【摘要】 以乙醇作溶剂合成了Al（Ⅲ）-木犀草素和黄芩素配合物,并使用紫外可见光谱、红外光谱及质谱对配合物进行了表征。摩尔比法及质谱数据确定了木犀草素和黄芩素与Al（Ⅲ）形成配比为2∶1的配合物。通过对光谱数据进行分析,推断出Al（Ⅲ）与木犀草素配位点为4-羰基-5-羟基以及3’,4’-邻羟基,而与黄芩素配位点为4-羰基-5-羟基以及6,7-邻羟基。具体配位构型为一个Al（Ⅲ）金属原子为中心,以4个配位键与2分子黄酮形成1个五员环和1个六员环的配位结构。研究了木犀草素和黄芩素及其配合物对羟自由基（·OH）、超氧阴离子自由基（O₂^-·）及DPPH自由基的清除率,并对比配体与配合物的抗氧化能力的强弱,结果表明配合物较配体有更高效的抗氧化能力。更多还原

【Abstract】 Al( Ⅲ) complexes with flavonoids luteolin and baicalein in ethanol were synthesized and characterized using ultraviolet-visible spectrometry,infrared spectrometry and mass spectrometry. The molar ratio method and mass spectrometry were applied to ascertain the stoichiometry ratio of the flavonoid-metal complexes. Both of the methods indicated a 1 ∶ 2( metal / ligand) composition for the two complexes. Spectroscopic data suggested that coordination reaction occurred in the 4- carbonyl- 5- hydroxyl groups and the 3’,4’-dihydroxyl groups for luteolin-Al( Ⅲ) complex,and 4- carbonyl- 5- hydroxyl groups and 6,7- dihydroxy groups for baicalein- Al( Ⅲ) complex,respectively. Specifically,as the center,Al( Ⅲ) coordinated two molecules of flavonoid to form one five-membered ring and one six-membered ring using tetra-coordinate complex. Antioxidant abilities of the free ligands and complexes were also investigated under an electrochemical point of view. Both the ligands and complexes has scavenging effects on DPPH,hydroxyl and superoxide radicals. Overall,the avonoid-metal complexes are more effective antioxidants than the free avonoids.更多还原