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How the formation process influences the structure of BChl c aggregates

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Abstract

The change of absorption spectra has been measured during the drying process of (31 R)bacteriochlorophyll (BChl) c from diethyl ether, dichloromethane (CH2Cl2) and carbon tetrachloride (CCl4) solutions. Absorption maxima of the Qy(0–0) transition of BChl c appear at 659 nm in diethyl ether, 680 nm in CH2Cl2 and 710 nm in CCl4. All these peaks are red-shifted to about 740 nm with formation of solid high aggregates when the solutions are completely dried. Fourier transform infrared spectra of the three solid aggregates are almost identical. However, magnetic circular dichroism and circular dichroism spectra are different and can be explained in terms of variations in stacking size of the aggregates and molecular arrangement of BChl c. Small-angle X-ray diffraction has been observed only for the aggregates treated with CH2Cl2, and the same sample gave rise to highly resolved cross polarization/magic angle spinning 13C nuclear magnetic resonance spectrum. The results suggest that molecular ordering of the solid-state BChl c aggregates is highly dependent on the formation process which is largely determined by the solvent used.

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Authors and Affiliations

  1. Department of Biomolecular Engineering, Graduate School of Engineering, and Center for Interdisciplinary Science, Tohoku University, Aobayama 07, Aoba-ku, Sendai, 980-8579, Japan

    Mitsuo Umetsu, Zheng-Yu Wang, Jun Zhang, Masayuki Kobayashi & Tsunenori Nozawa

  2. Research Institute for Advanced Science and Technology, Osaka Prefecture University, Gakuencho, Sakai, 593-8570, Japan

    Takasada Ishii & Kaku Uehara

  3. Faculty of Engineering Science, Osaka University, Toyonaka, 560-0043, Japan

    Yoji Inoko

Authors
  1. Mitsuo Umetsu
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  2. Zheng-Yu Wang
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  3. Jun Zhang
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  4. Takasada Ishii
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  5. Kaku Uehara
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  6. Yoji Inoko
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  7. Masayuki Kobayashi
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  8. Tsunenori Nozawa
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Umetsu, M., Wang, ZY., Zhang, J. et al. How the formation process influences the structure of BChl c aggregates. Photosynthesis Research 60, 229–239 (1999). https://doi.org/10.1023/A:1006258029191

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