Naslov
Comparative Raman study of hydrogen bonding in LiHC2O4∙H2O, KHC2O4, NaHC2O4∙H2O, and (COOH)2∙6H2O

Autori
Mohaček Grošev, Vlasta ; Grdadolnik, Jože

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
XXIV International Conference on Raman Spectroscopy / Juergen Popp, Volker Deckert - Jena : Friedrich Schiller Universitaet, 2014, 223-223

Skup
XXIV International Conference on Raman Spectroscopy

Mjesto i datum
Jena, Njemačka, 10.08.2014. - 15.08.2014

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
sodium oxalate; potassium oxalate; lithium oxalate; oxalic acid sesquihydrate; Raman

Sažetak
Hydrogen oxalates form chains of strong hydrogen bonds connecting carboxylic and carboxylate groups, the shortest O-H ∙∙∙O bond being 2.490 Ǻ in LiHC2O4∙H2O, 2.533 Ǻ in KHC2O4, 2.571 Ǻ in NaHC2O4∙H2O, and 2.559 Ǻ in (COOH)2∙6H2O [1-3]. Spectroscopic signatures of these bonds are rather prominent bending deformation of COH carboxylic group around 1461 cm-1, C-O(H) stretching around 1404 cm-1 and a ν(CO2-) stretching at 1437 cm-1 in the case of LiHC2O4∙H2O, and at 1414 and 1458 cm-1 in NaHC2O4∙H2O. Besides strong carbonyl stretching vibrations, one observes and asymmetrical carboxylate stretching vibrations around 1667 cm- 1. An unusual intensity dependence or Raman spectra on the orientation of linearly polarized electrical field suggests possible switching of proton positions between donor and acceptor [4].

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija

POVEZANOST RADA