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首页> 外文期刊>Crystal growth & design >Visible-light-driven photocatalysts of metal-organic frameworks derived from multi-carboxylic acid and imidazole-based spacer
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Visible-light-driven photocatalysts of metal-organic frameworks derived from multi-carboxylic acid and imidazole-based spacer

机译：可见光驱动的多羧酸和咪唑基间隔基衍生的金属-有机骨架的光催化剂

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摘要

Five new metal-organic frameworks [M(btec) _(0.5)(bimb)] _n (1) (M = Co (1), Ni (2), Cu (3), Zn (4)) and [Cd(btec) _(0.5)(bimb) _(0.5)] _n (5), were obtained by reactions of the conjugated 1,2,4,5-benzenetetracarboxylic acid (H _4btec) and 4,4′-bis(1- imidazolyl)biphenyl (bimb) with corresponding metal salts under hydrothermal conditions, respectively. MOFs 1-5 show different structures and topologies: compounds 1 and 4 are isomorphic, which possess typical PtS 3D nets; compound 2, 3 and 5 exhibit 2D layer structure, NbO 3D network and (4,6)-connected 3D binodal topology, respectively. Notably, compounds 1, 2, and 5 represent the rare example of MOFs-based visible-light-driven photocatalysts and show good stability toward photocatalysis. Furthermore, compound 5 is photocatalytically more active than 1 and 2 because of the relatively narrower band gap calculated from LMCT transitions. In addition, the formation rate of ?OH radicals on compound 5/H _2O interface via photocatalytic reactions is much higher than that of 1 and 2, implying that the formation rate of ?OH radicals during photocatalysis is in agreement with photocatalytic activity and the formation rate of ?OH radicals is an important factor influencing photocatalytic performance.
机译：五个新的金属有机框架[M（btec）_（0.5）（bimb）] _ n（1）（M = Co（1），Ni（2），Cu（3），Zn（4））和[Cd（ btec）_（0.5）（bimb）_（0.5）] _n（5）是通过共轭的1,2,4,5-苯四甲酸（H _4btec）与4,4'-双（1-咪唑基）联苯（bimb）与相应的金属盐分别在水热条件下。 MOF 1-5显示不同的结构和拓扑：化合物1和4是同构的，具有典型的PtS 3D网络。化合物2、3和5分别具有2D层结构，NbO 3D网络和（4,6）连接的3D二面体拓扑。值得注意的是，化合物1、2和5代表了基于MOF的可见光驱动的光催化剂的稀有实例，并显示出对光催化的良好稳定性。此外，由于从LMCT跃迁计算出的带隙相对较窄，因此化合物5比1和2具有更高的光催化活性。另外，化合物5 / H _2O界面上通过光催化反应形成的？OH自由基的形成速率比1和2高得多，这表明在光催化过程中？OH自由基的形成速率与光催化活性相一致。 OH自由基的比率是影响光催化性能的重要因素。

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