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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]

Three novel Zn(II)-based coordination polymers (Zn-CPs), namely {[Zn(1,3,5-tib) 2 (H 2 O) 2 ·2(NO 3)} n (1), [Zn(1,3,5-tib)(4,4′-saba)] n (2), and {[Zn(1,3-bit)(4,4′-cpmb)]·0.5(1,3-bit)} n (3), have been hydrothermally synthesized and successfully characterized by single crystal X-ray diffraction (1,3,5-tib ​= ​1,3,5-tris(1-imidazolyl)benzene), 4,4′-Hsaba ​= ​4-(4-sulfoacid)-benzoic acid, 1,3-bit ​= ​1,3-bis(l-imidazoly)toluene, and 4,4′-H 2 cpmb ​= ​4-(4-carboxylphenylmethylthio)benzoic acid). Structural analysis reveals that complex 1 manifests a 2D planar structure with an unprecedented (2,4)-c topological network. Complex 2 and complex 3 display a 3-c fes and 6-fold classical Ia interpenetrated dia framework with 4-c (66) sqc6 topology framework, respectively. Among the three complexes, CPs 1 and 2 demonstrate excellent performance for Azo organic dyes' adsorption, for which the selectivity and kinetics have been comprehensively studied. CPs 3 shows great luminescent intensity in aqueous solution. It is further applied as a fluorescence sensor to detect Fe3+ cation, Cr 2 O 7 2− anion, and tetracycline antibiotic. Three Zn(II) coordination polymers (Zn-CPs), {[Zn(1,3,5-tib) 2 (H 2 O) 2 ·2(NO 3)} n (1), [Zn(1,3,5-tib)(4,4′-saba)] n (2), and {[Zn(1,3-bit)(4,4′-cpmb)]·0.5(1,3-bit)} n (3), have been hydrothermally prepared. While 1 – 2 could be applied as a CR dye adsorbent, and 3 could be as a potential sensing material for detection of Fe3+, Cr 2 O 7 2−, and TC. Image 1 • Three new Zn (II) coordination polymers (Zn-CPs) have been hydrothermally prepared and characterized. • Complexes 1 – 2 could selectively removal CR dye molecule from aqueous solution. • Complex 3 could be used to detect Fe3+, Cr 2 O 7 2−, and TC with high selectivity, anti-interference, and repeat-ability. [ABSTRACT FROM AUTHOR]