Synthese und Eigenschaften von Eisen(II)-Komplexen mit vier- und fünfzähnigen N,S-Chelatliganden. Kristallstruktur von [Fe(GBMA)py] · py (GBMA2− = Glyoxal-bis-(2-mercaptoanil)) |
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Authors: | P Karsten C Maichle-Mssmer J Strhle |
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Institution: | P. Karsten,C. Maichle-Mössmer,J. Strähle |
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Abstract: | Synthesis and Properties of Iron(II) Complexes with tetra- and pentadentate N,S-Chelate Ligands. Crystal Structure of Fe(GBMA)py] · py (GBMA2? = Glyoxal bis-(2-mercaptoanil)) The complexes glyoxal-bis-(2-mercaptoanil)iron(II) Fe(GBMA)], diacetyl-bis-(2-mercaptoanil)iron(II), Fe(DBMA)] and o-phthalaldehyde-bis-(2-mercaptoanil)iron(II) Fe(PhBMA)] have been synthesized by reaction of the corresponding protonated ligands with anhydrous iron(II)-acetate. Pyridine-2,6-dialdehyde-bis-(2-mercaptoanil)iron(II), Fe(PyBMA)] was obtained by a template synthesis with pyridine-2,6-dialdehyde, 2-aminothiophenol and iron(II)-acetate. Recrystallizing the complexes Fe(GBMA)] and Fe(DBMA)] from pyridine afforded Fe(GBMA)py] · py and Fe(DBMA)py] · py. For all complexes the magnetic properties have been determined, and the Mössbauer spectra were recorded at 82 K. Compounds Fe(GBMA)] and Fe(DBMA)] show quasi reversible redox properties in the cyclovoltammogram, while for Fe(PhBMA)] an irreversible oxidation was observed. Fe(GBMA)py] · py crystallizes in the monoclinic space group P21 with a = 1288.7(1), b = 1242.63(5), c = 1396.0(1) pm, β = 98.24(1)°, and Z = 4. In the neutral complex the Fe atom has a square pyramidal coordination with the pyridine nitrogen atom in apical position. The basal plane is formed by two nitrogen and two sulfur atoms of the ligand GBMA2?. The iron is located 40 pm above the pyramidal base. Its average distances to the donor atoms of the GBMA ligand are Fe? N = 190 pm, and Fe? S = 222 pm, while the distance to the nitrogen atom of the coordinated pyridine molecule is 207 pm. |
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Keywords: | Iron(II) complexes Schiff's base ligands crystal structure magnetic properties Mö ssbauer spectra electrochemistry |
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