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Crystalline metal-organic framework (MOF) compounds have recently attracted much attention because of their unique properties such as crystalline and microporous structure and high thermal stability up to around 400 °C1)~3). Generally, MOF compounds are prepared with a multi-valent metal cation in the corner position and dior tri-carboxylic acids as a bridging unit (linker)4). MOFs of desired physical and chemical properties may be designed and synthesized by using various metal cations and carboxylic acids3). MOFs with unique properties have potential for various applications such as adsorbents, catalysts, and so on. In particular, MOFs are expected to act as lightweight hydrogen storage materials5)~9) due to their extremely high specific surface areas reaching to 6000 m2 g1. Recently, MOFs have been studied as catalysts10)~12) and widely reviewed13)~16). MOFs have also been tested for separation of aromatics17)~20) and aliphatic hydrocarbons21)~23). Investigation of adsorption and diffusion of benzene on chromiumbased MOF identified the diffusivity coefficient and activation energy for diffusion24). The present study prepared MOFs with pore sizes smaller than 1 nm for use as materials for chromatographic separation. The separation mechanism was investigated in detail.

Kinetic Separation of Alkylbenzenes with Metal-organic Framework Compounds