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

作者：Yan, Yang-Tian; Zhang, Wen-Yan^*; Zhang, Fang; Cao, Feng; Yang, Rui-Feng; Wang, Yao-Yu; Hou, Lei^*

来源：Dalton Transactions, 2018, 47(5): 1682-1692.

DOI：10.1039/c7dt04696k

• STRUCTURED EU-MOF
• COORDINATION POLYMERS
• SELECTIVE DETECTION
• CR(VI) IONS
• LUMINESCENT SENSOR
• SINGLE-CRYSTAL
• SENSITIVE DETECTION
• FLUORESCENT-PROBE
• CATION-EXCHANGE
• GAS-ADSORPTION

Four new metal-organic frameworks (MOFs), {[Zn-3(L)(OH)(H2O)(5)]center dot NMP center dot 2H(2)O}(n) (1), {[H2N(Me)(2)][Zn-2(L) (H2O)]center dot DMF center dot H2O}(n) (2), {[Co-5(L)(2)(H2O)(11)]center dot 2H(2)O}(n) (3) and {[Mn-5(L)(2)(H2O)(12)]center dot 6H(2)O}(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 frameworks as well as various types of coordination modes of H5L. 1 forms a three-dimensional (3D) 4-connected sra net based on trinuclear [Zn-3(mu(3)-OH)(mu(2)-COO)(mu(1)-COO)(4)] clusters, while 2 displays a 3D (4,6)-connected net based on two types of binuclear [Zn-2(mu(2)-COO)(2)(mu(1)-COO)(4)] and [Zn-2(mu(2)-COO)(4)] clusters. 3 and 4 contain similar [M-3(mu(2)-COO)(4)(mu(1)-COO)(2)] (3, M = Co; 4, M = Mn) clusters but result in different 4-connected 3D and 2D frameworks, respectively. 1 and 2 show solid-state luminescence properties at ambient temperature. Meanwhile, 1 shows high selectivity and sensitivity for not only Fe3+ cations but also for CrO42-, Cr2O72- and MnO4- anions via a luminescence quenching effect with a low detection limit, which thus means that it could be a potential crystalline material for detecting these anions. The mechanisms of the quenching effect and sensing properties of 1 are discussed in detail. In addition, 3 and 4 have the presence of antiferromagnetic interactions between the metal ions.

• 出版日期2018-2-7
• 单位西北大学