Abstract
Solvothermal reaction of Zn(NO3)2, 4-(1H-pyrazol-4-yl)pyridine (Hpypz) and 1,3,5-benzenetricarboxylic acid (H3btc) in N,N-dimethylacetamide (DMA) produced a new porous coordination polymer [Zn5(pypz)4(btc)2] (1). Single-crystal X-ray diffraction study of 1 showed that deprotonated pypz– ligands served as 1,2,4-triazolate-like ligands, linking Zn(II) ions to form porous two-dimensional (2-D) sql-a layers {Zn(pypz)}+, which were further connected by eight-legged pillars {Zn2(btc)4(H2O)2}8– based on the typical paddlewheel dinuclear Zn2(RCOO)4(H2O)2 cluster to form a novel type of non-interpenetrated pillared-layer framework with 3-D intersecting pore system and large pore volume. Gas sorption measurements revealed that 1 possesses large BET surface area of 2061 m2 g–1 and very high methane total uptake of 245 cm3(STP) cm–3 at 298 K and 65 bar.
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