Zhang Hai, Luan Chaoran, Gao Dong, Zhang Meng, Rowell Nelson, Willis Maureen, Chen Meng, Zeng Jianrong, Fan Hongsong, Huang Wen, Chen Xiaoqin, Yu Kui
Engineering Research Center in Biomaterials, Sichuan University, Chengdu, Sichuan, 610065, P. R. China.
Laboratory of Ethnopharmacology, West China School of Medicine, Chengdu, Sichuan, 610065, P. R. China.
Angew Chem Int Ed Engl. 2020 Sep 21;59(39):16943-16952. doi: 10.1002/anie.202005643. Epub 2020 Jul 27.
Little is known about the pathway of room-temperature formation of ternary CdTeSe magic-size clusters (MSCs) obtained by mixing binary CdTe and CdSe induction period samples containing binary precursor compounds (PCs) of MSCs, monomers (Ms), and fragments (Fs). Also, unestablished are dispersion effects that occur when as-mixed samples (without incubation) are placed in toluene (Tol) and octylamine (OTA) mixtures. The resulting ternary MSCs, exhibiting a sharp optical absorption peak at 399 nm, are labelled CdTeSe MSC-399, and their PCs are referred to as CdTeSe PC-399. When the amount of OTA is relatively small, single-ensemble MSC-399 evolved without either binary CdTe or CdSe MSCs. When the OTA amount is relatively large, CdTe MSC-371 appeared initially and then disappeared, while single-ensemble MSC-399 developed more deliberately. The larger the OTA amount, the more slowly these changes proceeded. The substitution reaction of CdTe PC + CdSe M/F↔CdTeSe PC-399 + CdTe M/F is proposed to be rate-determining for the MSC-399 formation in a Tol and OTA mixture. This study provides further understanding of the transformation pathway between MSCs.
通过混合含有二元前驱体化合物（PCs）、单体（Ms）和片段（Fs）的二元CdTe和CdSe诱导期样品来制备三元CdTeSe魔法尺寸团簇（MSCs），关于其室温形成途径知之甚少。此外，当混合样品（不进行孵育）置于甲苯（Tol）和辛胺（OTA）混合物中时，所产生的分散效应也尚未明确。所得的三元MSCs在399 nm处呈现出尖锐的光吸收峰，被标记为CdTeSe MSC-399，其PCs被称为CdTeSe PC-399。当OTA的量相对较小时，单一组分的MSC-399在没有二元CdTe或CdSe MSCs的情况下演化形成。当OTA的量相对较大时，CdTe MSC-371最初出现然后消失，而单一组分的MSC-399则更缓慢地形成。OTA的量越大，这些变化进行得越慢。在Tol和OTA混合物中，CdTe PC + CdSe M/F↔CdTeSe PC-399 + CdTe M/F的取代反应被认为是MSC-399形成的速率决定步骤。这项研究进一步加深了对MSCs之间转化途径的理解。
