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.
中科院分区:
文献类型:
--
作者:
Sebby, Karl B.;Walter, Eric D.;Usselman, Robert J.;Cloninger, Mary J.;Singel, David J.
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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DOI:
10.1051/jphyslet:01983004409035100
发表时间:
1983-01-01
期刊:
JOURNAL DE PHYSIQUE LETTRES
影响因子:
--
作者:
DEGENNES, PG;HERVET, H
通讯作者:
HERVET, H
DOI:
10.1007/3418_030
发表时间:
2006-01-01
期刊:
DENDRIMER CATALYSIS
影响因子:
--
作者:
Berger, Alexsandro;Gebbink, Robertus J. M. Klein;van Koten, Gerard
通讯作者:
van Koten, Gerard
影响因子:
2.9
作者:
Altenbach, C;Oh, KJ;Hubbell, WL
通讯作者:
Hubbell, WL
影响因子:
4.4
作者:
Karatasos, K;Adolf, DB;Davies, GR
通讯作者:
Davies, GR
影响因子:
4.9
作者:
Adronov, A;Fréchet, JMJ
通讯作者:
Fréchet, JMJ