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

The assembly of Cu(CH<sub>3</sub>COO)<sub>2</sub>·H<sub>2</sub>O and pyridine-4,5-imidazoledicarboxylic acid (H<sub>3</sub>PyImDC) under solvothermal conditions in the presence of different organic templates yielded two three-dimensional chiral frameworks, |(C<sub>3</sub>H<sub>10</sub>N<sub>2</sub>)(C<sub>3</sub>H<sub>7</sub>NO)<sub>0.5</sub>(H<sub>2</sub>O)<sub>2</sub>|[Cu<sup>II</sup>C<sub>10</sub>H<sub>5</sub>O<sub>4</sub>N<sub>3</sub>] (<b>1</b>) and |(C<sub>4</sub>H<sub>9</sub>NO)<sub>0.5</sub>(H<sub>2</sub>O)<sub>8</sub>|[Cu<sup>II</sup><sub>2</sub>Cu<sup>I</sup>(C<sub>10</sub>H<sub>5</sub>O<sub>4</sub>N<sub>3</sub>)<sub>2</sub>(C<sub>10</sub>H<sub>6</sub>O<sub>4</sub>N<sub>3</sub>)] (<b>2</b>). Both of the compounds crystallized in the cubic, <i>P</i>4<sub>3</sub>32 space group and possessed open helical channels in the frameworks. To the best of our knowledge, compounds <b>1</b> and <b>2</b> present the first synthesized MOFs with a <b>bmn</b> and <b>lcy-a</b> 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.