The Equilibria of Cupric Hydroxysalts in Mixed Aqueous Solutions of Cupric and Alkali Salts at 25°

Näsänen, Reino; Tamminen, Veikko.

doi:10.1021/ja01174a027

Cited by 42 publications

(14 citation statements)

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“…(6)(7)(8)(9)(10)(11) The results of these investigations are in good agreement with each other. Wood and Garrels, (12) Vieillard, (13) and the authors of some reference books on thermodynamic properties of minerals and individual substances (14)(15)(16) recommend as the most reliable the value of the Gibbs free energy of formation of atacamite from the elements calculated from the Barton and Bethke equilibrium data.…”

Section: Introductionsupporting

confidence: 80%

The molar heat capacity of hydrous copper chloride: atacamite Cu2Cl(OH)3

Bisengalieva

Киселева

Melchakova

et al. 1997

The Journal of Chemical Thermodynamics

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Section: Introductionsupporting

confidence: 80%

The molar heat capacity of hydrous copper chloride: atacamite Cu2Cl(OH)3

Bisengalieva

Киселева

Melchakova

et al. 1997

The Journal of Chemical Thermodynamics

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“…The only solid copper hydroxy nitrate for which some solubility data are available is Cu(OH) 1.5 (NO 3 ) 0.5 (Näsänen and Tamminen 1949). Calculations show that all the samples had solution conditions more than an order of magnitude undersaturated with respect to this solid.…”

Section: Sorption Samples-wet Chemical Resultsmentioning

confidence: 99%

XAFS study of Cu model compounds and Cu²⁺sorption products on amorphous SiO₂, γ-Al₂O₃, and anatase

Cheah

Brown

Parks

2000

American Mineralogist

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The primary objective of this study is to determine the effect of substrate type on the coordination environments of Cu 2+ adsorbed on amorphous SiO 2 , γ-Al 2 O 3 , and anatase at a surface coverage of approximately 1 µmol/m 2 . We also collected X-ray absorption fine structure (XAFS) data for several Cu 2+ -containing model compounds, including tenorite ( VI CuO), spertiniite [ VI Cu(OH) 2 ], dioptase ( VI CuSiO 2 ·H 2 O), shattuckite [ VI Cu 5 (SiO 3 ) 4 (OH) 2 ], chrysocolla [ VI (Cu,Al) 2 H 2 Si 2 O 5 (OH) 4 ·nH 2 O], and Cu 2+ acetate monohydrate [ VI Cu(CH 3 CO 2 ) 2 ·H 2 O], for comparison with the sorption sample data. Detailed analysis of these model compounds indicates that the bonding of second neighbors surrounding a central Cu absorber determines whether these second neighbors can be detected by XAFS. The XAFS results of Cu 2+ sorption samples are consistent with the presence of Jahn-Teller distorted Cu 2+ (O,OH) 6 octahedra, with four equatorial Cu-O bonds (1.95 Å) and two longer axial bonds; the axial Cu-O bonds are difficult to characterize quantitatively by XAFS spectroscopy. Cu 2+ sorbed on amorphous SiO 2 was found to have Cu second and third neighbors at 2.95 Å, 3.30 Å, and 5.72 Å, but no Cu-Si correlation was detected for these sorption products associated with amorphous SiO 2 . Based on XAFS and wet chemical results, it seems likely that a Cu(OH) 2 precipitate has formed in the Cu 2+ /amorphous SiO 2 system. Cu 2+ sorbed on γ-Al 2 O 3 is present as a mixture of monomeric, dimeric, and perhaps a small number of oligomeric hydroxo-bridged Cu(O,OH) 6 species with a Cu-Cu distance of approximately 2.95 Å. Sorbed Cu 2+ on anatase is present predominantly as hydroxo-bridged Cu dimers. At similar sorption densities, Cu 2+ cluster sizes on amorphous SiO 2 are significantly larger than those on γ-Al 2 O 3 or anatase, indicating that the substrate has an important effect on the type of Cu 2+ sorption complex or precipitates formed.

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“…and hydroxyl ions in Cu (OH) (ClO ) are reported to be rather disordered (2,21), and difficulties in locating the terminal oxygen atoms of the ordered nitrate in Cu (OH) (NO ) from XRPD data have also been encountered (22).…”

Section: X-ray Powder Diffractometrymentioning

confidence: 99%

Preparation, Characterization, andab initioX-Ray Powder Diffraction Study of Cu2(OH)3(CH3COO)·H2O

Masciocchi

Corradi

Sironi

et al. 1997

Journal of Solid State Chemistry

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The Equilibria of Cupric Hydroxysalts in Mixed Aqueous Solutions of Cupric and Alkali Salts at 25°

Cited by 42 publications

References 0 publications

The molar heat capacity of hydrous copper chloride: atacamite Cu2Cl(OH)3

The molar heat capacity of hydrous copper chloride: atacamite Cu2Cl(OH)3

XAFS study of Cu model compounds and Cu²⁺sorption products on amorphous SiO₂, γ-Al₂O₃, and anatase

Preparation, Characterization, andab initioX-Ray Powder Diffraction Study of Cu2(OH)3(CH3COO)·H2O

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The Equilibria of Cupric Hydroxysalts in Mixed Aqueous Solutions of Cupric and Alkali Salts at 25°

Cited by 42 publications

References 0 publications

The molar heat capacity of hydrous copper chloride: atacamite Cu2Cl(OH)3

The molar heat capacity of hydrous copper chloride: atacamite Cu2Cl(OH)3

XAFS study of Cu model compounds and Cu2+sorption products on amorphous SiO2, γ-Al2O3, and anatase

Preparation, Characterization, andab initioX-Ray Powder Diffraction Study of Cu2(OH)3(CH3COO)·H2O

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About

XAFS study of Cu model compounds and Cu²⁺sorption products on amorphous SiO₂, γ-Al₂O₃, and anatase