Pramod P, Sudeep P K, Thomas K George, Kamat Prashant V
J Phys Chem B. 2006 Oct 26;110(42):20737-41. doi: 10.1021/jp064878+.
Design of nanohybrid systems possessing several ruthenium trisbipyridine (Ru(bpy)(3)(2+)) chromophores on the surface of gold nanoparticles, by adopting a place exchange reaction, was reported and their photophysical properties were tuned by varying the density of chromophores. The charge shift between the excited and ground-state Ru(bpy)(3)(2+) chromophores was reported for the first time, leading to the formation of Ru(bpy)(3)(+) and Ru(bpy)(3)(3+). Electron-transfer products were not observed on decreasing the concentration of Ru(bpy)(3)(2+) functionalized on Au nanoparticles or in a saturated solution of unbound chromophores. The close proximity of the chromophores on periphery of the gold core may lead to an electron transfer reaction and the products sustained for several nanoseconds before undergoing recombination, probably due to the stabilizing effect of the polar ethylene glycol moieties embedded between the chromophore groups.
报道了通过采用配体交换反应在金纳米颗粒表面设计具有多个三联吡啶钌（Ru(bpy)(3)(2+)）发色团的纳米杂化体系，并通过改变发色团密度来调节其光物理性质。首次报道了激发态和基态Ru(bpy)(3)(2+)发色团之间的电荷转移，导致形成Ru(bpy)(3)(+)和Ru(bpy)(3)(3+)。在降低金纳米颗粒上功能化的Ru(bpy)(3)(2+)浓度或在未结合发色团的饱和溶液中未观察到电子转移产物。金核周围发色团的紧密接近可能导致电子转移反应，并且产物在重组之前持续存在数纳秒，这可能是由于嵌入发色团基团之间的极性乙二醇部分的稳定作用。
