Amino-Substituted Spirothiopyran as an Initiator for Self-Assembly of Gold Nanoparticles
Amino-Substituted Spirothiopyran as an Initiator for Self-Assembly of Gold Nanoparticles
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氨基取代螺噻喃作为金纳米颗粒自组装引发剂
DOI：
10.1039/c5ra14752b
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发表时间：
2015
期刊：
影响因子：
3.9
通讯作者：
and Takayuki Hirai
中科院分区：
文献类型：
--
作者：
Yasuhiro Shiraishi;Haruki Tanaka;Hirokatsu Sakamoto;Satoshi Ichikawa;and Takayuki Hirai
氨基取代的螺噻喃，当添加到含有金纳米颗粒（AuNPs）的水溶液中时，促进AuNPs在室温下在黑暗中聚集。螺噻喃的硫原子由于取代了给电子的氨基而具有高度的亲核性，并且通过共价Au-S结合与AuNP表面结合。这促进了螺噻喃的自发螺环开放，并在AuNP表面上产生带正电荷的吲哚啉部分。这降低了AuNP之间的静电排斥并促进它们的聚集。改变添加的螺噻喃的量成功地产生具有可调尺寸（40-1300 nm）和窄尺寸分布的AuNP聚集体，标准偏差小于30%。因此，该系统有可能成为一种新的简单的方法自组装的金纳米粒子。
An amino-substituted spirothiopyran, when added to an aqueous solution containing gold nanoparticles (AuNPs), promotes aggregation of AuNPs at room temperature in the dark. The sulfur atom of the spirothiopyran has high nucleophilicity due to the substitution of electron-donating amino groups and is bound to the AuNP surface via covalent Au–S binding. This promotes spontaneous spirocycle opening of the spirothiopyran and produces a positively charged indolinium moiety on the AuNP surface. This reduces electrostatic repulsion between the AuNPs and promotes their aggregation. Changing the amount of the spirothiopyran added successfully produces AuNP aggregates with tunable sizes (40–1300 nm) and narrow size distributions with standard deviation being less than 30%. This system therefore has potential to be a new simple method for self-assembly of AuNPs.