The hydrogen bond system in natrochalcite-type compounds ? an FTIR spectroscopic study of the H3O2 unit

• Published in: Mineralogy and petrology Vol. 61; no. 1-4; pp. 223 - 235
• Main Authors: Beran, A., Giester, G., Libowitzky, E.
• Format: Journal Article
• Language: English
• Published: Wien Springer Nature B.V 01-01-1997
• Subjects: Hydrogen; Hydrogen bonds; Spectrum analysis
• ISSN: 0930-0708; 1438-1168
• DOI: 10.1007/BF01172486

FTIR spectroscopy was used to study the vibrational behaviour of the hydrogen bond system of the H^sub 3^O^sub 2^ unit, present with widely varying O-H...O distances in natrochalcite-type compounds, MeCu^sub 2^(H^sub 3^O^sub 2^)(ZO^sub 4^)^sub 2^ (Me = Na, K; Z=S, Se). Absorption bands of powder and polarized single-crystal spectra of non-deuterated and partially deuterated natrochalcite phases are assigned to stretching and bending modes of clearly divided OH^sup -^ and H^sub 2^O groups. These results are indicative for a not centro-symmetric configuration of the H^sub 3^O^sub 2^ unit and confirm the presence of a very strong hydrogen bond with a split hydrogen atom position.[PUBLICATION ABSTRACT]