Superatom Compounds, Clusters, and Assemblies: Ultra Alkali Motifs and Architectures

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• 作者：Arthur C. Reber ; Shiv N. Khanna ; A. Welford Castleman ; Jr.
• 刊名：Journal of the American Chemical Society
• 出版年：2007
• 出版时间：August 22, 2007
• 年：2007
• 卷：129
• 期：33
• 页码：10189 - 10194
• 全文大小：390K
• 年卷期：v.129,no.33(August 22, 2007)
• ISSN：1520-5126

文摘

It has recently been demonstrated that chosen clusters of specific size and composition canexhibit behaviors reminiscent of atoms in the periodic table and hence can be regarded as superatomsforming a third dimension. An Al₁₃ cluster has been shown to mimic the behavior of halogen atoms. Here,we demonstrate that superatom compounds formed by combining superhalogens (Al₁₃) with superalkalis(K₃O and Na₃O) can exhibit novel chemical and tunable electronic features. For example, Al₁₃(K₃O)₃ isshown to have low first and second ionization potentials of 2.49 and 4.64 eV, respectively, which are lowerthan alkali atoms and can be regarded as ultra alkali motifs. Al₁₃K₃O is shown to be a strongly boundmolecule that can be assembled into stable superatom assemblies (Al₁₃K₃O)_n with Al₁₃ and K₃O as thesuperatom building blocks. The studies illustrate the potential of creating new materials with anunprecedented control on physical and electronic properties.