(630m) Impact of Alkyl-Functionalized BTC On Properties of Copper-Based Metal-Organic Frameworks

Porous structures in which pore size and functionality could be varied systematically have been designed by changing the functional groups of ligands. Highly porous metal coordination polymers [Cu₃(MBTC)₂(H₂O)₃]_n (where MBTC is methyl-1,3,5-benzenetricarboxylate) and [Cu₃(EBTC)₂(H₂O)₃]_n (where EBTC is ethyl-1,3,5-benzenetricarboxylate) have been solvothermally synthesized in mixed solvents of water and ethanol. They both have two different [Cu₂(O₂CR)₄] units (where R is an aromatic ring), which create the same three-dimensional framework with open metal sites and high surface area. The pore size and adsorption properties are altered by introduction of the organic groups -CH₃ or -C₂H₅. Both of them exhibit relative low adsorption of water due to the hydrophobic functional groups. CuMBTC showed high adsorption of CO₂ and CH₄ at low pressure.