Isotope effect and hydrogen bonding in crystalline hydrazinium hydrogen oxalate, N2H5HC2O4

Hydrogen-bond studies. LXXV. An X-ray diffraction study of normal and deuterated hydrazinium hydrogen oxalate, N2H5HC2O4 and N2D5DC2O4

“…A final remark is warranted in connexion with the earlier referred to infrared study of Lindgren et al (1969). Evidence was found to suggest that the symmetric O...H...O bond in HYHOX became asymmetric on deuteration, a prediction which is vindicated by the present findings.…”

“…The feasibility of such movements has also been demonstrated in electrostatic calculations made by Lundgren, Liminga & Olovsson (1971). It was, however, a comparative infrared-spectroscopic study of the normal and deuterated compounds down to liquid-nitrogen temperature (Lindgren, de Villepin & Novak, 1969) which first awakened us to the need for an investigation of the deuterated crystal structure. Significant differences were observed in the low-temperature spectra, and these were found to persist, though to a lesser extent, even at room temperature.…”

Vibrational Spectra of N2H5HC2O4 and N2D5DC2O4

“…3. The corresponding infrared spectra (600-3500 cm-') are not reproduced, being essentially similar to those already reported (4,5). To facilitate the discussion, the spectra of cpystalline HyHOx will be analyzed first, using the closely resembling room-temperature spectra of the deuterated compound.…”

“…Some of these involve mainly the Hf ions and are responsible for the very broad absorption feature with maximum near 650 cm-' in the infrared spectrum (5). Others involve mostly the heavier ions since they must account for the very low-frequency infrared-active modes at 76, 99, and 119 cm-'.…”

FT-IR, Raman, and SERS Spectra of Arcaine Sulfate

“…Identification and interpretation of the vibrational frequencies can reveal information regarding the presence of NH (charged and uncharged) and CH groups. It is well established that the uncharged NH group has stretching frequencies in the region 3400-3200 cm\ while the charged group has frequencies in the range 3000-2800 cm\ (8,9). Observation of IR bands in the region 2750-3350 cm\ shows the presence of both charged and uncharged NH groups in the compound.…”