Inter layer interaction in Ca-Fe layered double hydroxides intercalated with nitrate and chloride species

Abstract : Ca-Fe layered double hydroxide (LDH) intercalated with chloride and nitrate ions has been synthesized with varying Ca-II:Fe-III molar ratios of the initial solution. Phase pure LDH is observed with Ca-II:Fe-III molar ratio of 2:1 and a mixture of LDH and Ca(OH)(2) is formed for Ca-II:Fe-III molar ratios higher than 2:1. Vibrational spectroscopies (Raman and IR) were used successfully to understand the interaction between the cationic and anionic sheets. The Raman bands positions at lower frequencies (150-600 cm(-1)) are intimately correlated to the nature of the divalent and trivalent ions but also to the nature of the anions. Indeed, a shift of similar to 9 cm(-1) is observed for the Raman double bands situated in the 300-400 cm(-1) region when comparing Raman spectra of CaFe-LDH containing either nitrate or chloride ions. Two types of nitrate environments are observed namely free (non-hydrogen bonded) nitrate and nitrate hydrogen bonded to the interlayer water or to the `brucite-like' hydroxyl surface. Multiple types of water structure are observed and would result from different hydrogen bond structures. Water bending modes are identified at 1645 cm(-1) greater than the one observed for LDH intercalated with chloride anions (1618 cm(-1)), indicating that the water is strongly hydrogen bonded to the nitrate anions.
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Journal of Molecular Structure, Elsevier, 2015, 1102, pp.253-260. 〈10.1016/j.molstruc.2015.08.064〉
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https://hal.univ-lorraine.fr/hal-01503743
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Soumis le : vendredi 7 avril 2017 - 14:45:08
Dernière modification le : jeudi 24 mai 2018 - 10:32:01

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Muayad Al-Jaberi, Sébastien Naille, Manuel Dossot, Christian Ruby. Inter layer interaction in Ca-Fe layered double hydroxides intercalated with nitrate and chloride species. Journal of Molecular Structure, Elsevier, 2015, 1102, pp.253-260. 〈10.1016/j.molstruc.2015.08.064〉. 〈hal-01503743〉

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