Ba2AsGaSe5: A New Quaternary Selenide with the Novel [AsGaSe5]4鈥?/sup> Cluster and Interesting Photocatalytic Properties

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• 作者：Chao Li ; Xiaoshuang Li ; Hongwei Huang ; Jiyong Yao ; Yicheng Wu
• 刊名：Inorganic Chemistry
• 出版年：2015
• 出版时间：October 19, 2015
• 年：2015
• 卷：54
• 期：20
• 页码：9785-9789
• 全文大小：330K
• ISSN：1520-510X

文摘

The new zero-dimensional selenide Ba₂AsGaSe₅ was synthesized via a solid-state reaction at 900 掳C. It belongs to the orthorhombic space group Pnma with a = 12.632(3) 脜, b = 8.9726(18) 脜, c = 9.2029(18) 脜, and Z = 4. In the structure, the As atom adopts trigonal-pyramidal coordination owing to the stereochemically active 4s² lone pair electrons and the Ga atom is tetrahedrally coordinated with four Se atoms. The AsSe₃ trigonal pyramids share edges with GaSe₄ tetrahedra to form novel [AsGaSe₅]^{4鈥?/sup> clusters, which are further separated from each other by Ba2+ cations. The optical band gap was determined as 1.39 eV according to UV鈥搗is鈥揘IR diffuse reflectance spectroscopy. Interestingly, the photocatalytic behavior investigated by decomposing rhodamine B indicates that the compound displays a 6.5 times higher photocatalytic activity than does P25.}