Spectroscopic properties of chlorophylls and their derivatives. Influence of molecular structure on the electronic state

Yoshimune Nonomura, Shigeo Igarashi, Naoki Yoshioka, Hidenari Inoue

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

The spectroscopic properties of chlorophylls (Mg-Chl a and H2-Chl a), metallochlorophyll a and b (M-Chl a and b, M = Ni, Cu and Zn), zinc(II) pyromethylpheophorbide a (Zn-PMP a) and zinc(II) chlorin e6 trimethyl ester (Zn-Chl e6 TME) were studied by circular dichroism (CD), magnetic circular dichroism (MCD), X-ray photoelectron spectroscopy (XPS) and cyclic voltammetry (CV). The electronic absorption spectra were assigned in terms of the spectral analysis of CD and MCD. The absorption maximum of the Qy band varied linearly with the electronegativity of the central metal M and the energy level of the macrocyclic π orbitals in M-Chl a. The semiempirical MO calculation demonstrated that the deviation of H2-Chl a from the general trend is induced by rising of the energy levels of next HOMO and second next HOMO in H2-Chl a. A comparison of the UV-VIS and MCD spectral data in zinc(II) chlorophylls revealed that the substituents on the pyrrole β position and the ring V govern the position of the Q and B bands. The spectroscopic behavior was explained on the basis of the energy level of the macrocyclic π orbitals calculated by the conventional MO method.

Original languageEnglish
Pages (from-to)155-166
Number of pages12
JournalChemical Physics
Volume220
Issue number1-2
Publication statusPublished - 1997 Jul 15

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Electronic states
chlorophylls
Chlorophyll
Electron energy levels
Molecular structure
dichroism
Zinc
molecular structure
Derivatives
electronics
zinc
energy levels
Electronegativity
Pyrroles
Spectrum analysis
Cyclic voltammetry
Absorption spectra
Esters
X ray photoelectron spectroscopy
orbitals

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Atomic and Molecular Physics, and Optics

Cite this

Spectroscopic properties of chlorophylls and their derivatives. Influence of molecular structure on the electronic state. / Nonomura, Yoshimune; Igarashi, Shigeo; Yoshioka, Naoki; Inoue, Hidenari.

In: Chemical Physics, Vol. 220, No. 1-2, 15.07.1997, p. 155-166.

Research output: Contribution to journalArticle

Nonomura, Yoshimune ; Igarashi, Shigeo ; Yoshioka, Naoki ; Inoue, Hidenari. / Spectroscopic properties of chlorophylls and their derivatives. Influence of molecular structure on the electronic state. In: Chemical Physics. 1997 ; Vol. 220, No. 1-2. pp. 155-166.
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