NMR relaxation of the orientation of single segments in semiflexible dendrimers

NMR relaxation of the orientation of single segments in semiflexible dendrimers

We study the orientational properties of labeled segments in semiflexible dendrimers making use of the viscoelastic approach of Dolgushev and Blumen [J. Chem. Phys. 131, 044905 (2009)]. We focus on the segmental orientational autocorrelation functions (ACFs), which are fundamental for the frequency-...

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Veröffentlicht in:The Journal of chemical physics 2014-06, Vol.140 (24), p.244904-244904
Hauptverfasser: Markelov, Denis A, Dolgushev, Maxim, Gotlib, Yuli Ya, Blumen, Alexander
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DENDRIMERS
FREQUENCY DEPENDENCE
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
NMR
NUCLEAR MAGNETIC RESONANCE
SPIN-LATTICE RELAXATION
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container_title The Journal of chemical physics
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creator Markelov, Denis A
Dolgushev, Maxim
Gotlib, Yuli Ya
Blumen, Alexander
description We study the orientational properties of labeled segments in semiflexible dendrimers making use of the viscoelastic approach of Dolgushev and Blumen [J. Chem. Phys. 131, 044905 (2009)]. We focus on the segmental orientational autocorrelation functions (ACFs), which are fundamental for the frequency-dependent spin-lattice relaxation times T1(ω). We show that semiflexibility leads to an increase of the contribution of large-scale motions to the ACF. This fact influences the position of the maxima of the [1/T1]-functions. Thus, going from outer to inner segments, the maxima shift to lower frequencies. Remarkably, this feature is not obtained in the classical bead-spring model of flexible dendrimers, although many experiments on dendrimers manifest such a behavior.
doi_str_mv 10.1063/1.4884024
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subjects DENDRIMERS
FREQUENCY DEPENDENCE
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
NMR
NUCLEAR MAGNETIC RESONANCE
SPIN-LATTICE RELAXATION
title NMR relaxation of the orientation of single segments in semiflexible dendrimers
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