Identification of peroxo groups in supramolecular layered structures as probed by Raman spectroscopy

Peroxide-containing supramolecular structures prepared by reacting lithium aluminum layered double hydroxides (Li-Al LDHs) with concentrated hydrogen peroxide solutions were characterized by Raman spectroscopy. These compounds were formulated as LiAl₂(OH)₆](OH) · H₂O₂ · H₂O(I) and LiAl₂(OH)₆](OOH) · H₂O₂ · H₂O(II). The frequencies 830 and 849 cm⁻¹ in the spectra of compounds I and II were assigned to O—C stretching vibrations in two nonequivalent peroxo groups. The band at 866 cm⁻¹ in compound II was assigned to O—O vibrations in the hydroperoxo group (OOH)⁻. Proceeding from calculated strength factors, we inferred that the O—O bond in the hydroperoxo group of compound II is stronger than in the H₂O₂ solvating group. Original Russian Text ? T.A. Tripol’skaya, I.V. Pokhabova, P.V. Prikhodchenko, G.P. Pilipenko, E.A. Legurova, N.A. Chumaevskii, 2009, published in Zhurnal Neorganicheskoi Khimii, 2009, Vol. 54, No. 3, pp. 513–515.