Single-Crystal and Electronic Structure of a 1.3 nm Indium Phosphide Nanocluster

详细信息    查看全文

• 作者：Dylan C. Gary ; Sarah E. Flowers ; Werner Kaminsky ; Alessio Petrone ; Xiaosong Li ; Brandi M. Cossairt
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：February 10, 2016
• 年：2016
• 卷：138
• 期：5
• 页码：1510-1513
• 全文大小：316K
• ISSN：1520-5126

文摘

Magic-sized nanoclusters have been implicated as mechanistically relevant intermediates in the synthesis of group III-V quantum dots. Herein we report the single-crystal X-ray diffraction structure of a carboxylate-ligated indium phosphide magic-sized nanocluster at 0.83 ? resolution. The structure of this cluster, In₃₇P₂₀(O₂CR)₅₁, deviates from that of known crystal phases and possesses a non-stoichiometric, charged core composed of a series of fused 6-membered rings. The cluster is completely passivated by bidentate carboxylate ligands exhibiting predominantly bridging binding modes. The absorption spectrum of the cluster shows an asymmetric line shape that is broader than what would be expected from a homogeneous sample. A combination of computational and experimental evidence suggests that the spectral line width is a result of multiple, discrete electronic transitions that couple to vibrations of the nanocrystal lattice. The product of reaction of this nanocluster with 1 equiv of water has also been structurally characterized, demonstrating site selectivity without a drastic alteration of electronic structure.