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Two structurally similar columnar ZnII-MOFs {[Zn8L4(TZ)4·0.5H2O]·4[Me2NH2]·6DMF·4H2O}n (Zn-MOF1) and {[Zn4L2(MT)2·H2O]·2[Me2NH2]·4DMF·4H2O}n (Zn-MOF2) were synthesized with irregular ligands, 2,2′-(pyridine-2,6-diyl) diterephthalic acid (H4L), 1,2,4-triazolium (TZ) and 1H-1,2,4-triazole-3-thiol (MT). Structural studies showed that both ZnII-MOFs had a similar 3D framework constructed with multiple SBUs and displayed an unusual (3,4,6)-connection topology. Furthermore, both ZnII-MOFs have high performance in gas adsorption and separation. The separation ratios of C2H2/CH4 and CO2/CH4 of Zn-MOF1 were 15.1 and 6.8, respectively, and those of Zn-MOF2 were 14.6 and 6.5, respectively. Moreover, Eu@Zn-MOF1 and Eu@Zn-MOF2 were successfully obtained by adding Eu3+ ions to the synthesis system. After a series of fluorescence tests, these two MOFs were found to have good fluorescence performance, and showed high selectivity and sensitivity to Fe3+ ions in aqueous solution with a low detection limit. [ABSTRACT FROM AUTHOR]

An anionic three-dimensional framework {(Me2NH2)2[Zn8(L)6(ad)4(μ4-O)]·10DMF·11H2O}(Zn-MOF, L2− = 4,4′-(3-aminopyridine-2,5-diyl)dibenzoic acid; ad− = adeninate) with a column-layered structure was synthesized. Structural studies show that the Zn-MOF has octahedral cages [Zn8(ad)4(μ4-O)], the adjacent cages are connected by O atoms to form 1D columnar SBUs, and every four SBUs are connected by L2− to form a square channel 3D framework. Gas adsorption studies show that the BET and Langmuir surface areas of Zn-MOF are 1370.31 and 1478.04 m2 g−1, respectively, and the total pore volume for single-point adsorption is 0.528 cm3 g−1. The surface of the pores of the Zn-MOF is occupied by open metal sites and uncoordinated carboxyl groups, showing good capture ability for C2H2 and good adsorption selectivity for C2H2/CH4. More importantly, the free (CH3)2NH2+ ions present in the pores of the columnar layered Zn-MOF can cation-exchange with MB, MV, and RhB ions in aqueous solution. Therefore, Zn-MOF can not only effectively adsorb the cationic dyes MB, MV, and RhB, but also exhibit particularly selective sorption towards the mixed anion and cation dyes MB/MO and MV/MO. In addition, a series of fluorescence experiments show that Zn-MOF has good fluorescence properties, exhibiting highly selective and sensitive fluorescence detection and recognition performance for Fe3+ ions in aqueous solution with a low detection limit. [ABSTRACT FROM AUTHOR]

Two new complexes, namely, [Tb 0.5 L(HCOO) 0.5 n (1) , {[Tb 2 (L) 4 (H 2 O)]·2NO 3 } n (2) were solvothermally constructed based on N-heterocyclic dicarboxylate ligand (H 2 L, 4-(1-(4-carboxylatobenzyl)pyridinium-4-yl)benzoic). Complex 1 is a 3D porous framework. 2 is a 3D supramolecular architecture constructed from 1D chains linked by hydrogen bondings. In addition, the results of solid state fluorescence studies show that complexes 1 and 2 exhibit excellent fluorescence properties. Dramatically, the gas sorption behaviour investigation manifests that the desolvated 1a displays higher uptake capacities for CO 2 and C 2 H 2 and high selectivity for C 2 H 2 and CO 2 over CH 4. Two new complexes, namely, [Tb 0.5 L(HCOO) 0.5 n (1) , {[Tb 2 (L) 4 (H 2 O)]·2NO 3 } n (2) were solvothermally synthesized based on a N-heterocyclic dicarboxylate ligand (H 2 L, 4-(1-(4-carboxylatobenzyl)pyridinium-4-yl)benzoic). In addition, the results of solid state fluorescence studies show that complexes 1 and 2 exhibit excellent fluorescence properties. Dramatically, the gas sorption behaviour investigation manifests that the desolvated 1a displays higher uptake capacities for CO 2 and C 2 H 2 and high selectivity for C 2 H 2 and CO 2 over CH 4. Image 1 • Two new complexes were constructed based on N-heterocyclic dicarboxylate ligand. • Complex 1 features a 3D porous framework. • The desolvated 1 a displays highly selective capture properties of C 2 H 2 and CO 2. [ABSTRACT FROM AUTHOR]

Two structurally similar columnar ZnII-MOFs {[Zn8L4(TZ)4·0.5H2O]·4[Me2NH2]·6DMF·4H2O}n (Zn-MOF1) and {[Zn4L2(MT)2·H2O]·2[Me2NH2]·4DMF·4H2O}n (Zn-MOF2) were synthesized with irregular ligands, 2,2′-(pyridine-2,6-diyl) diterephthalic acid (H4L), 1,2,4-triazolium (TZ) and 1H-1,2,4-triazole-3-thiol (MT). Structural studies showed that both ZnII-MOFs had a similar 3D framework constructed with multiple SBUs and displayed an unusual (3,4,6)-connection topology. Furthermore, both ZnII-MOFs have high performance in gas adsorption and separation. The separation ratios of C2H2/CH4 and CO2/CH4 of Zn-MOF1 were 15.1 and 6.8, respectively, and those of Zn-MOF2 were 14.6 and 6.5, respectively. Moreover, Eu@Zn-MOF1 and Eu@Zn-MOF2 were successfully obtained by adding Eu3+ ions to the synthesis system. After a series of fluorescence tests, these two MOFs were found to have good fluorescence performance, and showed high selectivity and sensitivity to Fe3+ ions in aqueous solution with a low detection limit. [ABSTRACT FROM AUTHOR]

• Two new metal organic frameworks were synthesized. • MOF 1 displays a 2D topological network with the point symbol of {43} 2 {46·66·83}. • MOF 2 shows a three-dimensional structure with a topological symbol of {4·6·8} 2 {42·62·84·102}{62·8}. • MOF 1 and MOF 2 exhibit good gas adsorption properties, and MOF 2 is highly selective to C 2 H 2 /CH 4. • In addition, both MOF 1 and MOF 2 can selectively and sensitively detect Fe3+ in water. Two new metal organic frameworks (MOFs) were synthesized by solvent-thermal synthesis with fluorinated 4,4′-(pyridine-3, 5-diyl) bis (3-fluorobenzoic acid) ligands (L1), namely {[Cd(L1)H 2 O]·DMF} n (MOF 1) and {[Zn(L1)]·3H 2 O} n (MOF 2). Single crystal X-ray diffraction analysis shows that MOF 1 is a two-dimensional structure with binuclear unit of [Cd 2 (COO) 4 N 2 O 2 ]. MOF 2 displays a three-dimensional structure based on binuclear unit of Zn 2 (COO) 2. The PXRD determination demonstrates the purity of the synthesized MOF 1 and MOF 2 samples, while the TGA shows the thermal stability of the structures. The gas adsorption studies show that MOF 1 and MOF 2 exhibit good gas adsorption characteristics, and MOF 2 has high selectivity for C 2 H 2 /CH 4. Moreover, both MOF 1 and MOF 2 can selectively and sensitively detect Fe3+ in water. Two new metal organic frameworks show different structures. MOF 1 possess the [Cd 2 (COO) 4 N 2 O 2 ] SBUs and displays a 2D topological network with the point symbol of {43} 2 {46·66·83}. MOF 2 shows a three-dimensional structure with a topological symbol of {4·6·8} 2 {42·62·84·102}{62·8}. Both MOF 1 and MOF 2 exhibit good gas adsorption properties. In addition, MOF 1 and MOF 2 can selectively and sensitively detect Fe3+ in water. [Display omitted] [ABSTRACT FROM AUTHOR]

Nine new lanthanide coordination polymers, namely, [La 2 (MPIP) 2 (1,3-bdc) 3 ] n ‧5 n H 2 O (1) [Nd 2 (MPIP) 2 (1,3-bdc) 3 ] n ‧7 n H 2 O (2) , [Yb 2 (MPIP)(1,3-bdc) 3 ] n (3) , [Eu 2 (MPIP) 2 (1,3-bdc) 2 (CH 3 COO) 2 ] n (4) , [Ln 2 (MPIP) 2 (1,3-bdc) 2 (NO 3) 2 ] n ‧3 n H 2 O (Ln = Tb (5), Gd (6)), [Ln 2 (MPIP) 2 (1,3-bdc) 3 ] n ‧2 n H 2 O (Ln = Dy (7), Ho (8), Er (9)), MPIP = 2-(3-methylphenyl)imidazo(4,5-f)(1,10)-phenanthroline, H 2 (1,3-bdc) = benzene-1,3-dicarboxylic acid) have been synthesized under hydrothermal or solvothermal conditions and characterized by IR spectra, elemental analyses, powder X-ray diffraction and single crystal X-ray diffraction. Compounds 1 – 9 features 1D or 2D lanthanide isophthalate structures bearing large conjugated imidazophenanthroline derivative ligands. The thermal stabilities and luminescence properties of compounds 1 – 9 were investigated. Based on fluorescence sensing behavior, compounds 4 and 5 display a highly sensitive response toward Fe3+ ion through significant fluorescence quenching. Meanwhile, compound 5 can be used as an indicator to detect acidic and alkali environments. The white light emission was studied by heterogeneous physical mixing components of compounds 1 , 4 and 5. Nine new lanthanide coordination polymers based on 2-(3-methylphenyl)imidazo-(4,5-f)(1,10)-phenanthroline and benzene-1,3-dicarboxylic acid have been successfully synthesized. Compounds 1 – 9 exhibit a 1D or 2D lanthanide isophthalate structures bearing large conjugated imidazophenanthroline derivative ligands. Compounds 4 and 5 can be potential crystalline materials for detecting Fe3+ ion. Meanwhile, compound 5 can be used as an indicator to detect acid and alkali environments. In addition, white-light emission was obtained by heterogeneous physical mixing components of compounds 1 , 4 and 5. Image 1 [ABSTRACT FROM AUTHOR]