Abstract
New mononuclear and hetero-binuclear MOFs derived from the reaction of 1,4-bis[(3,5-dimethyl)pyrazole-4-yl]benzene (H2DPB) with zinc nitrate or mixture of zinc and cobalt nitrates have been synthesized solvothermally from DMF or ethanol. The crystal structure of Zn(DPB) (1) indicates that it crystallizes in cubic system, with cell parameters, a = b = c = 6.7536 A and α = β = γ = 90°. Tetrahedral structure around 1D Zn atoms run parallel to b axis is observed. Zn(DPB) (2) isolated from DMF crystallizes in monoclinic system, with cell parameters, a = 14.8865, b = 9.8392 and c = 10.8285 A and α = γ = 90o and β = 93.05°. The results showed that Zn(DPB) (1) and CoZn(DPB) (3) MOFs isolated from ethanol are thermally and mechanically more stable than Zn(DPB) (2) and CoZn(DPB) (4). Pore texture shows that the highest BET surface area belongs to CoZn (DPB) (3). The compound Zn(DPB) (1) does not lose its crystallinity even after applying 0.2 GPa stress. Adsorption of nitrogen indicated the presence of type I isotherm characteristic to permanent microporosity. Compounds (1) and (3) do not lose their porosity under mechanical stress.
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