Comparison studies of hybrid lead halide [MPb2X7]2- (M = Cu, Ag; X = Br, I) chains: band structures and visible light driven photocatalytic properties.
Comparison studies of hybrid lead halide [MPb2X7]2- (M = Cu, Ag; X = Br, I) chains: band structures and visible light driven photocatalytic properties.
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DOI：
10.1039/c7dt00820a
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发表时间：
2017-07
影响因子：
4
通讯作者：
C. Yue;X. Lei;Xin-Xiu Lu;Yan Li;Juncheng Wei;Wei Wang;Yun-Dong Yin;Ning Wang
中科院分区：
文献类型：
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作者：
C. Yue;X. Lei;Xin-Xiu Lu;Yan Li;Juncheng Wei;Wei Wang;Yun-Dong Yin;Ning Wang
以过渡金属配合物阳离子染料为结构导向剂和光敏剂，合成了一系列无机-有机杂化金属卤化物，即[TM（2，2'-bipy）3]AgPb2I7 [TM = Ni（1）、Co（2）和Zn（3）]、[Co [TM（2，2 ′-bipy）3] CuPb_2Br_7（4）和[TM（2，2 ′-bipy）_3] AgPb_2Br_7 [TM = Ni（5）和Fe（6）]的合成和结构表征。化合物1-3的特征是由[Ag 2 I6]二聚体和[Pb 4 I14]四聚体缩合而成的一维[AgPb 2 I7]2-链，化合物4、5和6分别含有类似的一维[CuPb 2Br 7]2-和[AgPb 2Br 7]2-链。UV-Vis漫反射光谱测试表明，化合物1-6具有1.75-2.18 eV的窄禁带，在可见光照射下对有机污染物具有高效稳定的光催化降解活性。在标题化合物中，样品5显示出最高的光催化降解活性。在实验和理论研究的基础上，提出了它们稳定光催化活性的可能机理。
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.