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Surface-Ligand Tuned Reversible Transformations in Aqueous Environments Between CdSe Magic-Size Clusters and Their Precursor Compounds
Small ( IF 13.0 ) Pub Date : 2023-10-08 , DOI: 10.1002/smll.202304277
Qingyuan Chen 1 , Yu Zhang 2 , Shuo Chen 3 , Yuehui Liu 3 , Chunchun Zhang 4 , Meng Zhang 1 , Kui Yu 1, 3
Affiliation  

That magic-size clusters (MSCs) have their counterpart precursor compounds (PCs) has not been generally accepted by expertise circles. Here, experimental evidence to support this new concept is presented. With aqueous-phase CdSe MSCs as a model system, it is shown that when the MSCs are dispersed in water containing a certain amount of L-cysteine (Cys), the MSCs disappear slowly. Upon the addition of CdCl2, the MSCs recover. It is proposed that after dispersing, the MSCs transform to their quasi-isomeric, non-absorbing PCs upon Cys addition. In the presence of CdCl2, the PCs transform back to the MSCs due to Cys elimination. The surface ligand Cys of the MSCs plays a significant role in the reversible transformations. The present study provides compelling evidence that absorbing MSCs have their non-absorbing PCs. The study findings suggest that the transformation between two MSCs that display absorption spectral shifts in a stepwise pattern is assisted by their PCs.

中文翻译:


水环境中 CdSe 幻尺寸簇及其前体化合物之间的表面配体调节可逆转变



神奇大小的簇 (MSC) 具有其对应的前体化合物 (PC) 尚未被专业界普遍接受。在这里,提出了支持这一新概念的实验证据。以水相CdSe MSCs为模型体系,结果表明,当MSCs分散在含有一定量L-半胱氨酸(Cys)的水中时,MSCs缓慢消失。添加CdCl 2后,MSC 恢复。据推测,分散后,MSC 在添加 Cys 后转化为准异构体、非吸收性 PC。在 CdCl 2存在的情况下,由于 Cys 消除,PC 转回 MSC。 MSCs的表面配体Cys在可逆转化中发挥着重要作用。本研究提供了令人信服的证据,证明吸收性 MSC 具有非吸收性 PC。研究结果表明,以逐步模式显示吸收光谱变化的两个 MSC 之间的转化得到了 PC 的协助。
更新日期:2023-10-08
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