Raman spectra of concentrated solutions of magnesium and aluminium chloride in water and deuterium oxide

1990 ◽  
Vol 86 (3) ◽  
pp. 471 ◽  
Author(s):  
M. Alves Marques ◽  
M. A. Sousa Oliveira ◽  
J. Resina Rodrigues
Keyword(s):  
Raman Spectra ◽  
Deuterium Oxide ◽  
Aluminium Chloride ◽  
Concentrated Solutions

Vibrational Spectral Studies of Hexaquozinc Nitrate and Hexaquozinc Nitrate-d2

1971 ◽  
Vol 49 (9) ◽  
pp. 1510-1514 ◽  
Author(s):  
M. H. Brooker ◽  
D. E. Irish
Keyword(s):  
Aqueous Solutions ◽  
Raman Spectra ◽  
Deuterium Oxide ◽  
Ionic Association ◽  
Spectral Studies ◽  
Site Symmetry ◽  
Infrared And Raman Spectra ◽  
Concentrated Aqueous Solutions ◽  
Site Group ◽  
A Site

Infrared and Raman spectra are reported for the hexaquozinc nitrate crystal. Replacement of water by deuterium oxide causes a remarkable intensity reversal of components in the ν3 nitrate region and provides Raman spectra free from interference in the 2ν2 and ν4 regions. The nitrate spectrum is interpreted in terms of a site group approximation. The spectra are compared with those of concentrated aqueous solutions and partially dehydrated crystals to point up changes which result from a lowered site symmetry and those which result from ionic association.

THE RAMAN SPECTRUM OF THE SULPHURIC ACIDIUM ION: THE CONSTITUTION OF CONCENTRATED SOLUTIONS OF TETRA(HYDROGENSULPHATO)BORIC ACID IN SULPHURIC ACID

1962 ◽  
Vol 40 (4) ◽  
pp. 784-787 ◽  
Author(s):  
R. J. Gillespie ◽  
E. A. Robinson
Keyword(s):  
Raman Spectrum ◽  
Boric Acid ◽  
Sulphuric Acid ◽  
Raman Spectra ◽  
Acid Solutions ◽  
Concentrated Solutions

The Raman spectra of sulphuric acid solutions of tetra(hydrogensulphato)boric acid and its sodium and hydronium salts have been examined. Frequencies are assigned to some of the vibrations of the sulphuric acidium ion, H3SO4+, and are compared with the frequencies of the analogous vibrations of H2SO4 and HSO4−. Evidence is presented that elimination of disulphuric acid occurs between molecules of HB(HSO4)4 to give polymers containing B—O—B linkages.

Resolution of Raman spectra of aqueous sulfuric acid mixtures using principal factor analysis

1981 ◽  
Vol 59 (17) ◽  
pp. 2591-2598 ◽  
Author(s):  
Robin A. Cox ◽  
Ülo L. Haldna ◽  
K. Loralee Idler ◽  
Keith Yates
Keyword(s):  
Factor Analysis ◽  
Sulfuric Acid ◽  
Raman Spectra ◽  
Ion Pair ◽  
Medium Composition ◽  
Principal Factor ◽  
Water Molecules ◽  
Concentrated Solutions ◽  
Principal Factor Analysis ◽  
Hydrated Ion

Principal factor analysis has been applied to Raman spectra of 26 sulfuric acid/water mixtures covering the 0–100% H2SO4 concentration range. The analysis greatly facilitates the identification of peaks due to different species. The results show that SO42− ions and "free" HSO4− ions do not co-exist with undissociated H2SO4 molecules in solution and that two water molecules rather than one are required for the first ionization of H2SO4. A species with the composition H2SO4•2H2O, assigned a hydrated ion pair structure, reaches maximum concentration at the same medium composition at which SO42−, free HSO4−, and H2SO4 are at concentration minima, about 75% w/w. The only species apparent in the more concentrated solutions are the ion pair and undissociated H2SO4, which could be taken to mean that H2SO4 is a weaker acid than H3O+, but a stronger one than H3O+•H2O (or H5O2+, if this entity has a real existence). Separate peaks due to the postulated H3O+•H2SO4 (or H5SO5+) were not observed.

On the optimal conditions for the homogeneous nucleation of cubic ice from concentrated solutions of lithium chloride-deuterium oxide

1983 ◽  
Vol 87 (21) ◽  
pp. 4170-4173 ◽  
Author(s):  
A. Elarby-Aquizerat ◽  
J. F. Jal ◽  
C. Ferradou ◽  
J. Dupuy ◽  
P. Chieux ◽  
...  
Keyword(s):  
Lithium Chloride ◽  
Homogeneous Nucleation ◽  
Deuterium Oxide ◽  
Optimal Conditions ◽  
Concentrated Solutions

High-temperature infrared and Raman spectra of aluminium chloride dimer and monomer in the vapour phase

1983 ◽  
Vol 14 (6) ◽  
pp. 415-425 ◽  
Author(s):  
T. Tomita ◽  
C. E. Sjøgren ◽  
P. Klaeboe ◽  
G. N. Papatheodorou ◽  
E. Rytter
Keyword(s):  
High Temperature ◽  
Raman Spectra ◽  
Vapour Phase ◽  
Aluminium Chloride ◽  
Infrared And Raman Spectra

scholarly journals Study of electrolytic dissociation by the Raman effect. II.—Nitrates

1934 ◽  
Vol 144 (851) ◽  
pp. 159-165 ◽  
Keyword(s):  
Nitric Acid ◽  
Raman Spectra ◽  
Raman Effect ◽  
Quantitative Estimation ◽  
Conductivity Measurements ◽  
Concentrated Solutions ◽  
Degree Of Dissociation ◽  
Electrolytic Dissociation ◽  
Intensity Measurements ◽  
Number Of Factors

In the first part of these investigations by the author, the possibility of studying electrolytic dissociation by the Raman effect has been described with special reference to nitric acid. Accurate quantitative estimation has since been made of the degree of dissociation in the acid by measuring the intensities of Raman lines corresponding to the dissociated NO¯ 3 ions at various concentrations. The results thus obtained indicated that the dissociation in nitric acid is progressive between the concentrations 1-16 N and not complete as has been assumed for highly dilute solutions. A comparison of the values of the degree of dissociation obtained from this method with those calculated from conductivity measurements revealed a large discrepancy which was attributed to the uncertainty of the latter. The degree of dissociation cannot be directly evaluated from the values of electrolytic conductivity, which depend upon a number of factors such as viscosity of the solution, mobility of the ions, etc., as there is much uncertainty as to the dependence of conductivity on such factors. With Raman spectra, however, the number of molecules or ious is directly proportional to the intensity of the Raman lines corresponding to them. Hence a comparison of the number of molecules or ions at one concentration with that in another is made by simply comparing the intensities of the lines corresponding to them in the Raman spectra taken with the respective concentrations. The accuracy of the method is that attainable in the intensity measurements. Thus we have in this method a reliable means of measuring electrolytic dissociation, and another advantage is its applicability to concentrated solutions, for which at present no theory has been fully developed. In order to determine whether electrolytes are completely dissociated even in concentrated solutions, a systematic study of different electrolytes is being undertaken. The results for nitrates will be described in this communication.

Single Crystal Raman Spectra of the Phase Transition in KTCNQ

1982 ◽  
Vol 85 (1) ◽  
pp. 297-303 ◽  
Author(s):  
A. D. Bandrauk ◽  
K. D. Truong ◽  
S. Jandl
Keyword(s):  
Phase Transition ◽  
Single Crystal ◽  
Raman Spectra
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