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Two novel 3D functional CPs based on the flexible 4-(4-carboxylphenylmethylthio)benzoic acid ligand have been successively synthesized. Complex 2 that is composed of Co(II), 4,4′-H 2 cpmb and 1,3-Hbib ligand displays good photo-degradation and adsorption properties for the organic dyes. Two new coordination polymers (CPs) based on transition metals, namely [Ni 2 (4,4′-cpmb) 2 (4,4′-bbibp) 2 (H 2 O) 4 ] n (1) and [Co(4,4′-Hcpmb)(1,3-bib)] n (2) (flexible 4,4′-H 2 cpmb = 4-(4-carboxylphenylmethylthio)benzoic acid, rigid 4,4′-bbibp = 4,4′-bis(benzoimidazo-1-ly)biphenyl and 1,3-Hbib = 1,3-bis(1-imidazo-1-ly)benzoic acid), have been designed and successfully synthesized under solvothermal conditions, which have been characterized by elemental analysis, infrared spectra, thermogravimetric (TG) analysis, powder X-ray diffraction (PXRD) and single-crystal X-ray diffraction. Single-crystal X-ray diffraction analysis reveals that 1 features a 3D supermolecular structure in ABAB mode by H bonds (O⋯H⋯O) with a 2-fold interpenetrating sql topology framework and 2 displays a 3D supermolecular framework by H bonds (O⋯H⋯O) with a rarely fes topology. Moreover, the photo-degradation and dye adsorption properties of CPs 1 – 2 have been investigated. Importantly, 2 shows good photo-degradation and dye adsorption properties. [ABSTRACT FROM AUTHOR]

Graphical abstract Two 3D functional coordination polymers based on the rigid 1,3,5-tris(1-imidazolyl)benzene ligand and cobalt transition metal have been successively synthesized. Complex 2 shows good photo-catalysis properties for the photo-catalytic degradation of mixed organic dyes (MB/MV/RhB). Abstract Two novel coordination polymers (CPs) based on cobalt transition metal, namely {[Co(tib) 2 ]·2HNO 3 } n (1) and {[Co(tib)(4,4′-sbdc)]·H 2 O} n (2) (tib = 1,3,5-tris(1-imidazolyl)benzene, H 2 sbdc = 4,4′-stilbenedicarboxylic), have been designed and successfully synthesized under solvothermal conditions, which were characterized by elemental analysis, infrared spectra, powder X-ray diffraction (PXRD), thermogravimetric (TG) analysis and single-crystal X-ray diffraction. Single-crystal X-ray diffraction analysis reveals that complex 1 features a stable 2D → 3D supramolecular frameworks through H-bonds with a rare (3,6)-connected kgd topology and complex 2 displays a 2-fold interpenetrating (2,4)-connected new topology with the point Schläfli of (44·62)(42). Importantly, the photo-catalytic properties of complexes 1 – 2 have been investigated, and then complex 2 is a good photo-catalyst for the degradation of mixed organic dyes (MB/MV/RhB). [ABSTRACT FROM AUTHOR]

In this study, we have synthesized six new coordination polymers (CPs), namely {[Cu 6 (3,5-bip) 6 (H 2 O) 12 (SO 4) 6 ]·3H 2 O} n (1), [Co(3,5-bip) (H 2 O) 3 (SO 4)] n (2), {[Cu(1,3-bit) 2 (H 2 O) 2 ]·2(NO 3)} n (3), {[Cu 2 (1,3-bit) 2 (1,3-bcbb) 2 ]·4(H 2 O)} n (4), [Cu(4,4′-bibp) (H 2 O) (NO 3) 2 ] n (5), [Cu(4,4′-bibp) (4,4′-Hsbdc)] n (6) via solvothermal methods. The structures of these new CPs have been characterized by elemental analysis, FTIR, TG analysis, PXRD and single crystal X-ray diffraction techniques. Meanwhile, the title CPs are explored for adsorption of organic dyes, i.e., anionic dyes (congo red (CR), and methyl orange (MO)) and cationic dye (methylene blue (MB)) considered extensively as water colorants pollutants. Worth noting, complex 3 can adsorb anionic dyes (CR and MO) quickly; complex 6 shows great performance in CR adsorption. Kinetic study reveals that the adsorption process is performed via pseudo-second-order reaction. The dye removal investigations of complexes 3 and 6 support that ions exchange and H-bonding interactions between CPs and target organic dyes are significant factors, heavily affecting dye adsorption. They have excellent potential in wastewater treatment. The first author and corresponding authors made the greatest contribution to this article, while the other authors contributed similarly. Image 1 • Six new coordination polymers (CPs) have been hydrothermally prepared and characterized. • Complexes 3 could selectively adsorbs anionic dyes (CR and MO) quickly from aqueous solution with good repeat-ability. • Complex 6 shows great dye adsorption performance for CR with good repeat-ability in aqueous system. • This work highlights the advantages of 2D CPs as excellent hazardous dye adsorbents. [ABSTRACT FROM AUTHOR]