Assembly of two novel Lindqvist polyoxoanion-templated coordination polymers with standard honeycomb cavities

Two novel polyoxometalate(POM)-templated coordination polymers: [Cu2(phnz)3][M6O19] (M = Mo for 1, W for 2; phnz = phenazine), have been hydrothermally synthesized and characterized by routine physical methods and single crystal X-ray diffraction. In the compounds, Lindqvist POMs as templates induce the [Cu2(phnz)3] complexes to 2D hexagonal metal-organic framework (MOF), which represents 63 topologies of dimensions ca. 13.515 × 13.515 × 13.515 Å. Furthermore, the 2D sheets are held together by Lindqvist POMs into 3D supramolecular networks with 1D channel, and Lindqvist POMs site in the channels. The successful syntheses and isolation of two compounds provide a novel example of the utility of POM clusters as templates for self-assembly extended framework with cavities.

Graphical abstractBased on Lindqvist POM and phenazine, a porous metal-organic framework with standard hexagon is formed, in which POM as guest molecules occupy all of the voids. Additionally, POMs play dual role, namely, POMs as template induce the formation of the honeycomb cavities in the same sheet; and as linkers connect the 2D sheet motifs into 3D structures in the different sheets.Figure optionsDownload full-size imageDownload as PowerPoint slide