Hydrogen bonding in solid hydroxides with strongly polarising metal ions, β-Be(OH)2 and ε-Zn(OH)2

“…The vibrational properties of ε-Zn(OH) 2 have been reported and analyzed earlier. 23 , 24 In ε-Zn(OH) 2 , Zn ions are tetrahedrally coordinated by four OH – ions, at distances between 1.94 and 1.96 Å, and each OH – ion is shared by two Zn ions. The topology of the arrangement of Zn(OH) 4 tetrahedra is equivalent to that of SiO 4 tetrahedra in β-cristobalite.…”

Section: Results and Discussionmentioning

confidence: 99%

Layered Zinc Hydroxide Dihydrate, Zn₅(OH)₁₀·2H₂O, from Hydrothermal Conversion of ε-Zn(OH)₂ at Gigapascal Pressures and its Transformation to Nanocrystalline ZnO

et al. 2020

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Layered zinc hydroxides (LZHs) with the general formula (Zn 2+ ) x (OH – ) 2 x − my (A m – ) y · n H 2 O (A m – = Cl – , NO 3 – , ac – , SO 4 2– , etc) are considered as useful precursors for the fabrication of functional ZnO nanostructures. Here, we report the synthesis and structure characterization of the hitherto unknown “binary” representative of the LZH compound family, Zn 5 (OH) 10 ·2H 2 O, with A m – = OH – , x = 5, y = 2, and n = 2. Zn 5 (OH) 10 ·2H 2 O was afforded quantitatively by pressurizing mixtures of ε-Zn(OH) 2 (wulfingite) and water to 1–2 GPa and applying slightly elevated temperatures, 100–200 °C. The monoclinic crystal structure was characterized from powder X-ray diffraction data (space group C 2/ c , a = 15.342(7) Å, b = 6.244(6) Å, c = 10.989(7) Å, β = 100.86(1)°). It features neutral zinc hydroxide layers, composed of octahedrally and tetrahedrally coordinated Zn ions with a 3:2 ratio, in which H 2 O is intercalated. The interlayer d (200) distance is 7.53 Å. The H-bond structure of Zn 5 (OH) 10 ·2H 2 O was analyzed by a combination of infrared/Raman spectroscopy, computational modeling, and neutron powder diffraction. Interlayer H 2 O molecules are strongly H-bonded to five surrounding OH groups and appear orientationally disordered. The decomposition of Zn 5 (OH) 10 ·2H 2 O, which occurs thermally between 70 and 100 °C, was followed in an in situ transmission electron microscopy study and ex situ annealing experiments. It yields initially 5–15 nm sized hexagonal w-ZnO crystals, which, depending on the conditions, may intergrow to several hundred nm-large two-dimensional, flakelike crystals within the boundary of original Zn 5 (OH) 10 ·2H 2 O particles.

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“…Other modes originating from OH such as ZnOH bending and OH libration are observed at lower wavenumbers (1100-750 cm −1 ). e bands in the range from 1000 to 1120 cm −1 could be interpreted as motion of hydrogen atoms perpendicular to the connection line of the two nearest metal ions in type OM 2 H unit, whereas the bands in the range from 700 to 800 cm −1 could be interpreted as those parallel in relation to tangential to this line [20]. Zinc hydroxide chloride spectrum shows characteristic peaks at about 1040, 900, and 715 cm −1 , which have also previously been described by Srivastava and Secco [21].…”

Section: Ft-ir Spectroscopymentioning

confidence: 95%

XPS and FT-IR Characterization of Selected Synthetic Corrosion Products of Zinc Expected in Neutral Environment Containing Chloride Ions

Winiarski

Winiarska

Szczygieł

et al. 2018

Journal of Spectroscopy

163

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ZnO, Zn(OH)2, Zn5(OH)8Cl2·H2O, ZnCO3, and Zn5(CO3)2(OH)6 synthetic powders were prepared by chemical or solid-state method. Their crystalline phase structure, thermal behavior, and morphology were examined. Characteristic infrared absorbance bands were estimated by means of FT-IR ATR spectroscopy. X-ray photoelectron spectroscopy (XPS) allowed to calculate the modified Auger parameters (α ′) thereof to 2010.2, 2009.3, 2009.4, 2009.7, and 2009.8 eV, respectively for ZnO, Zn(OH)2, Zn5(OH)8Cl2·H2O, ZnCO3, and Zn5(CO3)2(OH)6. Finally, comparison of surface composition may be crucial to evaluation of the unknown experimental spectra of corrosion products formed on the surface of zinc alloy coatings exposed in NaCl solution.

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Hydrogen bonding in solid hydroxides with strongly polarising metal ions, β-Be(OH)2 and ε-Zn(OH)2

Cited by 45 publications

References 21 publications

Raman scattering and photoluminescence studies of ZnO nanowhiskers assembled as flowers in the presence of fullerene

Raman scattering and photoluminescence studies of ZnO nanowhiskers assembled as flowers in the presence of fullerene

Layered Zinc Hydroxide Dihydrate, Zn₅(OH)₁₀·2H₂O, from Hydrothermal Conversion of ε-Zn(OH)₂ at Gigapascal Pressures and its Transformation to Nanocrystalline ZnO

XPS and FT-IR Characterization of Selected Synthetic Corrosion Products of Zinc Expected in Neutral Environment Containing Chloride Ions

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Hydrogen bonding in solid hydroxides with strongly polarising metal ions, β-Be(OH)2 and ε-Zn(OH)2

Cited by 45 publications

References 21 publications

Raman scattering and photoluminescence studies of ZnO nanowhiskers assembled as flowers in the presence of fullerene

Raman scattering and photoluminescence studies of ZnO nanowhiskers assembled as flowers in the presence of fullerene

Layered Zinc Hydroxide Dihydrate, Zn5(OH)10·2H2O, from Hydrothermal Conversion of ε-Zn(OH)2 at Gigapascal Pressures and its Transformation to Nanocrystalline ZnO

XPS and FT-IR Characterization of Selected Synthetic Corrosion Products of Zinc Expected in Neutral Environment Containing Chloride Ions

Contact Info

Product

Resources

About

Layered Zinc Hydroxide Dihydrate, Zn₅(OH)₁₀·2H₂O, from Hydrothermal Conversion of ε-Zn(OH)₂ at Gigapascal Pressures and its Transformation to Nanocrystalline ZnO