A Novel Vanadyl Alkylporphyrins from Geological Samples: A Possible Derivative of Divinylchlorophylls or Bacteriochlorophyll <i>a</i>?

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  • Yuichiro Kashiyama
    Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology
  • Motoo Shiro
    X-ray Research Laboratory, Rigaku Co
  • Ryuji Tada
    Department of Earth and Planetary Science, The University of Tokyo
  • Naohiko Ohkouchi
    Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology

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<jats:title>Abstract</jats:title> <jats:p>A novel C30 vanadyl alkylporphyrins, 13,15-ethano-3-ethyl-2,7,12,18-tetramethylporphyrin (i.e., 8-nor-deoxophylloerythroetioporphyrin; 8-nor-DPEP) has been isolated from a Middle Miocene siliceous shale. The structure of intact vanadyl porphyrins was determined by X-ray crystallography. The structure suggests it to be originated from specific chloropigments such as chlorophylls a2, b2, c2, and c3 or bacteriochlorophyll a, hence potentially being a biomarker of specific photoautotrophs.</jats:p>

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  • Chemistry Letters

    Chemistry Letters 36 (6), 706-707, 2007-04-28

    Oxford University Press (OUP)

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