Solubility and Ionic Processes in the Cu X 2 ? MX ?H 2 O ( X ? =Cl ? , Br ? ; M + =Li + , Na + , K + , NH 4 + , Cs + ) Systems

Chernykh, L. V.; Eysseltová, Jitka; Skripkin, M. Yu.

doi:10.1007/s00706-002-0583-7

Cited by 12 publications

(7 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The solubility value of CsBr in this work is in good accord with the reference data 55.23% . But the solubility values of EuBr 3 are slightly lower than that from the literature with EuBr 3 of 64.70% .…”

Section: Resultsmentioning

confidence: 99%

(Solid + Liquid) Phase Equilibria for the Systems CsBr + EuBr₃ + H₂O and CsBr + EuBr₃ + HBr (∼12.3%) + H₂O at 298.15 K and Atmospheric Pressure and Thermodynamic and Fluorescent Properties of the New Solid-Phase Compound

Qiao

Dang

et al. 2016

J. Chem. Eng. Data

View full text Add to dashboard Cite

In this study, the (solid + liquid) phase equilibria for the two systems of CsBr + EuBr3 + H2O and CsBr + EuBr3 + HBr (∼12.3%) + H2O at 298.15 K and atmospheric pressure were determined by isothermal solubility method. Schreinemaker wet residue approach was used to determin the solid phases obtained from the studied systems. The related phase diagrams were depicted based upon the experimental data. There were two invariant points, three invariant curves, and three crystallization fields corresponding to CsBr, 5CsBr·2EuBr3·20H2O, and EuBr3·6H2O in the two phase diagrams. New double salt 5CsBr·2EuBr3·20H2O was incongruently soluble in the two systems. The content of EuBr3 in two invariant points decreased as the concentration of HBr in equilibrium liquid phase increased, while that of CsBr changed a little. The new solid-phase compound 5CsBr·2EuBr3·20H2O was investigated using chemical, XRD, and TG-DTG analyses. Additionally, the standard molar enthalpy of solution for 5CsBr·2EuBr3·20H2O in water was confirmed to be 104.69 ± 0.88 kJ/mol by microcalorimetry; its standard molar enthalpy of formation was determined as being −(9659.7 ± 1.6) kJ/mol. The fluorescence excitation and emission spectra of 5CsBr·2EuBr3·20H2O were acquired. The results indicate that upconversion spectra of 5CsBr·2EuBr3·20H2O exhibited pure green upconversion luminescence under 785 nm excitation.

show abstract

Section: Resultsmentioning

confidence: 99%

(Solid + Liquid) Phase Equilibria for the Systems CsBr + EuBr₃ + H₂O and CsBr + EuBr₃ + HBr (∼12.3%) + H₂O at 298.15 K and Atmospheric Pressure and Thermodynamic and Fluorescent Properties of the New Solid-Phase Compound

Qiao

Dang

et al. 2016

J. Chem. Eng. Data

View full text Add to dashboard Cite

show abstract

“…Isopiestic vapor pressure measurements have been reported for Mg(NO 3 ) 2 (aq) at 298.15 K 18-26 and at (273.1 5 and 323.1 5 ) K . These studies and other published thermodynamic studies involving Mg(NO 3 ) 2 (aq) are summarized in Table .…”

Section: Analysis Of Published Isopiestic Data and Direct Vapor Press...mentioning

confidence: 93%

“…Chernykh et al did not report the equilibrium molalities of their LiCl(aq) and H 2 SO 4 (aq) isopiestic reference standards, and Yakimov and Guzhavina 21 neither identified the reference standard or standards used nor reported their molalities. In these two studies, the isopiestic results were reported only as derived values of the water activities or vapor pressures, respectively, as a function of the Mg(NO 3 ) 2 (aq) solution composition.…”

Section: Analysis Of Published Isopiestic Data and Direct Vapor Press...mentioning

confidence: 99%

“…Five other electrolytes, MgCl 2 (aq), Ca(NO 3 ) 2 (aq), Mg(ClO 4 ) 2 (aq), LiCl(aq), and KNO 3 (aq), were used as nontraditional reference standards in some of the published isopiestic studies of Mg(NO 3 ) 2 (aq) described three paragraphs above. ,− There are relatively few thermodynamic studies for KNO 3 (aq) and Mg(ClO 4 ) 2 (aq) that determine their osmotic coefficients, and thus we do not believe that they are sufficiently well characterized at present to serve as isopiestic reference standards. Therefore, we do not reanalyze isopiestic measurements involving these electrolytes. − There is a fairly recent critical review of the thermodynamic properties of Ca(NO 3 ) 2 (aq), but the authors did not discuss the uncertainty of the osmotic coefficients predicted by their model, which probably have significantly larger uncertainties than those of the four traditional standards.…”

Section: Analysis Of Published Isopiestic Data and Direct Vapor Press...mentioning

confidence: 99%

“…We searched the published literature and located 10 articles that reported isopiestic vapor pressure measurements for Mg(NO 3 ) 2 (aq), − several studies that reported the results from direct water vapor pressure measurements, − and four studies reporting freezing temperature measurements. − There are also three published studies that report enthalpies of dilution or relative apparent molar enthalpies of Mg(NO 3 ) 2 (aq), ,, two determinations of the enthalpy of solution of Mg(NO 3 ) 2 ·6H 2 O(cr) at 298.15 K, , and two determinations of the heat capacities of Mg(NO 3 ) 2 (aq). , Although not all of these published studies are reliable, enough reliable data are available to permit the parametrization of the standard Pitzer ion-interaction model 12-14 at 298.15 K to much higher molalities than done previously and to evaluate the parameters of the extended ion-interaction model of Archer. , Our critical analysis of the thermodynamic properties of Mg(NO 3 ) 2 (aq) and evaluation of the ion-interaction model parameters are described below. We found that when the exponential coefficient was fixed at α 1 = 1.55 kg 1/2 ·mol -1/2 , both Pitzer's and Archer's models give excellent and nearly equivalent representations of the available osmotic coefficients.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Review of the Thermodynamic Properties of Mg(NO₃)₂(aq) and Their Representation with the Standard and Extended Ion-Interaction (Pitzer) Models at 298.15 K

2004

View full text Add to dashboard Cite

Published thermodynamic data yielding the osmotic coefficients, relative apparent molar enthalpies, and apparent molar heat capacities of Mg(NO3)2(aq) have been collected, recalculated consistently, and critically assessed. The more reliable of these data have been used to evaluate the parameters of the standard three-parameter form of Pitzer's ion-interaction model to higher molalities than previously available, along with the parameters of Archer's four-parameter, extended ion-interaction model at 298.15 K. Published experimental thermodynamic data were essentially represented equally well by these two models, provided that the exponential coefficient α1 of the standard Pitzer model is fixed at the optimum value of α1 = 1.55 kg1/2·mol-1/2 rather than the traditional value of α1 = 2.0 kg1/2·mol-1/2. The use of the standard Pitzer model with this modified α1 value is recommended for Mg(NO3)2(aq). In addition, an empirical equation is given for the variation of the water activity of a saturated solution with temperature, from 273.54 to 328.20 K, with Mg(NO3)2·6H2O(s) as the solid phase.

show abstract

Vibrational spectroscopic and force field studies of copper(II) chloride and bromide compounds, and crystal structure of KCuBr₃

Stepakova

Skripkin

Chernykh

et al. 2007

J Raman Spectroscopy

Self Cite

View full text Add to dashboard Cite

Vibrational spectroscopic and force field studies have been performed of 15 related copper(II) chloride and copper(II) bromide compounds, including hydrated salts crystallizing in ternary aqueous systems with alkali and ammonium halides. For halocuprates with distorted octahedral coordination characteristic stretching Raman wavenumbers, corresponding to symmetric stretching Cu II -X modes in the equatorial plane, were found in the ranges 247-288 cm −1 for X = Cl, and 173-189 cm −1 for X = Br, while the low-wavenumber stretching modes for the weaker axial Cu-X interactions varied considerably. The tetrahedral coordination for Cs 2 CuCl 4 and Cs 2 CuBr 4 leads to somewhat lower Cu-X symmetric stretching wavenumbers, 295 and 173 cm −1 , respectively. The assignments of the copper-ligand stretching vibrations were performed with the aid of normal coordinate calculations. Correlations between force constants, averaged Cu-X stretching wavenumbers and bond distances have been evaluated considering the following aspects: (1) Jahn-Teller tetragonal distortion (axial elongation) of the octahedral copper(II) coordination environment, (2) differences between terminal and bridging halide ligands (3) effects of coordinated water and the influence of outer-sphere cations. Force constant ratios for terminal and bridging metal-halide bonds reveal characteristic differences between planar and tetrahedrally coordinated M 2 X 6 species. In the hydrated copper(II) halide complexes, the halide ligands are more strongly bound than coordinated water molecules. The crystal structure of KCuBr 3 (K 2 Cu 2 Br 6 ), which was determined to provide structural information for the force field analyses, contains stacks of planar dimeric [Cu 2 Br 6 ] 2− complexes held together by weak axial Cu-Br interactions.

show abstract

Solubility and Ionic Processes in the Cu X 2 ? MX ?H 2 O ( X ? =Cl ? , Br ? ; M + =Li + , Na + , K + , NH 4 + , Cs + ) Systems

Cited by 12 publications

References 0 publications

(Solid + Liquid) Phase Equilibria for the Systems CsBr + EuBr₃ + H₂O and CsBr + EuBr₃ + HBr (∼12.3%) + H₂O at 298.15 K and Atmospheric Pressure and Thermodynamic and Fluorescent Properties of the New Solid-Phase Compound

(Solid + Liquid) Phase Equilibria for the Systems CsBr + EuBr₃ + H₂O and CsBr + EuBr₃ + HBr (∼12.3%) + H₂O at 298.15 K and Atmospheric Pressure and Thermodynamic and Fluorescent Properties of the New Solid-Phase Compound

Review of the Thermodynamic Properties of Mg(NO₃)₂(aq) and Their Representation with the Standard and Extended Ion-Interaction (Pitzer) Models at 298.15 K

Vibrational spectroscopic and force field studies of copper(II) chloride and bromide compounds, and crystal structure of KCuBr₃

Contact Info

Product

Resources

About

Solubility and Ionic Processes in the Cu X 2 ? MX ?H 2 O ( X ? =Cl ? , Br ? ; M + =Li + , Na + , K + , NH 4 + , Cs + ) Systems

Cited by 12 publications

References 0 publications

(Solid + Liquid) Phase Equilibria for the Systems CsBr + EuBr3 + H2O and CsBr + EuBr3 + HBr (∼12.3%) + H2O at 298.15 K and Atmospheric Pressure and Thermodynamic and Fluorescent Properties of the New Solid-Phase Compound

(Solid + Liquid) Phase Equilibria for the Systems CsBr + EuBr3 + H2O and CsBr + EuBr3 + HBr (∼12.3%) + H2O at 298.15 K and Atmospheric Pressure and Thermodynamic and Fluorescent Properties of the New Solid-Phase Compound

Review of the Thermodynamic Properties of Mg(NO3)2(aq) and Their Representation with the Standard and Extended Ion-Interaction (Pitzer) Models at 298.15 K

Vibrational spectroscopic and force field studies of copper(II) chloride and bromide compounds, and crystal structure of KCuBr3

Contact Info

Product

Resources

About

(Solid + Liquid) Phase Equilibria for the Systems CsBr + EuBr₃ + H₂O and CsBr + EuBr₃ + HBr (∼12.3%) + H₂O at 298.15 K and Atmospheric Pressure and Thermodynamic and Fluorescent Properties of the New Solid-Phase Compound

(Solid + Liquid) Phase Equilibria for the Systems CsBr + EuBr₃ + H₂O and CsBr + EuBr₃ + HBr (∼12.3%) + H₂O at 298.15 K and Atmospheric Pressure and Thermodynamic and Fluorescent Properties of the New Solid-Phase Compound

Review of the Thermodynamic Properties of Mg(NO₃)₂(aq) and Their Representation with the Standard and Extended Ion-Interaction (Pitzer) Models at 298.15 K

Vibrational spectroscopic and force field studies of copper(II) chloride and bromide compounds, and crystal structure of KCuBr₃