Guest-Induced Photophysical Property Switching of Artificial Light-Harvesting Dendrimers

被引：63

作者：

Jeong, Young-Hwan ^{[1
]}

Son, Minjung ^{[1
]}

Yoon, Hongsik ^{[1
]}

Kim, Pyosang ^{[1
]}

Lee, Do-Hyung ^{[1
]}

Kim, Dongho ^{[1
]}

Jang, Woo-Dong ^{[1
]}

机构：

[1] Yonsei Univ, Dept Chem, Seoul 120749, South Korea

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2014年 / 53卷 / 27期

基金：

新加坡国家研究基金会;

关键词：

dendrimers; electron transfer; energy transfer; host-guest systems; porphyrin; PHOTOINDUCED ELECTRON-TRANSFER; MULTIPORPHYRIN ARRAYS; ZINC PORPHYRIN; ANTENNAE; ENERGY;

D O I：

10.1002/anie.201400835

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

An artificial light-harvesting multiporphyrin dendrimer (8P(Zn)P(FB)) composed of a focal freebase porphyrin (P-FB) with eight zinc(II) porphyrin (P-Zn) wings exhibited unique photophysical property switching in response to specific guest molecule binding. UV/Vis titration studies indicated stable 1: 2 host-guest complex formation between 8P(Zn)P(FB) and meso-tetrakis(4-pyridyl)-porphyrin (TPyP) for which the first and second association constants were estimated to be > 10(8) m(-1) and 3.0 x 10(7) m(-1), respectively. 8P(Zn)P(FB) originally shows 94% energy transfer efficiency from P-Zn to the focal P-FB. By the formation of the host-guest complex (8P(Zn)P(FB) 2TPyP) the emission intensity of 8P(Zn)P(FB) is significantly decreased, and an ultrafast charge separation state is generated. The energy transfer process from P-Zn wings to the P-FB core in 8P(Zn)P(FB) is almost entirely switched to an electron transfer process by the formation of 8P(Zn)P(FB)center dot 2TPyP.

引用

页码：6925 / 6928

页数：4

共 27 条

[1] ASSEMBLY AND CRYSTAL-STRUCTURE OF A PHOTOACTIVE ARRAY OF 5 PORPHYRINS [J].