The configurational sensitivity of the chemical shift of methylene carbons has been analyzed theoretically in terms of a perturbative approach. Theoretical results and computations have been applied successfully to new experimental data obtained from model compounds of the Sαβ resonance. It has been shown that the carbon in β position with respect to the first methine of a regioregular sequence follows the same simple trend of the corresponding carbon atoms in α position. The tiny chemical shift spreadings of the Sαβ resonance due to the relative configuration of the nearest methyl groups in α and β position showed a single inversion with respect to theoretical expectation.
Simple Trends in the Methylene Regions of the NMRSpectrum of Poly(propylene) and Ethylene-PropyleneCopolymers
MONACO, Guglielmo;
2006-01-01
Abstract
The configurational sensitivity of the chemical shift of methylene carbons has been analyzed theoretically in terms of a perturbative approach. Theoretical results and computations have been applied successfully to new experimental data obtained from model compounds of the Sαβ resonance. It has been shown that the carbon in β position with respect to the first methine of a regioregular sequence follows the same simple trend of the corresponding carbon atoms in α position. The tiny chemical shift spreadings of the Sαβ resonance due to the relative configuration of the nearest methyl groups in α and β position showed a single inversion with respect to theoretical expectation.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
