Assembly of Two Metal−Organic Frameworks with Intrinsic Chiral Topology from Achiral Materials

The assembly of Cu(CH₃COO)₂·H₂O and pyridine-4,5-imidazoledicarboxylic acid (H₃PyImDC) under solvothermal conditions in the presence of different organic templates yielded two three-dimensional chiral frameworks, |(C₃H₁₀N₂)(C₃H₇NO)_0.5(H₂O)₂|[Cu^IIC₁₀H₅O₄N₃] (1) and |(C₄H₉NO)_0.5(H₂O)₈|[Cu^II₂Cu^I(C₁₀H₅O₄N₃)₂(C₁₀H₆O₄N₃)] (2). Both of the compounds crystallized in the cubic, P4₃32 space group and possessed open helical channels in the frameworks. To the best of our knowledge, compounds 1 and 2 present the first synthesized MOFs with a bmn and lcy-a net. Further characterization of the two compounds has been performed, including X-ray powder diffraction, inductively coupled plasma analysis, CHN, IR spectra, fluorescence spectra, X-ray photoelectron spectroscopy spectrum and thermogravimetric-differential thermal analysis.