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利用嵌入磷酸锆层状基质中的铱和铑配合物进行可见光驱动的氢气生产。

Visible-light driven H₂ production utilizing iridium and rhodium complexes intercalated into a zirconium phosphate layered matrix.

作者信息

Mori Kohsuke, Aoyama Junya, Kawashima Masayoshi, Yamashita Hiromi

机构信息

Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan.

出版信息

Dalton Trans. 2014 Jul 21;43(27):10541-7. doi: 10.1039/c3dt53110d. Epub 2014 Apr 3.

Abstract

Intercalation of photosensitizer cyclometalated iridium(III) ([Ir(ppy)2(bpy)]BF6) and proton reduction catalyst tris-2,2'-bipyridyl rhodium(III) (Rh(bpy)33) complexes into a layered zirconium phosphate (ZrP) with an interlayer distance of 10.3 Å has been attained with the aim of developing a visible-light responsible photocatalyst for H2 production in aqueous media. Ir L(III)-edge and Rh K-edge X-ray absorption fine structure (XAFS) measurement indicates that both Ir and Rh complexes are intercalated into the layered interspace without structural change around metal environments. The photoluminescence emission of the exchanged Ir complex due to a triplet ligand-to-ligand charge transfer ((3)LLCT) and a metal-to-ligand charge-transfer ((3)MLCT) transition near 560 nm decreases with increasing the amount of adjacent Rh complexes, suggesting the occurrence of electron transfer from Ir complex to Rh complex. The Ir-Rh/ZrP catalyst exhibits both visible-light sensitization and H2 production from aqueous solution in the absence of an electron mediator. The photocatalytic activities are strongly dependent on the ratio of the components, and the maximum activity can be attained with a molar ratio of Ir : Rh = 10 : 1.

摘要

为了开发一种在水介质中用于制氢的可见光响应型光催化剂,已将光敏剂环金属化铱(III)([Ir(ppy)2(bpy)]BF6)和质子还原催化剂三-2,2'-联吡啶铑(III)(Rh(bpy)33)配合物嵌入层间距为10.3 Å的层状磷酸锆(ZrP)中。Ir L(III)边和Rh K边X射线吸收精细结构(XAFS)测量表明,Ir和Rh配合物均嵌入层间空间,且金属环境周围结构未发生变化。随着相邻Rh配合物数量的增加,由于在560 nm附近的三重态配体到配体电荷转移((3)LLCT)和金属到配体电荷转移((3)MLCT)跃迁,交换后的Ir配合物的光致发光发射减弱,这表明发生了从Ir配合物到Rh配合物的电子转移。在没有电子介质的情况下,Ir-Rh/ZrP催化剂既表现出可见光敏化作用,又能从水溶液中产生氢气。光催化活性强烈依赖于各组分的比例,当Ir : Rh的摩尔比为10 : 1时可达到最大活性。

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