水相法合成水杨酸类二茂钛衍生物与取代基效应及酸度影响的研 究

用二氯二茂钛-乙酰丙酮的水溶液与取代水杨酸钠在不同pH条件下合成了两种类型的配合物。所有配合物经元素分析、IR和^1HNMR进行了结构表征,并通过Hammett方程,描述了取代基效应与二茂钛水杨酸类配合物的合成和性质之间的联系。结果表明:Hammettσ值对反应有较大影响,取代基的σ值越大,越有利于合成产物由A型向B型配合物过渡;产物的颜色、分解温度、IR及^1HNMR亦与取代基有一定关系。

Preparation of titanocene of substituted salicylic complexes in aqueous medium and substituent effects and influences of acidity

Two types of complexes were prepared at different pH's by the reaction of bicyclopentadienyl dichlorotitanium-acetylacetone complex with sodium of substituted salicylic acid in aqueous medium. All of complexes were characterized by elementary, IR and ^1H NMR analysis. The relationship between substituent and synthesis of titanocene of substituted salicylic complexes, and their property could be explained by Hammett equation. The results show that Hammett σ value has a great influence on the reaction. The larger the σ value of substituent, the easier the product transforms from A form into B form. And the colour, decomposition temperature, IR and ^1H NMR of the products have a certain relation to their substituent.