Add time:08/23/2019         Source:sciencedirect.com

Self-assembly of transition metal salts with long bifunctional ligand affords three entangled coordination frameworks, namely, [Co(ppmba)2] (1), [Zn(ppmba)2]·0.5H2O (2) and [Cd(ppmba)2]·0.25H2O (3) (Hppmba = 4-((3-(pyridin-4-yl)-1H-pyrazol-1-yl)methyl)benzoic acid). Their structures were determined by single-crystal X-ray diffraction analyses and further characterized by element analyses, IR spectra, X-ray powder diffraction, and TG analyses. Compound 1 is a peculiar (2D → 3D) interdigitated architecture that is assembled from bilayer motifs. Compounds 2 and 3 exhibit fascinating (2D → 3D) entangled frameworks constructed from undulating 44-sql layers, which have both polycatenane and interdigitation characters. In addition, the magnetic properties of compound 1 and the photoluminescence properties of compounds 2 and 3 were studied.

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