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A new 3D luminescent Ba-organic framework {[Ba3L2(NMP)2(H2O)2]·2NMP·H2O}n (1) was first synthesized based on Ba(II) and a triangular-shaped bridging rigid ligand, namely 1,3,5-tris(4-carboxyphenly)benzene (H3L), via solvothermal reaction (NMP = N-methyl pyrrolidone), thereby forming a stabilized network including a one-dimensional (1D) infinite rod-like helical metal chain. 1 may be explored as a recyclable heterogeneous catalyst for the efficient fixation of CO2 to form serviceable cyclic carbonate since 1D channels remain decorated with abundant open metal sites (OMSs), and the catalytic efficiency of 1 was up to 98% for 1-bromo-2,3-propylene oxide. Simultaneously, the luminescence sensing shows that 1 has excellent response and sensitivity towards pollutants such as Fe3+, Cr2O72−, CrO42−, and [Fe(CN)6]3− ions. Moreover, 1 exhibits the particularly selective sorption towards the Congo red (CR) dye. Consequently, this study may provide a facile synthetic route for the construction of multi-functional Ba-MOF materials. [ABSTRACT FROM AUTHOR]

Abstract Four new water-stable luminescent metal-organic frameworks (MOFs), namely {[Zn 4 (L) 2 (H 2 O) 4 (OH) 2 ]·3NMP} n (1), {[Zn 3 (L) 2 (H 2 O) 2 ]·Diox} n (2), {[Cd 3 (L) 2 (H 2 O) 5 ]·NMP·3H 2 O} n (3), and {[Pb 3 (L) 2 (NMP) 2 (H 2 O)]·H 2 O} n (4), (H 3 L = 5-(1-(carboxymethyl)pyrazol-3-yl)isophthalic acid; NMP = N-methyl-2-Pyrrolidoneand; Diox = 1,4-Dioxane) have been solvothermally synthesized with different solvents. The single crystal structures of 1 – 4 reveal that complexes 1 and 2 form the 2D (3,6)-connected kgd nets based on the tetranuclear [Zn 4 (μ 1 -COO) 2 (μ 2 -COO) 4 ] clusters and trinuclear [Zn 3 (μ 1 -COO) 2 (μ 2 -COO) 4 ] clusters, respectively. Complex 3 displays a 2D (3,6)-connected kgd net based on the trinuclear [Cd 3 (μ 1 -COO) 4 (μ 2 -COO) 2 ] clusters. Complex 4 presents a 2D layer with a rod-shaped SBUs. The solid-state luminescence properties and water stability of these complexes were investigated carefully, showing that 1 displays high selectivity for Fe3+, CrO 4 2−, and Cr 2 O 7 2− via luminescence quenching effects with low detection limits. The probable quenching mechanisms have been studied in detail. Graphical abstract Four new water-stable luminescent metal-organic frameworks (MOFs) have been solvothermally synthesized via 5-(1-(carboxymethyl)pyrazol-3-yl)isophthalic acid ligand in different solvents. The single crystal structures of 1 - 4 reveal that complexes 1 and 2 form the 2D (3,6)-connected kgd nets based on the tetranuclear [Zn 4 (μ 1 -COO) 2 (μ 2 -COO) 4 ] clusters and trinuclear [Zn 3 (μ 1 -COO) 2 (μ 2 -COO) 4 ] clusters, respectively. Complex 3 displays a 2D (3,6)-connected kgd net based on the trinuclear [Cd 3 (μ 1 -COO) 4 (μ 2 -COO) 2 ] clusters. Complex 4 presents a 2D layer with a rod-shaped SBUs. The solid-state luminescence properties and water stability of these complexes were investigated carefully, showing that 1 displays high selectivity for Fe3+, CrO 4 2−, and Cr 2 O 7 2− via luminescence quenching effects with low detection limits. The probable quenching mechanisms have been studied in detail. fx1 Highlights • Four new Zn/Cd/Pb luminescent metal-organic frameworks have been synthesized and structurally characterized. • The water-stable of complexes 1-4 have been researched. • Compound 1 shows highly selective and sensitive response to Fe3+, CrO 4 2- and Cr 2 O 7 2-. [ABSTRACT FROM AUTHOR]

Seven new luminescent metal–organic frameworks (LMOFs), [Cd1.5(L)2(H2O)(NO3)]n (1), [Cd(L)2(H2O)2]n (2), [Pb(L)(H2O)2(NO3)]n (3), [Pb(L)2(H2O)]n (4), [Zn(L)2(H2O)4]n (5), [Zn2(L)(btc)(H2O)2]n (6) and {[Zn(L)(p-bdc)0.5(H2O)](p-H2bdc)0.5}n (7), were assembled employing 5-(triazol-1-yl)nicotinic acid (HL) with Cd(ii), Pb(ii) and Zn(ii) ions, revealing versatile frameworks as well as various types of coordination modes of HL. Single-crystal X-ray diffraction analyses reveal the different dimensionalities (0D, 1D, 2D or 3D) of complexes 1–7. Complex 1 displays a 3D dense-packing structure with a 3-nodal 3,4,6-connected net with a symbol of {4·64·8}2{4·2·64·89}{62·8}2. Complex 2 presents a 2D layered structure with a uninodal 4-connected sql net with a symbol of (44·62). Complex 3 shows a 1D chain based on [Pb2(COO)2(H2O)4(NO3)2N2] secondary building units (SBUs) and 4 exhibits a 1D dimeric chain. Complex 5 is a 0D structure. Complexes 6 and 7 display 2D layered structures based on binuclear [Zn2(COO)4(H2O)2N2] SBUs, which are designated as a 4-nodal 3,3,3,6-connected net with a symbol of {4·62}2{42·610·83}{63}4 and a 4-connected sql net, respectively. Further, the solid-state luminescence properties of the complexes were measured at room temperature. Meanwhile, 2 shows high selectivity and sensitivity for CrO42−, Cr2O72− and MnO4− ions by luminescence quenching effect with low detection limits, and the mechanisms of the quenching effect are discussed in detail. [ABSTRACT FROM AUTHOR]

Herein, three new luminescent metal–organic frameworks (MOFs), namely {[Cd4(H3L)4(H2O)12]·2.5H2O}n (1), {[Cd(L)]·2.5H2O·3[H2N(Me)2]}n (2), and {[Cd2(L)(DMA)]·[H2N(Me)2]}n (3), were designed and successfully prepared via a solvothermal reaction using V-shaped rigid multicarboxylate 2,4-di(3′,5′-dicarboxylphenyl)benzoic acid (H5L) and Cd(II) salts in various solvent systems. The structural analyses indicated that the H3L2−/L5− ligands took three different coordination fashions in 1–3; this resulted in a diversity of targeted MOFs. The solid-state luminescence properties of three MOFs were studied under ultraviolet light irradiation at ambient temperature, and 3 showed a high selectivity and sensitivity for nitrobenzene and Fe3+ because of the quenching effect. Thus, it could be a potential crystalline material for detecting these substances. The mechanisms of the quenching effect and sensing properties of 3 have been discussed in detail. [ABSTRACT FROM AUTHOR]

In this report, seven new luminescent metal–organic frameworks (LMOFs), [Zn(L)0.5(H2O)2]·H2O (1), [Zn(L)0.5(DMF)] (2), [Zn3(L)(μ3-OH)2(H2O)4] (3), [Zn2(L)(DMA)(H2O)]·5(H2O) (4), [Cd(L)]·2(H3O)·(H2O) (5), [Cd2(L)(H2O)3] (6), and [Pb(L)0.5(H2O)] (7) (H4L = [1,1′:4′,1′′-terphenyl]-2′,3,3′′,5′-tetracarboxylic acid; DMF = N,N-dimethylformamide; DMA = N,N-dimethylacetamide) have been solvothermally synthesized by using Zn(ii), Cd(ii), Pb(ii) ions and H4L in different solvent systems, all of which have been routinely characterized by elemental analysis, FT-IR spectroscopy, powder X-ray diffraction (PXRD), and thermogravimetric analysis (TGA). Single-crystal X-ray diffraction analyses show the different dimensionalities (1D, 2D or 3D) of complexes 1–7. Comparative structural studies of 1–7 reveal that the L4− ligands adopt different coordination morphologies: 1 (η1μ1χ1), 2 (η2μ2χ2), 3 (η2μ2χ2), 4 (η2μ2χ2; η1μ1χ1), 5 (η2μ1χ2), 6 (η2μ2χ2; η2μ2χ3), and 7 (η2μ2χ2; η2μ3χ4) with Zn(ii) (74 pm), Cd(ii) (97 pm) and Pb(ii) (119 pm) in different solvent systems, which produce the complexes with different frameworks. Complex 1 displays a 1D dimeric chain. Complexes 2 and 5 present a 2D layer structure with a uninodal 4-connected sql net with a symbol of (44·62). Complexes 3, 6 and 7 have a 3D dense packing structure based on infinite 1D rod-like secondary building units (SBUs). Complex 3 is designated as a binodal (4, 6)-connected fry topological net with the point symbol (510·63·78)(54·62). The whole network of 6 can be simplified as a binodal (4, 8)-connected flu topological net with a point symbol of (412·612·84)(46)2. Complex 7 can be seen as a new binodal (5, 10)-connected topological net with the point symbol (410)2(428·616·8). Complex 4 shows a 3D framework based on a binuclear [Zn2(CO)3O3] SBU, which can be viewed as a uninodal 4-connected sra topological net with the point symbol (42·63·8). Further, the solid-state luminescence properties of the complexes were measured and studied intensively at room temperature. [ABSTRACT FROM AUTHOR]

By treating a semirigid 5-oxyacetate isophthalic acid (H3OAIP) ligand with MnSO4/CoSO4/CdSO4 under solvothermal conditions, three isostructural cluster organic frameworks, [M2(OH)(OAIP)(DMA)] ⋅H2O (M=Mn2+ ( 1), Co2+ ( 2), Cd2+ ( 3); DMA= N,N′-dimethylacetamide) were constructed. The three complexes contain novel eight-connected tetranuclear M4(OH)2(COO)6(OCH2COO)2 clusters with the unique hexagonal bipyramidal configuration, which are extended by four-connected OAIP linkers to form an uncommon (4,8)-connected alb-4,8-Cmce topology based on (3,6)-connected kgd sublayers. Both 1 and 2 showed significant antiferromagnetic interactions between the intracluster metal ions, whereas 3 revealed strong blue photoluminescence. [ABSTRACT FROM AUTHOR]

Seven new complexes based on the bifunctional ligand were synthesized under hydro(solvo)thermal conditions. 1 – 7 adopts different coordination modes and generates diverse 1D or 2D structures. • The L2−/HL− ligand in 1 – 7 adopts different coordination modes and generates diverse structures. • Compound 1 shows highly selective and sensitive response to Fe3+. • Compound 1 shows highly selective sensitivity for Cr2O 7 2− and MnO 4 2−. Seven new complexes based on 4-(3-carboxyl-1,2,4-1H-triazol-1-yl)benzoic acid (H 2 L), namely [Zn(L)(H 2 O) 2 ] n (1), [Cd(L)(H 2 O) 2 ] n (2), [Pb(HL) 2 ] n (3), [Pb(L)(H 2 O)] n (4), [Cu(L)(H 2 O) 2 ] n (5), [Co(L)(H 2 O) 2 ] n (6) and [Mn(L)(H 2 O) 2 ] n (7), were synthesized by employing different center metal ions and a imidazol-carboxyl bifunctional ligand (H 2 L) under hydro(solvo)thermal conditions. The L2−/HL− ligand in 1 – 7 adopts different coordination modes and generates diverse 1D or 2D structures. The luminescent and magnetic properties of seven complexes were investigated in detail. Moreover, complex 1 shows high selectivity for Fe3+, Cr 2 O 7 2− and MnO 4 − ions, indicating that 1 can be an excellent candidate for luminescence sensing. In addition, complexes 5 , 6 and 7 demonstrate antiferromagnetic interactions. [ABSTRACT FROM AUTHOR]