四川大学余睽团队报道了胶体CdTeSe幻数团簇中的转化途径。相关研究成果于2021年11月29日发表在《德国应用化学》。
该文讨论了在胶体三元幻数团簇（MSCs）中一个很少研究的转变。
研究人员报告了在室温下首次观察到从三元CdTeSe MSC-399到MSC-422的转变。该两种MSC类型分别在399和422 nm处显示出强烈的光学吸收共振，与对应的前体化合物（PCs）是准异构体。二元CdTe和CdSe样品是在核前阶段（也称为诱导期（IP））制备的。将它们混合并放置在甲苯和辛胺的混合物中后，发现发生了转化，并通过添加CdSe IP样品来辅助转化。二元IP样品包含相应的二元PCs和单体（Mo）以及片段（Fr）。
研究人员认为，转化途径由相应的三元PCs实现，涉及取代反应，即CdTeSe PC-399+CdSe（Mo/Fr）-1 CdTeSe PC-422+CdSe（Mo/Fr）-2。该研究提供了对MSCs形成特征的深入理解。
附：英文原文
Title: Transformation Pathways in Colloidal CdTeSe Magic-Size Clusters
Author: Yusha Yang, Yang Li, Chaoran Luan, Nelson Rowell, Shanling Wang, Chunchun Zhang, Wen Huang, Xiaoqin Chen, Kui Yu
Issue&Volume: 2021-11-29
Abstract: A rarely studied transformation in colloidal ternary magic-size clusters (MSCs) is addressed. We report the first observation of the transformation from ternary CdTeSe MSC-399 to MSC-422, which occurs at room temperature. These two MSC types display sharp optical absorption resonances at 399 and 422 nm respectively, and are related in that they are quasi isomers, together with their counterpart precursor compounds (PCs). Binary CdTe and CdSe samples were prepared in the prenucleation stage also called the induction period (IP). After they were mixed and placed in a mixture of toluene and octylamine, the transformation was found to take place and to be assisted by the addition of the CdSe IP sample. A binary IP sample contains corresponding binary PCs and monomers (Mo) and fragments (Fr). We argue that the transformation pathway is enabled by the corresponding ternary PCs, involving the substitution reaction, namely CdTeSe PC-399 + CdSe (Mo/Fr)-1 CdTeSe PC-422 + CdSe (Mo/Fr)-2. The present study provides an in-depth understanding of the formation characteristics of the MSCs.
DOI: 10.1002/anie.202114551
Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202114551
