End-group distributions of multiple generations of spin-labeled PAMAM dendrimers.

End-group distributions of multiple generations of spin-labeled PAMAM dendrimers.
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DOI:
10.1021/jp112390d
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发表时间:
2011-04-28
影响因子:
3.3
通讯作者:
Singel, David J.
Singel, David J.
中科院分区:
化学3区
文献类型:
--
作者:
Sebby, Karl B.;Walter, Eric D.;Usselman, Robert J.;Cloninger, Mary J.;Singel, David J.

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树枝状大分子是展示功能分子组分的有吸引力的模板。由于树枝状大分子体系的行为在很大程度上取决于这些分子组分对外部环境的可及性,以及附着在树枝状大分子末端支链(端基)上的官能团的空间排列,因此确定端基位置的技术是非常可取的。在这份报告中,我们描述了一种分析多代聚酰胺胺(PAMAM)树枝状大分子的EPR谱的方法,这些树枝状大分子的末端基团上有不同比例的自旋标签。谱被处理为窄自旋标记谱和可变线宽函数的卷积。描述具有自旋标签加载的最佳拟合线加宽函数的参数的趋势揭示了标签的自旋环境的空间排列和同质性。我们观察到端基分布从第三代(G(3))转移到G(4)树枝状大分子,这表明形态从开放的、延伸的结构转变为更密集、紧凑的排列。
Dendrimers are attractive templates to display functional molecular components. Since the behavior of dendrimer systems can depend greatly on the accessibility of these molecular components to the external environment, and on the spatial arrangement of functional groups attached to the dendrimer terminal branches (end-groups), techniques to determine the locations of end-groups are highly desirable. In this report, we describe a method to analyze the EPR spectra of multiple generations of poly(amidoamine) (PAMAM) dendrimers which have spin-labels attached to end-groups in variable percentages of the total number of available sites. The spectra are treated as a convolution of a narrow spin-label spectrum and a variable line broadening function. Trends in the parameters that describe the best-fit line broadening function with spin-label loading reveal the spatial arrangements and homogeneity of spin environments of the labels. We observe a shift in the end-group distribution from generation 3 (G(3)) to G(4) dendrimers that indicates a change in morphology from an open, extended structure to a more dense, compact arrangement.
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发表时间: 1983-01-01
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