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Zeitschrift für Naturforschung B

A Journal of Chemical Sciences

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1865-7117
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Volume 50, Issue 8 (Aug 1995)

Issues

Axial Coordination of Phosphine or Phosphite to Iron(III) Chlorophyll a

Hidenari Inoue
  • Department of Applied Chemistry, Keio University. 3-14-1 Hiyoshi. Kohoku-ku, Yokohama 223 (Japan)
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/ Hiromi Akahori
  • Department of Applied Chemistry, Keio University. 3-14-1 Hiyoshi. Kohoku-ku, Yokohama 223 (Japan)
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/ Yuri Ohno
  • Department of Applied Chemistry, Keio University. 3-14-1 Hiyoshi. Kohoku-ku, Yokohama 223 (Japan)
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/ Katsuo Nakazawa
  • Department of Applied Chemistry, Keio University. 3-14-1 Hiyoshi. Kohoku-ku, Yokohama 223 (Japan)
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/ Yoshimune Nonomura
  • Department of Applied Chemistry, Keio University. 3-14-1 Hiyoshi. Kohoku-ku, Yokohama 223 (Japan)
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/ Naoki Yoshioka
  • Department of Applied Chemistry, Keio University. 3-14-1 Hiyoshi. Kohoku-ku, Yokohama 223 (Japan)
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/ Gernot Heckmann
  • Institut für Anorganische Chemie der Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart (Germany)
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/ Ekkehard Fluck
  • Gmelin-Institut für Anorganische Chemie der Max-Planck-Gesellschaft, Varrentrappstraße 40/42, D-60486 Frankfurt am Main (Germany)
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Published Online: 2014-06-02 | DOI: https://doi.org/10.1515/znb-1995-0817

The adduct formation of iron(III) chlorophyll a with phosphines or phosphites has been studied by spectroscopic methods. The red-shift in the Soret and Q bands caused by the axial coordination of phosphine or phosphite to iron(III) chlorophyll a is an evidence for the autoreduction of the central iron(III) ion. The 31P{1H} NMR spectrum of bis-adducts measured in the presence of excess phosphine or phosphite ligands gave a single peak in the down field range compared to that of the corresponding free ligand. The ESR and X-ray photoelectron spectra have revealed that the central iron atom of the bis-adduct of iron chlorophyll a with phosphines or phosphites is divalent and in the low-spin state. The axial coordination of phosphine or phosphite influences the electronic configuration of the central iron atom and the macrocyclic chlorine ligand to induce the autoreduction of the central iron(III) ion.

: Iron(III) Chlorophyll a; (Phosphine)iron(III) Chlorophyll a; (Phosphite)iron(III) Chlorophyll a; X-Ray Photoelectron Spectra; NMR Spectra

About the article

Received: 1995-02-21

Published Online: 2014-06-02

Published in Print: 1995-08-01


Citation Information: Zeitschrift für Naturforschung B, ISSN (Online) 1865-7117, ISSN (Print) 0932-0776, DOI: https://doi.org/10.1515/znb-1995-0817.

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[1]
Yoshimune Nonomura, Shigeo Igarashi, Naoki Yoshioka, and Hidenari Inoue
Chemical Physics, 1997, Volume 220, Number 1-2, Page 155

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