Guest-induced photophysical property switching of artificial light-harvesting dendrimers

Young Hwan Jeong, Minjung Son, Hongsik Yoon, Pyosang Kim, Do Hyung Lee, Dongho Kim, Woo Dong Jang

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

An artificial light-harvesting multiporphyrin dendrimer (8P ZnPFB) composed of a focal freebase porphyrin (P FB) with eight zinc(II) porphyrin (PZn) 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 8PZnPFB and meso-tetrakis(4-pyridyl)- porphyrin (TPyP) for which the first and second association constants were estimated to be >108 M-1 and 3.0×107 M-1, respectively. 8PZnPFB originally shows 94 % energy transfer efficiency from PZn to the focal PFB. By the formation of the host-guest complex (8PZnPFB2TPyP) the emission intensity of 8PZnPFB is significantly decreased, and an ultrafast charge separation state is generated. The energy transfer process from PZn wings to the PFB core in 8P ZnPFB is almost entirely switched to an electron transfer process by the formation of 8PZnPFB2TPyP. Multiporphyrin dendrimers exhibit an excellent excitation energy transfer from the zinc porphyrin wings to the focal free-base porphyrin. The energy transfer is switched to an ultrafast electron transfer by the formation of a host-guest complex with tetrapyridyl porphyrin guests (green in picture). Thus, the multiporphyrin dendrimers serve as unique biomimetic models for both light-harvesting complexes LHC1 and LHC2.

Original languageEnglish (US)
Pages (from-to)6925-6928
Number of pages4
JournalAngewandte Chemie - International Edition
Volume53
Issue number27
DOIs
StatePublished - Jul 1 2014

Fingerprint

Dendrimers
Energy Transfer
Porphyrins
Energy transfer
Light
Electrons
Biomimetics
Zinc
Excitation energy
Titration
Association reactions
Molecules
zinc hematoporphyrin

Keywords

  • dendrimers
  • electron transfer
  • energy transfer
  • host-guest systems
  • porphyrin

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis
  • Medicine(all)

Cite this

Jeong, Young Hwan ; Son, Minjung ; Yoon, Hongsik ; Kim, Pyosang ; Lee, Do Hyung ; Kim, Dongho ; Jang, Woo Dong. / Guest-induced photophysical property switching of artificial light-harvesting dendrimers. In: Angewandte Chemie - International Edition. 2014 ; Vol. 53, No. 27. pp. 6925-6928.
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Guest-induced photophysical property switching of artificial light-harvesting dendrimers. / Jeong, Young Hwan; Son, Minjung; Yoon, Hongsik; Kim, Pyosang; Lee, Do Hyung; Kim, Dongho; Jang, Woo Dong.

In: Angewandte Chemie - International Edition, Vol. 53, No. 27, 01.07.2014, p. 6925-6928.

Research output: Contribution to journalArticle

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AU - Jeong, Young Hwan

AU - Son, Minjung

AU - Yoon, Hongsik

AU - Kim, Pyosang

AU - Lee, Do Hyung

AU - Kim, Dongho

AU - Jang, Woo Dong

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