metal鈥揙rganic Frameworks

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• 作者：Chaoxian Xiao ; Tian Wei Goh ; Kyle Brashler ; Yuchen Pei ; Zhiyong Guo ; Wenyu Huang
• 刊名：Journal of Physical Chemistry B
• 出版年：2014
• 出版时间：December 11, 2014
• 年：2014
• 卷：118
• 期：49
• 页码：14168-14176
• 全文大小：357K
• ISSN：1520-5207

文摘

The interaction of guest Pt(II) ions with UiO-66鈥揦 (X = NH₂, H, NO₂, OMe, F) series metal鈥搊rganic 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鈥揦 MOFs generally coordinate with 1.6鈥?.4 Cl and 1.4鈥?.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鈥揦 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^鈥? for UiO-66鈥揘H₂ and 0.011鈥?.017 h^鈥? for other UiO-66鈥揦 (X = H, NO₂, OMe, F) MOFs, which means that Pt(II) adsorption in UiO-66鈥揘H₂ is 4鈥? 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鈥揘H₂, in which amino groups coordinate with Pt(II) ions.