Room-Temperature Synthesis of UiO-66 and Thermal Modulation of Densities of Defect Sites

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• 作者：Matthew R. DeStefanoTimur Islamoglu ; Sergio J. GaribayJoseph T. Hupp ; Omar K. Farha
• 刊名：Chemistry of Materials
• 出版年：2017
• 出版时间：February 14, 2017
• 年：2017
• 卷：29
• 期：3
• 页码：1357-1361
• 全文大小：383K
• ISSN：1520-5002

文摘

UiO-66 is an archetypal zirconium-based metal–organic framework (MOF) that is constructed from hexanuclear zirconium oxide clusters as secondary building units (SBUs) and 1,4-benzenedicarboxylate (bdc) linkers. For the first time, a room-temperature solution-based synthesis is reported for UiO-66 and several of its derivatives, UiO-66-X (X = NH₂, OH, or NO₂), resulting in materials that are as porous and crystalline as those made at elevated temperatures. In addition, via modulation of the temperature at which UiO-66 is synthesized, the number of defect sites can be varied. It was found through N₂ sorption isotherm analysis and potentiometric acid–base titrations that increasing the synthesis temperature from 25 to 130 °C results in a systematic decrease in the number of defect sites in UiO-66. The results suggest that, with respect to this synthetic procedure, a maximal number of defect sites is achieved [∼1.3 missing linkers per Zr₆O₄(OH)₄(bdc)₆] at a temperature of 45 °C.