Growth and spectroscopy studies of ADP single crystals with l-proline and l-arginine amino acids

Ammonium dihydrogen orthophosphate (ADP) single crystals were grown with l-proline and l-arginine amino acids as additives at 4% molar concentrations. X-ray diffractograms, vibrational FT-IR, and Raman and NMR MAS of 31P and 1H spectra of pure and treated compounds were recorded at room temperature and interpreted. A shift of the wavenumbers of some internal modes of both PO4 and NH4 tetrahedrons species was observed. At the same time, some characteristic vibrational modes of N–H and C–H bonds of the organic molecules appeared in IR spectra. However, NMR results show a little shift of the resonance of the phosphorus and hydrogen nucleus, associated with some shoulders for this latter. These observations indicate that the host-additives interactions were achieved.