Covalently linked zinc chlorophyll dimers as a model of a chlorophyllous pair in photosynthetic reaction centers

Hitoshi Tamiaki, Kazuhiro Fukai, Hideki Shimazu, Katsunori Nishide, Yutaka Shibata, Shigeru Itoh, Michio Kunieda

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17 Citations (Scopus)

Abstract

A heterodimer, where zinc pyropheophorbide-a was linked with zinc pyropheophorbide-d through ethylene glycol diester, was prepared, as well as the corresponding homodimers. The synthetic dimers were complexed with methanol in benzene to give folded dimers by mutual Zn⋯O(Me)-H⋯O=C13 1 bonding. Such complexes had furthest red (Qy) absorption bands at longer wavelengths than the monomeric species. These red-shifts were ascribable to excitonic coupling of the Qy transition states in the chlorin π-π stacking conformer. In the heterodimeric system, a minor band was observed at the shorter wavelength side of the main Qy band. This observation can be explained by an additional contribution of Qy vibronic state to the exciton-coupled states. Based on the experimental results, a pair of chlorophyll(Chl)-d with Chl-a as well as a Chl-d homopair were proposed as dimers in reaction centers of Chl-d dominating cyanobacteria.

Original languageEnglish
Pages (from-to)1231-1237
Number of pages7
JournalPhotochemical and Photobiological Sciences
Volume7
Issue number10
DOIs
Publication statusPublished - 2008
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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