Solid complexes of iron(II) and iron(III) with rutin |
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Authors: | Dorota Nowak Anna Kuźniar Maria Kopacz |
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Institution: | 1.Department of Inorganic and Analytical Chemistry, Chemical Faculty,Rzeszow University of Technology,Rzeszów,Poland |
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Abstract: | Solid complex compounds of Fe(II) and Fe(III) ions with rutin were obtained. On the basis of the elementary analysis and thermogravimetric
investigation, the following composition of the compounds was determined: (1) FeOH(C27H29O16)·5H2O, (2) Fe2OH(C27H27O16)·9H2O, (3) Fe(OH)2(C27H29O16)·8H2O, (4) Fe6(OH)2(4H2O)(C15H7O12)SO4]·10H2O. The coordination site in a rutin molecule was established on the basis of spectroscopic data (UV–Vis and IR). It was supposed
that rutin was bound to the iron ions via 4C=O and 5C—oxygen in the case of (1) and (3). Groups 5C–OH and 4C=O as well as 3′C–OH and 4′C–OH of the ligand participate in binding metals ions in the case of (2). At an excess of iron(III) ions with regard to rutin under the synthesis conditions of (4), a side reaction of ligand oxidation occurs. In this compound, the ligands’ role plays a quinone which arose after rutin
oxidation and the substitution of Fe(II) and Fe(III) ions takes place in 4C=O, 5C–OH as well as 4′C–OH, 3′C–OH ligands groups.
The magnetic measurements indicated that (1) and (3) are high-spin complexes. |
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