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Color tunable entangled coordination polymers based on long flexible bis(imidazole) ligands and phenylenediacetate

Abstract

Six coordination polymers, [Co2(mpda)2(Hmpda)(bibp)]•H2O (1), [Pb(Hmpda)(bibp)Cl]•H2O (2), [Cd(mpda)(bibp)] (3), [Cd(ppda)(bibp)] (4), [Cd(opda)(bib)0.5(bipy)]•2H2O (5), [Zn(opda)(bib)] (6), where (H2pda = phenylenediacetic acid, bibp = 4,4'-bis(imidazol-1-ylmethyl)biphenyl, bib = 1,4-bis(imidazol-1-ylmethyl)benzene, bipy = 2,2'-bipyridine), have been synthesized by using different metal salts with phenylenediacetic acid and bis(imidazole) ligands under hydrothermal conditions. Their structures have been characterized by elemental analysis, IR spectroscopy, single-crystal X-ray crystallography and powder X-ray diffraction (PXRD) analysis. Due to the coordination geometry around the metal ions and the diverse coordination modes of the flexible ligands, the obtained complexes 1–6 show different types of entangled character. Complex 1 possesses an extended 2D polyrotaxane and polycatenane network based on 1D ringed ribbon-like chain. The 2D coordination layers of 2 and 4 are entangled to produce 2D→3D polythreading architecture. Both of 3 and 6 is composed of three-fold interpenetrating 3D diamond frameworks containing single chiral helix chain. While three 2D helical layers of 5 are interpenetrated each other with the alternant arrange of three-stranded right- and left-handed helix. Furthermore, the fluorescence emission color of these complexes (2–6) can be tuned from dark blue to light blue and green.

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Publication details

The article was received on 23 Feb 2017, accepted on 12 Sep 2017 and first published on 12 Sep 2017


Article type: Paper
DOI: 10.1039/C7NJ00645D
Citation: New J. Chem., 2017, Accepted Manuscript
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    Color tunable entangled coordination polymers based on long flexible bis(imidazole) ligands and phenylenediacetate

    M. Zhang, J. Wang, Z. Ma and L. Qiao, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ00645D

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