分光光度滴定法测某些多齿配体与Ni(Ⅱ)配合物的稳定常数

摘要

制备了多齿大环配体1,4,7,10-四氮杂环十二烷(L1);1,4,8,11-四(2-羟乙基)-1,4,8,11-四氮杂环十四烷(L2)和无环多齿配体;3-(2-氨基环己氨基)-2-(2-氨基环己氨基甲基)丙酸(L3),4,7,10-十三烷二腈三氢氯化物(L4),2,2'-(1,2-二乙基-双((甲基二氮杂烷基)二乙醇(L5) and 1,1'-(1,2-二乙基-双((2-氨基乙基)二氮杂烷基))-2-二丙醇(L6),并用FTIR,NMR和MS进行了表征,用配有二极管阵列检测器、蠕动泵和pH计的UV-VIS光度仪,经分光光度滴定法测定了它们与Ni(Ⅱ)的配合物的稳定常数.将稳定常数的数据与配体的开链和环状结构特性进行了关联讨论.还讨论了侧基对配合物稳定常数的影响.%The polydentate macrocyclic ligands,1,4,7,10-tetraazacyclododecane (L1),1,4,8,11-tetra(2-hydroxyethyl)-1,4,8,11-tetraazacyclotetradecane (L2); and acyclicpolydentate ligands; 3-(2-aminocyclohexylamino)-2-(2-aminocyclohexylaminomethyl) propionic acid (L3),4,7,10-triazatridecane dinitrile trihydrochloride (L4),2,2'-(1,2-diyl)bis(methylazanediyl)diethanol (Ls) and 1,1'-(ethane-1,2-diylbis((2-aminoethyl) azanediyl)) dipropan -2-ol,(L6)were prepared and their structures were investigated by FTIR,NMR and MS.The stability constants of the nickel (Ⅱ) complexes with these ligands were determined by spectrophotometric titration using a diode array UV-VIS spectrophotometer equipped with peristaltic pump and pH meter.The values of the stability constants are discussed in terms of the open chain or cyclic nature of the ligands.The effect of pendant group on the stability of the complexes is discussed.