NDLI: Intramolecular excitation energy transfer in diarylurea-linked zinc porphyrin

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Intramolecular excitation energy transfer in diarylurea-linked zinc porphyrin–anthracene dyads

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Photochemical & Photobiological Sciences Vol - 4 Issue - 7

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Photochemical & Photobiological Sciences Vol -2

Intramolecular excitation energy transfer in diarylurea-linked zinc porphyrin–anthracene dyads

Content Provider	Royal Society of Chemistry (RSC)
Author	Ezoe, Masayuki Nakazumi, Hiroyuki Matsuyama, Tetsuya Yagi, Shigeyuki Minami, Toru Horinaka, Hiromichi Ogawa, Yutaro Wada, Kenji
Copyright Year	2005
Abstract	Structurally controlled zinc porphyrin–anthracene dyads, syn-arranged 1 and anti-arranged 2, were newly synthesized employing a diarylurea linkage, and the excitation energy transfer (EET) from the anthracene to the zinc porphyrin chromophore was investigated by steady-state fluorescence emission spectroscopy as well as fluorescence lifetime measurement, especially focusing on the effect of the chromophoric orientation on the EET. In both of the dyads, intramolecular EET was facilitated upon excitation of the anthracene chromophore (λex = 401 nm), and the zinc porphyrin S1–S0 emission (580–720 nm) was enhanced. The EET in the syn-arranged dyad 1 was more efficient than in the anti-arranged 2: the S1–S0 emission in 1 was 1.8 times larger than that in the zinc porphyrin reference compound 3, whereas that in 2 was enhanced by 1.6 times, compared to that in 3. In the fluorescence lifetime measurement, the quiet short-lived component assignable to the EET was observed for the dyads 1 and 2 beyond the analysis limit (<25 ps). The EET rate constants in the dyads 1 and 2 were estimated as not less than 4.0 × 1010 s−1. However, in the case of 2, the residual long-lived component assigned to the anthracene emission was also observed at 425 nm. These results showed that the syn-arrangement of the zinc porphyrin and anthracene chromophores was more preferred for intramolecular EET to the anti-arrangement.
Starting Page	641
Ending Page	646
Page Count	6
File Format	HTM / HTML PDF
ISSN	1474905X
Volume Number	4
Issue Number	8
Journal	Photochemical & Photobiological Sciences
DOI	10.1039/b506335c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Spectroscopy Anthracene EET Porphyrin Fluorescence Eastern European Time Zinc Chromophore
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry

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