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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]

Two novel Co (II) MOFs based on 5-(4-(imidazolyl-1-yl)phenyl) isophthalic acid (H 2 L), namely [Co(L)(tib)(H 2 O) 2 ] n (CP 1) and [Co(L)(bip) 0.5 ] n (CP 2) (tib ​= ​1,3,5-tirs (1-imidazolyl) benzene, bip ​= ​3,5-bis(1-imidazolyl) pyridine ether) have been synthesized under solvothermal conditions and characterized by powder X-ray diffraction, single crystal X-ray diffraction. The photodegradation studies demonstrate that CPs 1 – 2 show high-efficiency degradation of MV (Methyl violet), and the mechanism studies demonstrate that the main active species are ⋅OH radicals. Meanwhile, electrochemistry studies demonstrate that CPs 1 – 2 can catalyze water oxidation under alkaline conditions, and CPs 1 – 2 only need the overpotential of 348 ​mV–760 mV to deliver the current density of 1 ​mA ​cm−2. Two novel Co (II) MOFs (CP 1 and CP 2) have been synthesized by H 2 L, tib, and bip. The photodegradation studies demonstrate that CPs 1-2 show high-efficiency degradation of MV. Simultaneously, electrochemistry studies show that CPs 1-2 could catalyze water oxidation with relatively low overpotential. [Display omitted] • Two novel Co-based MOFs were synthesized by solvothermal method. • Exhibit efficient photocatalytic degradation abilities towards MV/MB in aqueous solution. • Only need the overpotential of 348 ​mV–760 mV to deliver the current density of 1 ​mA ​cm−2. [ABSTRACT FROM AUTHOR]