Formation and stabilization of five-coordinate iron(II) verdoheme analogues by axial weakly coordinating anion ligation. X-ray crystal structures of [(OEOPFe)2O](X)2 (X = AsF6, SbF6) |
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Authors: | Mozhgan Khorasani-Motlagh Nasser Safari Hashem Shahroosvand Brian O Patrick |
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Institution: | a Chemistry Department, University of Sistan & Baluchestan, P.O. Box 98155-147, Zahedan, Iran b Chemistry Department, University of Shahid Beheshti, Tehran, Iran c Chemistry Department, University of British Columbia, Vancouver, Canada |
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Abstract: | The effect of weakly coordinating anions, , as axial ligands on the formation and coordination chemistry of verdoheme analogues have been examined. Two new five-coordinate and stable iron(II) verdoheme analogues, OEOPFeIIX], where OEOP is the monoanion of octaethyloxoporphyrin and X = AsF6 and SbF6, have been isolated. The compounds have been characterized by different spectroscopic methods as well as elemental analysis. 1H NMR spectroscopy and magnetic moment measurements show that the OEOPFeIIX] are paramagnetic and iron is five-coordinate. Exposure of dichloromethane solutions of OEOPFeIIX] (X = AsF6 (2), SbF6 (3)) to dioxygen result in their transformation into the μ-oxo bridged compounds, (OEOPFe)2O](X)2 (X = AsF6 (4), SbF6 (5)). The structures of 4 and 5 have been determined by X-ray diffraction analysis, both are structurally similar with a P21/c space group in the monoclinic crystal system. |
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Keywords: | Verdoheme Weakly coordinating anion Octaethyloxoporphyrin AsF6 SbF6 |
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