Amino-substituted spirothiopyran as an initiator for self-assembly of gold nanoparticles
作者:Yasuhiro Shiraishi、Haruki Tanaka、Hirokatsu Sakamoto、Satoshi Ichikawa、Takayuki Hirai
DOI:10.1039/c5ra14752b
日期:——
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
当氨基取代的螺硫吡喃添加到含有金纳米粒子(AuNPs)的水溶液中时,在黑暗中于室温下会促进AuNPs的聚集。螺硫吡喃的硫原子由于供电子氨基的取代而具有高亲核性,并通过共价Au–S结合。这促进了螺硫吡喃的自发螺环开放并在AuNP表面上产生带正电荷的吲哚部分。这减少了AuNP之间的静电排斥并促进了它们的聚集。成功地改变螺硫吡喃的添加量,可以生产出大小可调(40-1300 nm),尺寸分布窄且标准偏差小于30%的AuNP聚集体。因此,该系统有可能成为AuNPs自组装的一种新的简单方法。