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

Abstract

The assembly of Cu(CH 3 COO) 2 ·H 2 O and pyridine-4,5-imidazoledicarboxylic acid (H 3 PyImDC) under solvothermal conditions in the presence of different organic templates yielded two three-dimensional chiral frameworks, |(C 3 H 10 N 2 )(C 3 H 7 NO) 0.5 (H 2 O) 2 |[Cu II C 10 H 5 O 4 N 3 ] ( 1 ) and |(C 4 H 9 NO) 0.5 (H 2 O) 8 |[Cu II 2 Cu I (C 10 H 5 O 4 N 3 ) 2 (C 10 H 6 O 4 N 3 )] ( 2 ). Both of the compounds crystallized in the cubic, P 4 3 32 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.