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• 作者：Jing Zhao ; Jingjing Liang ; Jiangfang Chen ; Yingli Pan ; Yong Zhang ; Dingxian Jia
• 刊名：Inorganic Chemistry
• 出版年：2011
• 出版时间：March 21, 2011
• 年：2011
• 卷：50
• 期：6
• 页码：2288-2293
• 全文大小：895K
• 年卷期：v.50,no.6(March 21, 2011)
• ISSN：1520-510X

文摘

Novel cobalt polyselenidoarsenate [Co(phen)₃][As₂Se₂(渭-Se₃)(渭-Se₅)] (1; phen = 1,10-phenanthroline) was methanolothermally synthesized by the reaction of CoCl₂, As₂O₃, and Se templated by phen in a CH₃OH solvent at 130 掳C. The same reaction in a H₂O solvent yielded cobalt selenidoarsenate [Co(phen)₃]₂[As₈Se₁₄] (2). In 1, the AsSe⁺ units are alternately joined by the 渭-Se₃^{2鈭?/sup> and 渭-Se₅2鈭?/sup> bridging ligands to form a novel helical polyselenidoarsenate chain [As₂Se₂(渭-Se₃)(渭-Se₅)2鈭?/sup>]_{鈭?/sub>. In 2, eight pyramidal AsSe3 units are connected via corner sharing into the new member of the selenidoarsenate aggregate [As8Se14]4鈭?/sup> with a condensation grade of 0.571, which represents the first discrete selenidoarsenate(III) with a condensation grade of above 0.50. The octahedral complex [Co(phen)3]2+ is formed in situ to act as a countercation in compounds 1 and 2. 1 and 2 exhibit steep absorption band gaps at 2.09 and 2.16 eV, respectively.}}