Competitive Photochemical Reactivity in a Self-Assembled Monolayer on a Colloidal Gold Cluster
作者:Jun Hu、Jian Zhang、Fang Liu、Kevin Kittredge、James K. Whitesell、Marye Anne Fox
DOI:10.1021/ja003180l
日期:2001.2.1
shell−core cluster 2 produced by depositing a self-assembled monolayer (SAM) of 6-thiohexyl-3-nitro-4-(4‘-stilbenoxymethyl)-benzoate (1) on a nanoparticulate gold colloid preserves normal solution-phase photoreactivity of the trans-stilbene and o-nitrobenzyl ether moieties, but shows quenched fluorescence. Nearest-neighbor aggregation is weaker for 1 bound to the roughly spherical colloidal gold particle
通过在纳米颗粒金胶体上沉积 6-thiohexyl-3-nitro-4-(4'-stilbenoxymethyl)-benzoate (1) 的自组装单层 (SAM) 产生的壳核簇 2 保持正常的溶液相光反应性反式二苯乙烯和邻硝基苄基醚部分,但显示淬灭荧光。1 绑定到大致球形胶体金颗粒(在簇 2 中)的最近邻聚集比绑定到平面金表面的类似芪类更弱。与观察到的作为 SAM 在平面金表面上附加的芪基烷基硫化物的光化学反应性不同,这些壳核纳米复合材料 2 中存在的发色团表现出有效的反式到顺式光异构化并阻止了 [2 + 2] 光二聚化。光异构化和光裂解的波长选择性被证明是难以捉摸的,