NMR crystallography of α-poly(L-lactide)

A complementary approach that combines NMR measurements, analysis of X-ray and neutron powder diffraction data and advanced quantum mechanical calculations was employed to study the α-polymorph of L-polylactide. Such a strategy, which is known as NMR crystallography, to the best of our knowledge, is...

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Veröffentlicht in:PCCP. Physical chemistry chemical physics (Print) 2013-03, Vol.15 (9), p.3137-3145
Hauptverfasser: PAWLAK, Tomasz, JAWORSKA, Magdalena, POTRZEBOWSKI, Marek J
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JAWORSKA, Magdalena
POTRZEBOWSKI, Marek J
description A complementary approach that combines NMR measurements, analysis of X-ray and neutron powder diffraction data and advanced quantum mechanical calculations was employed to study the α-polymorph of L-polylactide. Such a strategy, which is known as NMR crystallography, to the best of our knowledge, is used here for the first time for the fine refinement of the crystal structure of a synthetic polymer. The GIPAW method was used to compute the NMR shielding parameters for the different models, which included the α-PLLA structure obtained by 2-dimensional wide-angle X-ray diffraction (WAXD) at -150 °C (model M1) and at 25 °C (model M2), neutron diffraction (WAND) measurements (model M3) and the fully optimized geometry of the PLLA chains in the unit cell with defined size (model M4). The influence of changes in the chain conformation on the (13)C σ(ii) NMR shielding parameters is shown. The correlation between the σ(ii) and δ(ii) values for the M1-M4 models revealed that the M4 model provided the best fit. Moreover, a comparison of the experimental (13)C NMR spectra with the spectra calculated using the M1-M4 models strongly supports the data for the M4 model. The GIPAW method, via verification using NMR measurements, was shown to be capable of the fine refinement of the crystal structures of polymers when coarse X-ray diffraction data for powdered samples are available.
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source MEDLINE; Royal Society Of Chemistry Journals; Alma/SFX Local Collection
subjects Applied sciences
Crystal structure
Crystallography
Crystallography, X-Ray
Diffraction
Exact sciences and technology
Magnetic Resonance Spectroscopy - methods
Mathematical models
Models, Molecular
Molecular Conformation
Nuclear magnetic resonance
Organic polymers
Physicochemistry of polymers
Polyesters - chemistry
Properties and characterization
Scattering, Small Angle
Shielding
Spectra
Structure, morphology and analysis
X-rays
title NMR crystallography of α-poly(L-lactide)
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