Synthesis of New Cu(II)-Chelating Ligand Amphiphiles and Their Esterolytic Properties in Cationic Micelles
作者:Santanu Bhattacharya、Karnam Snehalatha、V. Praveen Kumar
DOI:10.1021/jo026323q
日期:2003.4.1
metal ion binding subunit in the form of a 2,6-disubstituted-4-N,N'-dimethylamine pyridine moiety. Cu(2+)-complexes of these ligands incorporated in cetyltrimethylammonium bromide (CTABr) micelles speeded the cleavage of p-nitrophenyldiphenyl phosphate and p-nitrophenyl hexanoate at pH 7.6. On the basis of a kinetic version of Job plot analysis, a 1:1 ligand/Cu(2+) stoichiometry was found to be the
合成了四个新的四齿2,6-二取代吡啶和三齿2-取代吡啶配体。这些化合物中的两个具有以2,6-二取代的-4-N,N′-二甲基胺吡啶部分形式的金属离子结合亚基。这些配体的十六烷基三甲基溴化铵(CTABr)胶束的Cu(2+)络合物加快了对硝基苯基二苯基磷酸酯和对硝基苯基己酸在pH 7.6的裂解。基于工作图分析的动力学版本,发现1:1配体/ Cu(2+)的化学计量是最活跃的物种。在CTABr胶束中,这些配体中Cu(2+)配位的羟基或-CH(2)OH侧基的pK(a)值在7.8和7.9之间。在存在过量底物的情况下,金属硅化物系统显示出催化(周转)行为。