Hybrid Photoactive Assemblies: Electron Injection from Host-Guest Complexes into Semiconductor Nanoparticles
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- 作者：Cynthia Pagba ; Giovanni Zordan ; Elena Galoppini ; Eugene L. Piatnitski ; Sarmimala Hore ; Kurt Deshayes ; and Piotr Piotrowiak
- 刊名：Journal of the American Chemical Society
- 出版年：2004
- 出版时间：August 18, 2004
- 年：2004
- 卷：126
- 期：32
- 页码：9888 - 9889
- 全文大小：125K
- 年卷期：v.126,no.32(August 18, 2004)
- ISSN：1520-5126
文摘
Novel ternary assemblies consisting of fully encapsulated host-guest complexes (hemicarceplexes) and wide band gap semiconductor nanoparticles were investigated. The water-soluble amphiphilic host (octacarboxyhemicarcerand) traps the hydrophobic chromophore within its cavity and binds to the surface of metal oxide nanoparticles. Fluorescence quenching and fast charge injection, kforward 
7 × 109 s-1, from the S2 state of encapsulated azulene were observed. Charge recombination proceeds at a much lower rate of 2 × 107 s-1. Interestingly, the recombination kinetics is homogeneous, suggesting that electron tunneling through the wall of the "molecular container" is the rate-limiting step of the process.
7 × 109 s-1, from the S2 state of encapsulated azulene were observed. Charge recombination proceeds at a much lower rate of 2 × 107 s-1. Interestingly, the recombination kinetics is homogeneous, suggesting that electron tunneling through the wall of the "molecular container" is the rate-limiting step of the process.