Selectivity differences of coordination compound stationary phases for polyaromatic hydrocarbons and polar analytes in gas and liquid phases

摘要: A precursor solution to the metal-organic framework (MOF), Cd(1,4,7,10-tetrakis(4-carboxybenzyl)-1,4,7,10-tetraazacyclododecane), was aged in a surface-functionalised 250μm-diameter capillary, generate film containing constituents of bulk phase crystalline material. EDX analysis revealed higher ratio ligand elements (C, N and O) Cd capillary coated compared that achieved from synthesis vial. Separation performance for gas chromatography (GC) original MOF crystals packed tips liquid elution (LEC) towards separation polycyclic aromatic hydrocarbons (PAHs) small probe analytes with different properties. This study showed retention mechanisms were observed same set phases. Independently trend vapour pressure difference, GC result less specific size selective retention, but stronger larger PAHs. linear solvation energy relationship correlation further enhanced contributions (positive stationary descriptor values) by cavity formation/dispersion interactions H-bonding acid functionality both LEC (though LEC), whilst basic functional groups slightly increased GC; strengthened dipole-dipole/dipole-induced dipole only LEC.