Four new metal–organic frameworks based on diverse secondary building units: sensing and magnetic properties

摘要: Four new metal–organic frameworks (MOFs), {[Zn3(L)(OH)(H2O)5]·NMP·2H2O}n (1), {[H2N(Me)2][Zn2(L)(H2O)]·DMF·H2O}n (2), {[Co5(L)2(H2O)11]·2H2O}n (3) and {[Mn5(L)2(H2O)12]·6H2O}n (4), were assembled employing a symmetrical V-shaped rigid multicarboxylic acid ligand H5L (H5L = 2,4-di(3′,5′-dicarboxylphenyl)benzoic acid) with different metal ions, resulting in versatile as well various types of coordination modes H5L. 1 forms three-dimensional (3D) 4-connected sra net based on trinuclear [Zn3(μ3-OH)(μ2-COO)(μ1-COO)4] clusters, while 2 displays 3D (4,6)-connected two binuclear [Zn2(μ2-COO)2(μ1-COO)4] [Zn2(μ2-COO)4] clusters. 3 4 contain similar [M3(μ2-COO)4(μ1-COO)2] (3, M Co; 4, Mn) clusters but result 2D frameworks, respectively. show solid-state luminescence properties at ambient temperature. Meanwhile, shows high selectivity sensitivity for not only Fe3+ cations also CrO42−, Cr2O72− MnO4− anions via quenching effect low detection limit, which thus means that it could be potential crystalline material detecting these anions. The mechanisms the sensing are discussed detail. In addition, have presence antiferromagnetic interactions between ions.