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- W2356074057 abstract "Abstract The solid state dynamics of three helical polyguanidines differing only in their stereochemistry was investigated by 13C CP/MAS NMR. From these studies, the structures of the polyguanidines were confirmed, and the 13C spin–lattice relaxation times in the rotating frame were measured. The relaxation times of all the polyguanidines indicated that they undergo fast motions, i.e. motions on the fast side of the T1ρ minimum. The main chain carbon of polyguanidine I-(R/S), with equal amounts of (R) and (S) chiral side chains, has higher activation energy, 10.7 kJ/mol, than the analogous polymers with enantiomerically pure side chains (I-(R) and I-(S)), 5.1 kJ/mol." @default.
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- W2356074057 date "1999-03-01" @default.
- W2356074057 modified "2023-09-27" @default.
- W2356074057 title "The T1ρ 13C spin–lattice relaxation time of helical polyguanidines" @default.
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- W2356074057 doi "https://doi.org/10.1016/s0038-1098(99)00038-1" @default.
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