An exceptional series of phase transitions in hydrophobic amino acids with linear side chains

Görbitz, C.H.; Karen, P.; Dušek, M.; Petříček, V.

doi:10.1107/S2052252516010472

Figure 7
Temperature-dependent positions of H atoms interacting with the syn lone pairs of the L-Nva carboxylate group. From their starting positions at 100 K (blue), both H1B and H1A move towards more central positions as the temperature increases through 220 K (green) to 270 K (orange). After transition 2 in Fig. 1