Visible-Light-Driven Photocatalysts of Metal鈥揙rganic Frameworks Derived from Multi-Carboxylic Acid and Imidazole-Based Spacer

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• 作者：Lili Wen ; Jinbo Zhao ; Kangle Lv ; Yuhui Wu ; Kejian Deng ; Xiaoke Leng ; Dongfeng Li
• 刊名：Crystal Growth & Design
• 出版年：2012
• 出版时间：March 7, 2012
• 年：2012
• 卷：12
• 期：3
• 页码：1603-1612
• 全文大小：633K
• 年卷期：v.12,no.3(March 7, 2012)
• ISSN：1528-7505

文摘

Five new metal鈥搊rganic 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 (H₄btec) and 4,4鈥?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 鈥H radicals on compound 5/H₂O interface via photocatalytic reactions is much higher than that of 1 and 2, implying that the formation rate of 鈥H radicals during photocatalysis is in agreement with photocatalytic activity and the formation rate of 鈥H radicals is an important factor influencing photocatalytic performance.