Resonance Raman and infrared studies on axial coordination to chlorophylls a and b in vitro

Journal Article · Thu Jan 16 04:00:00 EST 1986 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100274a009· OSTI ID:5890144

Fujiwara, M; Tasumi, M

The resonance Raman and infrared spectra of chlorophyll a were observed in various solvents. The Raman spectra in the 1620-1510-cm/sup -1/ region were classified into two groups, depending on the solvent used. Three Raman bands at 1612-1606 (weak), 1554-1551 (strong), and 1529-1527 (medium) cm/sup -1/ (group I) observed in n-hexane, CCl/sub 4/, CS/sub 2/, diethyl ether, acetone, ethyl acetate, and ethanol solutions shift, respectively, to 1599-1596, 1548-1545, and 1521-1518 cm/sup -1/ (group II) in tetrahydrofuran, dioxane, pyridine, and methanol solutions. In the solutions giving rise to the spectrum of group I the Mg atom of chlorophyll a is mostly five-coordinated (with one axial ligand), whereas the six-coordinated species (with two axial ligands) is the major fraction in the solutions giving rise to the spectrum of group II. The Raman and infrared spectra of chlorophyll b show that chlorophyll b behaves in the same manner as chlorophyll a with respect to the axial coordination by solvent molecules. 22 references, 7 figures.

• Research Organization: Univ. of Tokyo, Japan
• OSTI ID: 5890144
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 90:2; ISSN JPCHA
• Country of Publication: United States
• Language: English

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