Abstract
The dynamical stacking structure of the phenyl rings in racemic poly(γ-benzyl glutamate) (PBG) deuterated in benzyl methylene or phenyl ring groups was investigated using solid state 2H NMR quadrupole echo spectroscopy. Line shapes and spin-lattice relaxation times of racemic PBG were compared with those of poly(γ-benzyl l-glutamate) (PBLG). The large amplitude motions along a side chain are rather restricted in the stacked state, while the phenyl rings at the end of the side chain undergo a 180°-flipping motion even in the stacked state as in PBLG. The amplitude of the fast librations in the stacked state is smaller by several degrees than that of PBLG. About 75% of the side chains participate in the stacking for an equi-weight mixture of l- and d-molecules.
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