A [Cu2(bdc)2(dabco)] coated GC capillary column for the separation of light hydrocarbons and the determination thermodynamic and kinetic data thereof

The unique properties of MOFs (MOF = metal-organic framework) such as their adjustable pore size, high intrinsic surface area and organic functionalizations make them a suitable class of materials for chromatographic separations. Micro particles of [Cu-2(bdc)(2)(dabco)] (bdc(2-) = terephthalate, DABCO = 1,4-diazabicyclo[2.2.2]octane) were prepared by a cyclic deposition method based on the technique of the so called "controlled SBU approach" and anchored via SAMs (SAM = self-assembled monolayer) in a short GC capillary column to generate a wall-bonded cross linked stationary phase. It could be demonstrated, that the fabricated column exhibits a high separation power for the light hydrocarbons C-1-C-7. Chromatographic parameters, including resolution factors and selectivity as well as thermodynamic data characterizing the interaction between the stationary phase and the analytes, were determined from the temperature-dependent measurements of the retentions times of these analytes. In addition, isothermal measurements were used for the calculation of diffusion constants in [Cu-2(bdc)(2)(dabco)]. (C) 2013 Elsevier Inc. All rights reserved.