We refer to this material as Co-4,6-dhip in the rest of this paper. ![]() A structural conformer of CPO-27, M 2( m-dobdc) where M is Co can be obtained by using the linker 4,6-dihydroxyisophthalic acid (4,6-dhip, an isomer of 2,5-dhtp) 10. These channels contain open metal sites upon removal of covalently bound water molecules, as such CPO-27 is an attractive option for the storage of gases, particularly Lewis acids such as CO and NO. It crystallises in the R-3 space group and consists of hexagonal channels running along the crystallographic c-axis. MOFs are well known for their high porosities and exceptional gas adsorption properties, due to their tuneable node chemistry and exceptionally high specific surface areas 3, 4.ĬPO-27 5, also referred to as MOF-74 6, is a well-studied and widely used MOF comprising M 2+ metal ions, where M can be a wide range of metals such as Mg, Co, Ni, Cu and Zn, linked by 2,5-dihydroxyterephthalate (2,5-dhtp) linkers 7, 8, 9. Their structures consist of metal nodes or oxoclusters bound by organic linkers to create large open lattice frameworks 2. Metal-organic frameworks (MOFs) are an extensively researched and exciting group of materials, with a wide range of applications including the storage and release of biologically active gases 1.
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