Raman and infrared spectra of barium and strontium hydroxides and hydroxide hydrates

Lutz, H. D.; Eckers, W.; Schneider, G.; Haeuseler, H.

doi:10.1016/0584-8539(81)80048-7

Cited by 80 publications

(43 citation statements)

References 27 publications

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“…(ii) Bifurcacted hydrogen bonds are stronger than equally long H-bonds, which posses only one acceptor group (M611er et al 1993). Furthermore, in the case of bifurcated H-bonds, the temperature dependence of the OH-and OD-bands is negative (Falk et al 1974) likewise as found for OH-ions not involved in H-bonds (Lutz et al 1981).…”

Section: Resultsmentioning

confidence: 80%

“…This interpretation, which is opposite to that of Secco (1988), is proved true despite the very large O--. O distances of 297 and 314 pm, respectively, the high-energy shift of the corresponding OD frequencies by 10 and 27 cm-1 compared to that of free OD-ions (2624 cm-1, Rehfuss et al 1986), and their negative temperature dependence (Lutz et al 1981). If no hydrogen bonds were present, the OH (and OD) bands would be shifted to still higher wavenumbers because metal-oxygen interactions harden the OH (and OD) modes of OH-ions (Lutz et al 1987).…”

Section: Resultsmentioning

confidence: 97%

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Hydrogen bonding in basic copper salts: a spectroscopic study of malachite, Cu2(OH)2CO3, and brochantite, Cu4(OH)6SO4

Schmidt

Lutz

1993

Phys Chem Minerals

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Abstract. Infrared and Raman spectra of the basic copper salts malachite, Cu2(OH)zCOs, and brochantite, Cu4(OH)6SO4, as well as of deuterated and 13C substituted samples are presented and discussed in terms of group theory and the hydrogen bonds present. The main results are that (i) the hydrogen donor strengths of the OH-ions are strongly increased due to the very great synergetic effect of the copper ions, (ii) the acceptor strengths of the H-bond acceptor groups (SO ]-, CO 2-, and OH-ions) are significantly modified by the linkage and coordination of the acceptor atoms -this complicates true assignment of the OH bands observed to the two and six different OH-ions present in malachite and brochantite, respectively -, and (iii) the Cu-O stretching modes at 430-590 cm -1 and 420-520 cm -1 for malachite and brochantite, respectively, exhibit strong, partially covalent Cu-O bonding.

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Section: Resultsmentioning

confidence: 80%

Section: Resultsmentioning

confidence: 97%

Hydrogen bonding in basic copper salts: a spectroscopic study of malachite, Cu2(OH)2CO3, and brochantite, Cu4(OH)6SO4

Schmidt

Lutz

1993

Phys Chem Minerals

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“…Normally rotary modes occur between 300 and 800 cm -1 but have been reported as high as 1050 cm -1 . 26 The higherfrequency 1440 and 1375 cm -1 bands may also be attributed to M 2 CO 3 contamination from the starting alkali hydrosulfide reactants; a doublet is reported between 1450-1410 cm -1 for V 3 asymmetric stretching of the CO 3 2-unit for Li 2 CO 3 . 27 However, the remaining vibrational modes associated with the CO 3 2-unit, namely, V 1 symmetric stretching at 1065 cm -1 (Raman), V 2 out-of-plane bending at 880-850 cm -1 (IR), and V 4 in-plane bending at 720-680 cm -1 (IR, Raman), are not observable in the corresponding IR or Raman spectra.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Amorphous Hydrated Alkali Thio-Hydroxogermanates

2005

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The synthesis, structure, and nonhumidified proton conductivity of the hydrated alkali thiohydroxogermanates, denoted as MxGeSx(OH)4-x·yH2O (1 ≤ x ≤ 4, 0 < y < 8) for M = Na, K, Rb, and Cs, are reported. These materials are generally X-ray amorphous when produced by a low-temperature (75 °C) aqueous solution evaporation−precipitation route. Raman and IR spectroscopies indicate mixed chalcogenide germanium central anions with distinct asymmetric Ge−O and symmetric Ge−S stretching modes observable around 820−754 and 500−325 cm-1, respectively. These thio-oxoanions possess a combination of thermally stable hydroxyl groups and hydrophilic alkali associated with the nonbridging sulfurs. Alternating current impendence measurements performed under anhydrous conditions on low-pressure sealed pellets reveal fast ionic conductivity, 10-3−10-2 S/cm, for typical temperatures between 100 and 275 °C. The observed falloff in conductivity at higher temperatures is consistent with the appearance of endothermic transitions in differential scanning calorimetry measurements of hermetically sealed samples, presumably from the "boiling" or sublimation of a crystalline water sublattice. Corresponding onset temperatures were observed between 150 and 275 °C and dependent on the alkali and composition. The synthesis, structure, and nonhumidified proton conductivity of the hydrated alkali thiohydroxogermanates, denoted as M x GeS x (OH) 4-x ‚yH 2 O (1 e x e 4, 0 < y < 8) for M ) Na, K, Rb, and Cs, are reported. These materials are generally X-ray amorphous when produced by a low-temperature (∼75°C) aqueous solution evaporation-precipitation route. Raman and IR spectroscopies indicate mixed chalcogenide germanium central anions with distinct asymmetric Ge-O and symmetric Ge-S stretching modes observable around 820-754 and 500-325 cm -1 , respectively. These thio-oxoanions possess a combination of thermally stable hydroxyl groups and hydrophilic alkali associated with the nonbridging sulfurs. Alternating current impendence measurements performed under anhydrous conditions on lowpressure sealed pellets reveal fast ionic conductivity, 10 -3 -10 -2 S/cm, for typical temperatures between 100 and 275°C. The observed falloff in conductivity at higher temperatures is consistent with the appearance of endothermic transitions in differential scanning calorimetry measurements of hermetically sealed samples, presumably from the "boiling" or sublimation of a crystalline water sublattice. Corresponding onset temperatures were observed between 150 and 275°C and dependent on the alkali and composition. Under dry atmosphere conditions, thermogravimetric analysis mass loss measurements indicate continuous mass loss above the preparation temperature of ∼75°C.

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“…9. Raman spectra of (a) the high-pressure form of Ca(OH) 2 at Raman spectrum of Sr(OH) 2 (27,29) to that of the high-7 GPa and (b) an ambient spectrum of Sr(OH) 2 . pressure Ca(OH) 2 , indeed, reveals a striking similarity in the overall pattern and number of bands between the two phases (see Fig. 9).…”

Section: B Grain Size Effect and Amorphizationmentioning

confidence: 99%

New High-Pressure Phase and Pressure-Induced Amorphization of Ca(OH)2: Grain Size Effect

Ekbundit

Leinenweber

Yarger

et al. 1996

Journal of Solid State Chemistry

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Raman and infrared spectra of barium and strontium hydroxides and hydroxide hydrates

Cited by 80 publications

References 27 publications

Hydrogen bonding in basic copper salts: a spectroscopic study of malachite, Cu2(OH)2CO3, and brochantite, Cu4(OH)6SO4

Hydrogen bonding in basic copper salts: a spectroscopic study of malachite, Cu2(OH)2CO3, and brochantite, Cu4(OH)6SO4

Synthesis and Characterization of Amorphous Hydrated Alkali Thio-Hydroxogermanates

New High-Pressure Phase and Pressure-Induced Amorphization of Ca(OH)2: Grain Size Effect

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