Competitive photochemical reactivity in a self-assembled monolayer on a colloidal gold cluster

被引：114

作者：

Hu, J ^{[1
]}

Zhang, J ^{[1
]}

Liu, F ^{[1
]}

Kittredge, K ^{[1
]}

Whitesell, JK ^{[1
]}

Fox, MA ^{[1
]}

机构：

[1] N Carolina State Univ, Dept Chem, Raleigh, NC 27695 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2001年 / 123卷 / 07期

关键词：

D O I：

10.1021/ja003180l

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A 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 (in cluster 2) than for analogous stilbenoids: bound to a planar gold surface. Unlike the observed photochemical reactivity of stilbenylalkyl sulfides appended as SAMs on planar gold surfaces, the chromophores present in these shell-core nanocomposites 2 exhibit efficient trans-to-cis photoisomerization and blocked [2 + 2] photodimerization. Wavelength selectivity for photoisomerization and photocleavage proved to be elusive, but tripler sensitization of the geometric isomerization took place without photorelease of the attached group.

引用

页码：1464 / 1470

页数：7

共 42 条

[1] Monolayer-protected clusters with fluorescent dansyl ligands [J].