am8b02015_si_010.cif (5.4 MB)

Ligand-Based Phase Control in Porous Molecular Assemblies

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posted on 26.03.2018, 00:00 by Omar Barreda, Gianluca Bannwart, Glenn P. A. Yap, Eric D. Bloch
Functionalization of isophthalic acid ligands with linear alkoxide groups from ethoxy through pentoxy is shown to have a pronounced effect on both the synthesis of porous paddlewheel-based molecular assemblies and their resulting surface areas and gas adsorption properties. Shorter chain length is compatible with either tetragonal or hexagonal two-dimensional materials, with the hexagonal phase favored with longer chain length. Precise tuning of reaction conditions affords discrete molecular species that are soluble in a variety of organic solvents. The isolated porous molecules display BET surface areas ranging from 125 m2/g to 545 m2/g. The pentoxide-based molecular assembly shows considerable promise for the separation of hydrocarbons with average isosteric heats of adsorption of −48 and −31 kJ/mol for ethylene and ethane, respectively.

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