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Three novel Mn(II)/Co(II)-based 3D metal-organic frameworks (MOFs), namely {[Mn 2 (L)(tib)(H 2 O)]·3DMA·4H 2 O} n (1), {[Co 2 (L)(bipd) 2 ]·3H 2 O} n (2) and {[Co(L) 0.5 (bimb)]·3H 2 O·0.5O 2 } n (3) (H 4 L ​= ​5,5'-(1,4-xylylenediamino) diisophthalic acid, tib ​= ​1,3,5-tris(1-imidazolyl)benzene, bipd ​= ​3,5-bis(1-imidazoly)pyridine, and bimb ​= ​1,4-bis(lmidazol)-butane), have been successfully synthesized using the mixed-ligand as functionalized organic linker. The structural characterization revealed that both MOFs 1 and 2 exhibited an unprecedented 4-nodal 3D framework that enriching crystal engineering, while MOF 3 featured a 2-nodal three-interpenetrating bbf topology framework with a Schläfli symbol of (64·82)(66) 2. The title MOFs have been exploited as photocatalysts for degradation of methylene blue (MB), methyl violet (MV) and malachite green (MG). The photocatalytic results demonstrated that MOFs 2 and 3 exhibited efficient photocatalytic abilities to degrade the three aromatic dyes under UV irradiation. The possible catalytic mechanism was also explored and discussed in detail. Moreover, the variable-temperature magnetic analyses indicated that MOFs 1 – 3 exhibited weak antiferromagnetic behavior between Mn(II)/Co(II) ions. [Display omitted] • Three novel Mn(II)/Co(II)-based 3D MOFs under solvothermal or hydrothermal condition in one-step, for the first time, were synthesized. • The MOFs 2 and 3 act as efficient heterogeneous photocatalyst for degradation of three aromatic dyes. • The possible catalytic mechanism was explored and discussed in detail. • MOFs 1 – 3 exhibit antiferromagnetic coupling between neighboring central ions. [ABSTRACT FROM AUTHOR]

Four novel Co(II)-MOFs based on the 3,3′-azodibenzoic acid (H 2 L), namely [CoL (bimb) 0.5 ] n (1), {[CoL (bimmb)]·DMF} n (2), [CoL (bimmb) 0.5 ] n (3), and [CoL (bbibp)] n (4) (bimb = 1,4-bisimidazole, bimmb = 4-bis(imidazole-1-ylmethyl)benzene, bbibp = 4,4′-bis(benzoimidazo-1-yl)biphenyl and DMF = N, N′-dimethylformamide) have been synthesized under solvothermal conditions and characterized by elemental analysis, IR spectra, powder X-ray diffraction (PXRD), thermogravimetric (TG) analysis and single crystal X-ray diffraction. Single crystal X-ray diffraction analysis shows that complex 1 and complex 3 possesses the same structure as uninodal 6-connected 3D (three-dimensional) pcu topology framework with the point symbol (412.63), whereas complex 2 possesses an uninodal 3-connected hcb topology framework with the point symbol (63) and complex 4 displays a 4-connected sql topology framework with the point symbol of (44.62). In addition, the photocatalytic degradation properties of the four complexes have been investigated. Significantly, complex 4 is the best photocatalyst for the degradation of three organic dyes (MV/MB/RhB). Complex 2 is the good photocatalyst for the degradation of two organic dyes (RhB/MB). Complex 3 is the good photocatalyst for the degradation of two organic dyes (MV/MB) and complex 1 is the good photocatalyst for the degradation of only one organic dyes (MV). Image 1 [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]