摘要
A crystalline,porous Metal-Organic Polyhedron(MOP)4 was readily assembled starting from 9H-carbazole-3,6-dicarboxylic acid,which was synthesised in only three steps.The single crystal X-ray diffraction analysis of the resulting supramolecule evidenced voids that were occupied by coordinated as well as uncoordinated solvent molecules from the solvothermal reaction.Careful analysis of its desolvation process,activating the sample at 150℃and 10-5 bar(followed by FTIR),evidenced that all solvents were completely removed,leaving an empty but nevertheless crystalline MOP with coordinatively-unsaturated Cu(II)sites that was studied for gas adsorption using N_(2)at 77 K,and CO_(2)at 196 K.Notably,carbon dioxide was found to be strongly adsorbed in the activated 4(12.1 mmol g^(-1),53.2 wt%)with a molar enthalpy of adsorption ofΔH=65.12 kJ mol-1,revealing a great selectivity over nitrogen,which in turn showed negligible uptake under the same activation conditions.In situ Raman experiments demonstrated the direct interaction of CO_(2)molecules and coordinatively-unsaturated Cu(II)sites within 4.
基金
support.I.A.I.thanks CONACyT Mexico(212318)
PAPIIT UNAM Mexico(IN100415 and IN101517)for financial support.
