✍ Scribed by F. Lauprêtre; F. Gény
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Carbon-13 and proton spin-lattice relaxation times have been discussed in terms of intramolecular motions for solutions of poly(dimethyl-and poly(diphenylphenylene.oxides). The most suitable auto-correlation function seems to be a sum of several exponential modes. Comparison with the results of previous conformational calculations allows proposal of an assignment of the motional processes that are involved in the magnetic relaxation of poly(dimethylphenylene oxide).
R6sum6--Des mesures de temps de relaxation, effectu6es par RMN du proton et du carbone 13 sur des solutions de poly(dim6thyl-et poly(diph6nylph6nyl+ne oxydes) ont 6t6 interpr6t6es en termes de mouvements. La forme la mieux appropri6e de la fonction d'autocorr61ation correspond/~ une somme de plusieurs exponentielles. Une comparaison avec les calculs conformationnels a permis de pr6ciser, au moins pour le poly(dim6thylph6nyl+ne oxyde), le type des mouvements impliqu6s.
📜 SIMILAR VOLUMES
The assignments of 13C and 1H NMR spectra for madeirane triterpenes are reported. The assignments were made on the basis of two-dimensional homonuclear 1H, 1H (COSY) and of 1H detected 1H, 13C heteronuclear correlation (HMQC) and also from a series of one-dimensional selective INEPT experiments. 19