Two Mn3 cluster-based frameworks with porosity tuned by solvent coordinationon-coordination: Structural correlation and sorption properties

摘要

Two new porous metal-organic frameworks based on the versatile terephthalate ligands and well-known Mn3 SBUs, namely [Mn_(13)(tpa)_(1.5)(MeOH)2](MeOH) (1) and [Mn_(1.5)(tpa)(Htpa)]-(Solvent)_x (2), have been prepared through altering solvent system. Single-crystal X-ray analysis reveals that their porosity is mainly dependent on the coordination ability of solvent molecules. Their structures are closely correlated with that of other two reported, compounds ([Mn_(1.5)(tpa)_(1.5)(DMA)2]-(3) and [Mn_(1.5)(aqH)(Hatpa)]-(4), DMA = N,N'-dimethylacetamide and H2atpa = 2-aminoterephthalic acid). Topological analysis is used to improve our understanding for the general feasibility to tune their porosity. The distinct porosity of two compounds has also been characterized by N2 adsorptions. Compound 2 has a type I adsorption isotherm with an appreciable adsorption of 74.72 cm~3g~(-1) at 0.35 P/P_o, whereas 1 exhibits a maximum uptake of 19.84 cm~3g~(-1) at approximately 1 atm.