Molecular structures and optical properties of aggregated forms of chlorophylls analyzed by means of magnetic circular dichroism

Masayuki Kobayashi, Zheng Yu Wang, Kenji Yoza, Mitsuo Umetsu, Hideo Konami, Mamuro Mimuro, Tsunenori Nozawa

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Molecular structures and optical properties of aggregated forms of chlorophylls analyzed by means of magnetic circular dichroism. Magnetic circular dichroism (MCD) spectra were measured on chlorophylls in different aggregation states formed in organic solvents and in pigment-protein complexes. An index which reflects the magnetic dipole contribution of a specific transition is introduced, that is, a ratio of MCD intensity of Faraday B-term (B) to that of dipole strength (D) (B/D). The absolute value of the index is higher in monomeric chlorophyll a and that in monomeric bacteriochlorophyll a. This index changed depending on the aggregation state of bacteriochlorophyll; in the case of the dimer of bacteriochlorophyll a and bacteriochlorophyll d, the value was nearly the half of that of respective monomer, and it decreases further for a higher aggregate of bacteriochlorophyll d. Based on this index, a molecular structure of the primary electron donor in reaction center complexes is discussed.

Original languageEnglish
Pages (from-to)585-598
Number of pages14
JournalSpectrochimica Acta - Part A Molecular Spectroscopy
Volume52
Issue number5 PART 3
DOIs
Publication statusPublished - 1996 May

Keywords

  • Bacteriochlorophyll
  • Chlorophyll
  • Magnetic circular dichroism
  • Photosynthesis

ASJC Scopus subject areas

  • Engineering(all)

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