Comparison studies of hybrid lead halide [MPb2X7]2- (M = Cu, Ag; X = Br, I) chains: band structures and visible light driven photocatalytic properties

作者：Yue, Cheng-Yang^*; Lei, Xiao-Wu^*; Lu, Xin-Xiu; Li, Yan; Wei, Jun-Chao; Wang, Wei; Yin, Yun-Dong; Wang, Ning

来源：Dalton Transactions, 2017, 46(28): 9235-9244.

DOI：10.1039/c7dt00820a

• METAL-ORGANIC FRAMEWORK
• CRYSTAL-STRUCTURES
• OPTICAL-PROPERTIES
• IODOPLUMBATE
• COMPLEXES
• CATIONS
• PEROVSKITES
• POLYOXOMETALATE
• TEMPLATES
• MECHANISM

By using transition-metal (TM) complex cationic dyes as structure-directing agents and photosensitizers, a series of inorganic-organic hybrid metal halides, namely, [TM(2,2'-bipy)(3)]AgPb2I7 [TM = Ni (1), Co (2) and Zn (3)], [Co(2,2'-bipy)(3)]CuPb2Br7 (4) and [TM(2,2'-bipy)(3)]AgPb2Br7 [TM = Ni (5) and Fe (6)], have been solvothermally prepared and structurally characterized. Compounds 1-3 feature 1D [AgPb2I7](2-) chains built from the condensation of [Ag2I6] dimers and [Pb4I14] tetramers, and compounds 4, 5 and 6 contain similar 1D [CuPb2Br7](2-) and [AgPb2Br7](2-) chains, respectively. UV-Vis diffuse reflectance measurements reveal narrow band gaps of 1.75-2.18 eV for compounds 1-6, which lead to efficient and stable photocatalytic degradation activities over organic pollutants under visible light irradiation. Among the title compounds, sample 5 shows the highest photocatalytic degradation activity. The possible mechanism for their stable photocatalytic activities is proposed based on the experimental and theoretical studies.

• 出版日期2017-7-28
• 单位厦门大学; 济宁学院