PAMAM 树枝状大分子的紫外及荧光性质研究

摘要

From 0.5 to 5.0 generation PAMAM dendrimers were synthesized with ethylenediamine core by Michael addition reaction and aminolysis reaction two repeated steps. The structure of dendrimers were confirmed by FTIR 1H NMR 13C NMR MS and all of these measurements showed that they were successfully synthesized. Furthermore, The authors studied the UV and fluorescence properties of different generation dendrimers. Because of diffenent terminal groups,it was found that the whole generation and half generation show different ultraviolet absorption peaks and the intensityof ultraviolet absorption is closely related to the molecular skeleton. There is no traditional fluorescence emission groups, but PAMAM dendrimers show the peculiar phenomenon. In this paper we detailedly studied the factors which affect PAMAM dendrimers fluorescence properties.%以乙二胺为核,通过迈克尔加成反应和酯胺解反应这两个重复的步骤,合成了0.5～5.0代PAMAM 树枝状大分子,使用氢核磁共振波谱(1H NMR)、碳核磁共振波谱(13C NMR)和质谱(MS)等证明了树枝状大分子的结构.同时对不同代数树枝状大分子的紫外及荧光性质进行了研究,发现整代树枝状大分子和半代树枝状大分子由于端基的不同,从而表现出不同的紫外吸收峰位,而紫外吸收强度与树枝状分子的分子骨架有密切的关系.虽然没有传统的荧光发射基团,但 PAMAM 树枝状分子却表现出特有的荧光现象,本文对 PAMAM 树枝状分子的荧光性质的影响因素进行了详细的研究.