聚酰胺胺树状大分子与Co^(2+)的相互作用

Interaction Between Polyamidoamine Dendrimers and Co^(2+)

采用发散法合成了G3.5和G4.0的聚酰胺胺(PAMAM)树状大分子,研究了树状大分子的代数、树状大分子与Co2+的摩尔比、溶液pH值、反应时间和温度对树状大分子与Co2+相互作用的影响.结果表明:当存在G4.0的聚酰胺胺树状大分子时,配合物水溶液的最大吸收波长出现在356 nm处;当存在G3.5的聚酰胺胺树状大分子时,混合物水溶液在可见光区域几乎没有吸收;当聚酰胺胺树状大分子和Co2+的摩尔比由1∶10变为1∶30时,配合物水溶液在356 nm处的吸光度增加;随反应时间延长,配合物水溶液的吸光度增加;溶液pH值和反应温度对聚酰胺胺树状大分子与Co2+的相互作用也有很大影响.

Polyamidoamine （PAMAM） dendrimers of G3.5 and G4.0 were synthesized by means of the divergent method. The effects of the dendrimer generation, the molar ratio of dendrimer to Co^2＋ , the pH value of the solution, the reaction time and the temperature on the interaction between polyamidoamine dendrimers and Co^2＋ were then investigated. The results indicate that （1） the maximum absorption wavelength of PAMAM G4.0/Co^2＋ solution appears at 356 nm, while the PAMAM G3.5/Co^2＋ solution seldom shows light absorption in visible spectrum, （2） the absorbency of PAMAM G4.0/Co^2＋ solution at 356 nm increases when the molar ratio of PAMAM G4.0 to Co^2＋ changes from 1：10 to 1： 30, and the same phenomenon can be observed when increasing the reaction time, and （3） both the pH value of the solution and the reaction temperature greatly influence the interaction between polyamidoamine dendrimers and Co^2＋.