Abstract
The motions of the phosphite anions and glycinium cations in H 3 NCH 2 COOH·H 2 PO 3 (GPI) and its deuterated analogue (DGPI) were investigated by 1 H, 13 C and 31 P spin–lattice relaxation times T 1 . For both GPI and DPGI, T 1 's of the 1 H, 13 C and 31 P nuclei reflect the amino rotation, methylene libration and motion of the phosphite anions, respectively. Activation energies obtained from T 1 's of 1 H, 13 C and 31 P nuclei are 28.6(2), 26.0(4) and 26.2(4) kJ/mol for GPI and are 34.9(6), 27(1), 47(2) kJ/mol for DGPI, respectively. The deuterium substitution increases E a for the motion influenced by the hydrogen bonding. In all the observed motions, correlation times of DGPI are larger than those of GPI.
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