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.
得到Fe(II)和Fe(III)离子与
芦丁的固体络合物。根据元素分析和热重研究,确定了化合物的组成如下:(1)FeOH(C27H29O16)·5H2O,(2)Fe2OH(C27H27O16)·9H2O,(3)Fe(OH)2(C27H29O16) )·8H2O,(4)[Fe6(OH)2(4H2O)(C15H7O12)SO4]·10H2O。
芦丁分子中的配位位点是根据光谱数据(紫外-可见光和红外)建立的。在(1)和(3)的情况下,推测
芦丁通过4C=O和5C-氧与
铁离子结合。在(2)的情况下,
配体的5C-OH和4C=O基团以及3′C-OH和4′C-OH参与结合
金属离子。在(4)的合成条件下,当
铁(III)离子相对于
芦丁过量时,会发生
配体氧化的副反应。在该化合物中,
配体的作用是
芦丁氧化后产生的醌,Fe(II) 和 Fe(III) 离子的取代发生在 4C=O, 5C–OH 以及 4'C–OH, 3 'C–OH
配体基团。磁性测量表明(1)和(3)是高自旋配合物。