THE O-H AND O-D STRETCHING VIBRATIONS IN THE HYDRATES OF SODIUM AND POTASSIUM SACCHARINATE - SPECTRA-STRUCTURE CORRELATIONS

The infrared spectra of the two hydrates of sodium saccharinate in the region of the OH and O-D stretching vibrations of protiated and partially deuterated samples are considerably different. The less stable monoclinic form is obviously a higher hydrate which is easily converted into the more stable triclinic one. The observed infrared frequencies for the triclinic crystals are correlated with the crystallographically determined Ow⋯O and Ow⋯N distances. The infrared spectra of the sodium compounds in the region of the OH and O-D stretching vibrations are compared with those of potassium saccharinate. © 1990.