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Aggregation of synthetic metallochlorins in hexane. A model of chlorosomal bacteriochlorophyll self-assemblies in green bacteria

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Abstract

Metal 31-hydroxy-131-oxo-chlorins were systematically prepared and their visible and circular dichroism spectra were measured in a solution. All the synthetic complexes were monomeric in tetrahydrofuran. The Ni/Cu/Pd/Ag(II) complexes were still monomeric after dilution with 99-fold hexane. In contrast, the Co(II) complex, as well as the Mg/Zn/Cd(II) complexes, self-aggregated in 1% (v/v) tetrahydrofuran-hexane to form oligomers. In the less polar organic solvent, the Mn(III) complex fully dimerized and the Fe(III) complex partially dimerized. Infrared spectra of the synthetic metal chlorins in solid thin films revealed that the Ni/Cu/Pd/Ag(II) and ClFe(III) chlorins were 4- and 5-coordinated monomers, respectively, the AcOMn(III) chlorin formed a 6-coordinated dimer by mutual coordination of 31-OηηηMn, and the Co(II) chlorin as well as the Mg/Zn/Cd(II) chlorins self-aggregated by 13-C=OηηηO-Hηηηmetal to form large oligomers.

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Authors and Affiliations

  1. Department of Bioscience and Biotechnology, Faculty of Science and Engineering, Ritsumeikan University, Kusatsu, Shiga, 525-8577, Japan

    Hitoshi Tamiaki & Masaaki Amakawa

  2. Max-Planck-Institut für Strahlenchemie, Postfach, 101365, D-45413, Mülheim an der Ruhr, Germany

    Alfred R. Holzwarth & Kurt Schaffner

Authors
  1. Hitoshi Tamiaki
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  2. Masaaki Amakawa
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  3. Alfred R. Holzwarth
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  4. Kurt Schaffner
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Correspondence to Hitoshi Tamiaki.

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Tamiaki, H., Amakawa, M., Holzwarth, A.R. et al. Aggregation of synthetic metallochlorins in hexane. A model of chlorosomal bacteriochlorophyll self-assemblies in green bacteria. Photosynthesis Research 71, 59–67 (2002). https://doi.org/10.1023/A:1014951513848

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