Molecular dynamics in comb-like ionene as studied by NMR

Proton and fluorine second moment and spin-lattice relaxation times T-1 and T-1p have been employed to study molecular dynamics in the comb-like 1-6,6 -16-Me-BF4 ionene in the temperature range from 110 up to 300 K. The existe nce of motions of methyl groups, trans-gauche isomerization, and/or rotatio n of the main- and side-chain methylene groups, as well as isotropic reorie ntation of tetrafluoroborate ions were established. The observed relaxation behaviors are explained by motional models which assume Davidson-Cole asym metrical distribution of correlation rimes. The best-fit motional parameter s are given.