酸单作为金属有机框架的碳酸类连接剂
Simon S Iremonger1, Junmei Liang, Ramanathan Vaidhyanathan
1Department of Chemistry, University of Calgary, Calgary T2N 1N4, Canada.
Journal of the American Chemical Society
|November 19, 2011
概括
使用酸单连接器的新金属有机框架 (MOF) 显示出对二氧化碳捕获的前景. 甲基使其具有高二氧化碳吸附性的多孔结构,与其乙基接对应物不同.
科学领域:
- 材料科学 材料科学 材料科学
- 无机化学 无机化学
- 超分子化学 超分子化学
背景情况:
- 双酸酸单是金属有机框架 (MOF) 中常用的二碳酸联结剂的结构模拟物.
- 这些链接器具有位于协调位置附近的氧,可能会影响框架属性.
研究的目的:
- 为了合成和表征3D金属有机框架 (MOF) 材料使用酸单连接剂.
- 研究基长度对这些MOF的结构和气体吸附性质的影响.
主要方法:
- 合成Cu{1,4-二酸 bis{monoalkyl ester)) (CuBDPR) 框架,使用不同的基乙烯 (甲基和乙基).
- 使用X射线衍射和气体吸附分析对产生的MOF结构进行表征.
- 计算建模以了解二氧化碳吸附机制.
主要成果:
- 乙烯结CuBDPR框架被发现是无孔的.
- 甲基连接的CuBDPR框架形成了一个同型,多孔的结构.
- 这种多孔的甲基联MOF表现出显著的二氧化碳捕获能力,具有很高的异质吸附热 (45kJ mol(-1)).
- 计算研究表明,二氧化碳吸收对结构灵活性和带方向的高度敏感性.
结论:
- 在酸单连接剂中选择基极为重要,这对MOF的孔隙性和二氧化碳吸附性能产生了重大影响.
- 甲基连接的CuBDPR代表了用于二氧化碳捕获应用的有希望的材料.
- 结构动态和链接方位是这些MOF中气体吸收的关键因素.
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