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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
Published on: February 15, 2016
[3:1] site-differentiated [4Fe-4S] clusters having one carboxylate and three thiolates
Tamaki Terada1, Kiyohisa Hirabayashi, Dong Liu
1Department of Chemistry, Graduate School of Science, ‡Institute of Transformative Bio-Molecules (WPI-ITbM), and §Research Center for Materials Science, Nagoya University , Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan.
Abstract:
[4Fe-4S] clusters modeled after those in organisms having three cysteine thiolates and one carboxylate were synthesized by using the tridentate thiolato chelate. X-ray structural analysis reveals that the carboxylates coordinate to the unique irons in an η(1) manner rather than η(2). Redox potentials show a positive shift from that of the cluster having ethanethiolate and the tridentate thiolato chelate. These properties conform to the arrangement of the [4Fe-4S] clusters in the electron transfer systems included in Rc dark operative protochlorophyllide oxidoreductase (DPOR) and formaldehyde oxidoreductase (FOR) with Pf ferredoxin.
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