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以水杨酸、8-羟基喹啉为配体与铁(Ⅲ)合成了三元配合物,用元素分析、红外光谱、紫外可见光谱、荧光光谱对其进行表征,确定其化学组成为[Fe(C7H5O3)(C9H6NO)2]。其中,水杨酸脱质子以羧酸根与Fe3+成键,酚羟基不参与配位,而8-羟基喹啉脱质子以酚羟基氧和杂环上的氮原子双齿配位,形成五元螯环。配合物在整个可见光区都有较强吸收,粉末及其浓溶液均呈黑色,稀溶液呈紫色。以300 nm为激发波长时,三元配合物在409 nm处有较强的发射荧光。采用分光光度法研究其对大肠杆菌生长的作用,配合物浓度低于2 mmol/L时,促进大肠杆菌的生长,高于2 mmol/L时抑制其生长,浓度越大抑制作用越强,即配合物对大肠杆菌的生长具有双向生物效应。
Ternary complexes with iron (Ⅲ) were synthesized by salicylic acid and 8-hydroxyquinoline ligands. Their chemical compositions were characterized by elemental analysis, IR, UV-Vis and fluorescence spectra. (C7H5O3) (C9H6NO) 2]. Among them, salicylic acid deprotonated with carboxylate and Fe3 + bond, phenolic hydroxyl does not participate in coordination, and 8-hydroxyquinoline deproton to phenolic hydroxyl oxygen and heterocyclic nitrogen atom bidentate coordination, the formation of five yuan chelate ring. The complex has strong absorption in the visible region, the powder and its concentrated solution are all black, and the dilute solution is purple. At 300 nm excitation wavelength, the ternary complex has strong emission fluorescence at 409 nm. The growth of Escherichia coli was studied spectrophotometrically. When the concentration of the complex was less than 2 mmol / L, the growth of Escherichia coli was promoted. When the concentration was higher than 2 mmol / L, the growth was inhibited. The stronger the inhibition was, The complex has a bi-directional biological effect on the growth of E.coli.