The solid-state 1 H, 13 C, MAS NMR, 1 H-13 C and 1 H-15 N CPMAS NMR spectra were registered at the spinning rates of 12 kHz for 1 H and 5 kHz for all other measurements using a Bruker Avance III 400WB spectrometer. 1 H, 13 C and N chemical shifts are quoted in ppm from: TMS (0 ppm) and α-glycine (secondary reference, C=O at 176.0 ppm and NH3 + at 347.6 ppm on the nitromethane scale, respectively).