A triangular iron(III) complex potentially relevant to iron(III)-binding sites in ferreascidin

Eckhard Bill, Carsten Krebs, Manuela Winter, Michael Gerdan, Alfred X. Trautwein, Ulrich Flörke, Hans Jürgen Haupt, Phalguni Chaudhuri

Research output: Contribution to journalArticle

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Abstract

An asymmetric triangular Fe111 complex has been synthesized by an unusual Fe11-promoted activation of salicylaldoxime. Formation of tile ligand 2(bis(salicylideneamino)methyl)phenol in situ is believed to occur through the reductive deoximation of salicylaldoxime by ferrous ions. The trinuclear ferric complex has been characterized on the basis of elemental analysis. IR, variable-temperature magnetic susceptibility, and EPR and Mossbauer spectroscopies. The molecular structure established by X-ray diffraction consists of a trinuclear structure with a [Fe33-O)(μ2-OPh]61 core. Two iron ions are in a distorted octahedral environment having FEN2O4 coordination spheres, and the five-coordinated third iron ion, with an FeNO4 coordination sphere, is in a trigonal bipyramidal environment. The magnetic susceptibility measurements revealed an S1= 5/2 ground state with the antiparallel exchange interactions J = -34.3 cm1 J = 4.7 cm1 and D = - 0.90 cm1. The EPR results are consistent with a ground state of S= 5/2 together with a negative D5/2 value. The Mossbauer isomer shifts together with the quadrupole splitting also provide evidence for the high-spin state of the three ferric sites. Magnetic Mossbauer spectra lead to the conclusion that the internal magnetic fields possibly lie in the plane of the three ferric ions.

Original languageEnglish (US)
Pages (from-to)193-201
Number of pages9
JournalChemistry - A European Journal
Volume3
Issue number2
DOIs
StatePublished - Jan 1 1997

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Binding sites
Iron
Binding Sites
Ions
Magnetic susceptibility
Ground state
Paramagnetic resonance
Exchange interactions
Mossbauer spectroscopy
Tile
Phenol
Isomers
Molecular structure
Phenols
Chemical activation
Ligands
Magnetic fields
X ray diffraction
Pyura stolonifera ferreascidin protein
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Organic Chemistry

Cite this

Bill, Eckhard ; Krebs, Carsten ; Winter, Manuela ; Gerdan, Michael ; Trautwein, Alfred X. ; Flörke, Ulrich ; Haupt, Hans Jürgen ; Chaudhuri, Phalguni. / A triangular iron(III) complex potentially relevant to iron(III)-binding sites in ferreascidin. In: Chemistry - A European Journal. 1997 ; Vol. 3, No. 2. pp. 193-201.
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abstract = "An asymmetric triangular Fe111 complex has been synthesized by an unusual Fe11-promoted activation of salicylaldoxime. Formation of tile ligand 2(bis(salicylideneamino)methyl)phenol in situ is believed to occur through the reductive deoximation of salicylaldoxime by ferrous ions. The trinuclear ferric complex has been characterized on the basis of elemental analysis. IR, variable-temperature magnetic susceptibility, and EPR and Mossbauer spectroscopies. The molecular structure established by X-ray diffraction consists of a trinuclear structure with a [Fe3(μ3-O)(μ2-OPh]61 core. Two iron ions are in a distorted octahedral environment having FEN2O4 coordination spheres, and the five-coordinated third iron ion, with an FeNO4 coordination sphere, is in a trigonal bipyramidal environment. The magnetic susceptibility measurements revealed an S1= 5/2 ground state with the antiparallel exchange interactions J = -34.3 cm1 J = 4.7 cm1 and D = - 0.90 cm1. The EPR results are consistent with a ground state of S= 5/2 together with a negative D5/2 value. The Mossbauer isomer shifts together with the quadrupole splitting also provide evidence for the high-spin state of the three ferric sites. Magnetic Mossbauer spectra lead to the conclusion that the internal magnetic fields possibly lie in the plane of the three ferric ions.",
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Bill, E, Krebs, C, Winter, M, Gerdan, M, Trautwein, AX, Flörke, U, Haupt, HJ & Chaudhuri, P 1997, 'A triangular iron(III) complex potentially relevant to iron(III)-binding sites in ferreascidin', Chemistry - A European Journal, vol. 3, no. 2, pp. 193-201. https://doi.org/10.1002/chem.19970030205

A triangular iron(III) complex potentially relevant to iron(III)-binding sites in ferreascidin. / Bill, Eckhard; Krebs, Carsten; Winter, Manuela; Gerdan, Michael; Trautwein, Alfred X.; Flörke, Ulrich; Haupt, Hans Jürgen; Chaudhuri, Phalguni.

In: Chemistry - A European Journal, Vol. 3, No. 2, 01.01.1997, p. 193-201.

Research output: Contribution to journalArticle

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T1 - A triangular iron(III) complex potentially relevant to iron(III)-binding sites in ferreascidin

AU - Bill, Eckhard

AU - Krebs, Carsten

AU - Winter, Manuela

AU - Gerdan, Michael

AU - Trautwein, Alfred X.

AU - Flörke, Ulrich

AU - Haupt, Hans Jürgen

AU - Chaudhuri, Phalguni

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AB - An asymmetric triangular Fe111 complex has been synthesized by an unusual Fe11-promoted activation of salicylaldoxime. Formation of tile ligand 2(bis(salicylideneamino)methyl)phenol in situ is believed to occur through the reductive deoximation of salicylaldoxime by ferrous ions. The trinuclear ferric complex has been characterized on the basis of elemental analysis. IR, variable-temperature magnetic susceptibility, and EPR and Mossbauer spectroscopies. The molecular structure established by X-ray diffraction consists of a trinuclear structure with a [Fe3(μ3-O)(μ2-OPh]61 core. Two iron ions are in a distorted octahedral environment having FEN2O4 coordination spheres, and the five-coordinated third iron ion, with an FeNO4 coordination sphere, is in a trigonal bipyramidal environment. The magnetic susceptibility measurements revealed an S1= 5/2 ground state with the antiparallel exchange interactions J = -34.3 cm1 J = 4.7 cm1 and D = - 0.90 cm1. The EPR results are consistent with a ground state of S= 5/2 together with a negative D5/2 value. The Mossbauer isomer shifts together with the quadrupole splitting also provide evidence for the high-spin state of the three ferric sites. Magnetic Mossbauer spectra lead to the conclusion that the internal magnetic fields possibly lie in the plane of the three ferric ions.

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