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Electrophilic substitution reaction as a facile and general approach for reactive removal of native ligands from nanocrystals surface

机译：电泳取代反应作为反应性除去纳米晶体表面的天然配体的容易和一般方法

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摘要

Surface property that strongly affects physical and chemical performances of inorganic nanocrystals (NCs) is a key enabler for NCs applications. Here, we report a facile, versatile and general strategy for reactive removal of NCs surface ligands based on electrophilic substitution reaction, in which an electrophile directly reacts with the electron-rich coordinating headgroup of surface-tethered ligands to form a non-coordinating product. This process leads to the break of NC-ligand bond, thereby achieving reactive removal of surface ligands. Based on this strategy, various hydrophobic NCs with different compositions and morphologies can be transferred into polar and hydrophilic media while preserving their size and shape. More importantly, the treated NCs present a great improvement in catalytic and biological performances in comparison with the untreated counterparts. This work not only provides a versatile ligand removal strategy for NCs surface modification but also opens up more opportunities for applications in the fields of electronics, catalysis and biotechnology.
机译：强烈影响无机纳米晶体（NCS）的物理和化学性能的表面特性是NCS应用的关键能器。在此，我们报告了基于亲电取代反应的NCS表面配体的反应性除去的容易性，通用和一般策略，其中亲电直接反应表面束缚配体的富含电子配位，形成非配位产品。该方法导致NC-配体键的断裂，从而实现表面配体的反应除去。基于该策略，可以将具有不同组成和形态的各种疏水性NC转移到极性和亲水介质中，同时保持其尺寸和形状。更重要的是，与未处理的对应物相比，治疗的NCS呈现出催化和生物学性能的巨大改善。这项工作不仅为NCS表面修改提供了多功能的配体去除策略，而且还为电子，催化和生物技术领域的应用开辟了更多机会。

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