To functionalize Au MPCs (monolayer-protected gold clusters), ligand place-exchange reactions provide a convenient route in which the initial capping ligands are displaced by mixing the MPCs with an excess amount of incoming ones. However, literature reports show that the diameters of the modified products do not always stay unchanged. Because of the diversity of experimental conditions carried out in the documented studies, there is still a lack of comprehensive understanding concerning the size evolution. Herein, carefully controlled and examined parameters include the initial size of MPCs Au _(101)(PPh_3)_(21)Cl_5, the reaction time, the concentration of incoming ligands, a homologous series of incoming ligands, and the anchoring headgroups. The results show that the final particle size is determined by the strength of headgroup-gold adsorption which is correlated with the curvature of the final product in a thermodynamic model derived from Gibbs-Thomson equation.
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机译:为了功能化 Au MPC(单层保护的金簇),配体位置交换反应提供了一种方便的途径,通过将 MPC 与过量的进料混合来置换初始加帽配体。然而,文献报告显示,改性产品的直径并不总是保持不变。由于记录在案的研究中进行的实验条件的多样性,对尺寸演变仍然缺乏全面的了解。在此,仔细控制和检查的参数包括MPC的初始大小[Au _(101)(PPh_3)_(21)Cl_5]、反应时间、传入配体的浓度、传入配体的同源系列和锚定头基。结果表明,在Gibbs-Thomson方程推导的热力学模型中,最终粒径由头群金吸附强度决定,该强度与最终产物的曲率相关。
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