8-羟基喹啉存在下水相(两相)中合成取代水杨酸二茂钛配合物

在8-羟基喹啉存在下,分别采用水相法和两相法简便合成了5种取代水杨酸二茂钛配合物,并用元素分析、IR及 1H NMR等手段对配合物进行了结构表征,发现配合物中均不含8-羟基喹啉配体,而是形成以取代水杨酸为双齿配体的六元杂环化合物.用电子吸收光谱分别对两相反应体系(H2O/CHCl3)的水相和有机相进行了动态监测,发现8-羟基喹啉首先通过两相界面与有机相中的二氯二茂钛形成水溶性的过渡性配合物,然后该过渡性配合物再与有机相中的取代水杨酸作用形成了目标配合物.

Synthesis of Titanocene Substituted Salicylato Complexes in Aqueous or H2O/CHCl3 Medium in the Presence of 8-Hydroxyquinoline

In the presence of 8-hydroxyquinoline, five titanocene substituted salicylato complexes were prepared in aqueous or H 2O/CHCl 3 medium, respectively. The complexes were characterized by elemental analysis, IR and 1H NMR spectra. The results show that substituted salicylic acid acts as a bidentate ligand and coordinates with Ti to form a cyclic compound. In addition, the structure of the complexes does not contain 8-hydroxyquinoline ligand. Based on the UV-vis spectrum, the mechanism of the reaction was proposed: 8-hydroxyquinoline in the aqueous phase and Cp 2TiCl 2 in the organic phase form an aqueous-complex-8-hydroxyquinoline titanocene complex interfacially, then, the aqueous-complex undergoes a ligand exchange with substituted salicylic acid to form the final complexes.