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合成了1~3代外围修饰萘的聚酰胺-胺(PAMAM)树枝形聚合物Gn-NA,化合物通过了1H NMR,13C NMR,MALDI-TOF MS,IR的鉴定.稳态和时间分辨光物理研究表明,水溶液(含DMSO 0.3%~0.5%,V/V)中Gn-NA分子内相邻萘基团形成激基缔合物,猝灭了萘单体的荧光发射,随代数增加,对萘单体荧光猝灭作用增强.向体系中加入葫芦[7]脲(CB[7]),CB[7]与萘形成的准轮烷结构1∶1的包结复合物,1~3代Gn-NA中萘与CB[7]的结合常数分别为768,887和823 mol-1?L.准轮烷结构的形成抑制了分子内激基缔合物的生成,使单体荧光发射大大增强.本工作为可调控发光树枝形聚合物的发展提供了一种新的策略.
The polyamine-amine (PAMAM) dendrimer Gn-NA was synthesized from 1 to 3 generations of modified naphthalene and the compounds were identified by 1H NMR, 13C NMR, MALDI-TOF MS and IR spectroscopy. Steady-state and time resolved photophysics The results showed that the adjacent naphthalene groups in Gn-NA molecules in aqueous solution (containing DMSO 0.3% ~ 0.5%, V / V) formed excimer and quenched the fluorescence emission of naphthalene monomer. The fluorescence quenching effect of naphthalene monomer was enhanced, and inclusion complexes of cucurbit [7] urea (CB [7]), CB [7] The binding constants of naphthalene to CB [7] in Gn-NA are 768,887 and 823 mol-1? L, respectively. The formation of the pseudorotaxane structure inhibits the formation of intramolecular excimer and greatly enhances the monomer fluorescence emission. This work provides a new strategy for the development of tunable luminescent dendrimers.