State Key Laboratory of Medicinal Chemical Biology and Research Center for Analytical Sciences, College of Chemistry, Nankai University, 94 Weijin Road, Tianjin 300071, China.
Talanta. 2012 Sep 15;99:944-50. doi: 10.1016/j.talanta.2012.07.063. Epub 2012 Aug 2.
Isostructural metal-organic frameworks (MOFs) MIL-100(Fe) and MIL-100(Cr), which have identical organic linker and Mobil Thirty-Nine zeolitic type, but different metal ions, were exploited as stationary phases for capillary gas chromatographic separation of alkane isomers. MIL-100(Fe) coated capillary column showed great capability and high efficiency for the gas chromatographic separation of alkane isomers without the need of temperature-programming, while MIL-100(Cr) coated capillary column gave poor performance for the separation. The separation performance of MIL-100(Fe) coated capillary column was even better than commercial HP-5MS and GS-GasPro capillary columns. The determined McReynolds constants, adsorption enthalpies and entropies showed that MIL-100(Fe) coated capillary column gave relatively weaker interaction with alkane isomers than MIL-100(Cr) coated capillary column. The relative standard deviations of repeatability for C7 alkane isomers on MIL-100(Fe) coated capillary column were 0.06-0.16%, 1.1-1.5%, 2.8-3.0% and 2.1-2.4% for retention time, half peak width, peak height and peak area, respectively.
同结构的金属有机骨架（MOFs） MIL-100（Fe）和 MIL-100（Cr）具有相同的有机配体和 Mobil Thirty-Nine 沸石型，但金属离子不同，被用作烷烃异构体毛细管气相色谱分离的固定相。MIL-100（Fe）涂覆的毛细管柱具有出色的能力和高效的烷烃异构体的气相色谱分离能力，无需温度编程，而 MIL-100（Cr）涂覆的毛细管柱的分离性能较差。MIL-100（Fe）涂覆的毛细管柱的分离性能甚至优于商业的 HP-5MS 和 GS-GasPro 毛细管柱。测定的麦克雷因斯常数、吸附焓和熵表明，MIL-100（Fe）涂覆的毛细管柱与烷烃异构体的相互作用相对较弱，而 MIL-100（Cr）涂覆的毛细管柱则较弱。MIL-100（Fe）涂覆的毛细管柱上 C7 烷烃异构体的重复性相对标准偏差分别为保留时间、半峰宽、峰高和峰面积的 0.06-0.16%、1.1-1.5%、2.8-3.0%和 2.1-2.4%。
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