Raman Spectral Studies of Aqueous Solutions of Selenic Acid

1963 ◽  
Vol 39 (6) ◽  
pp. 1479-1492 ◽  
Author(s):  
G. E. Walrafen
Keyword(s):  
Aqueous Solutions ◽  
Spectral Studies ◽  
Selenic Acid ◽  
Raman Spectral

Raman Spectral Studies of Cadmium–Nitrite Interactions in Aqueous Solutions and Crystals

1975 ◽  
Vol 53 (10) ◽  
pp. 1414-1423 ◽  
Author(s):  
Donald E. Irish ◽  
Roderick V. Thorpe
Keyword(s):  
Aqueous Solutions ◽  
High Frequency ◽  
Deformation Mode ◽  
Formation Constants ◽  
Ratio Method ◽  
Spectral Studies ◽  
Nitrite Concentration ◽  
Nitrite Ion ◽  
Mole Ratio Method ◽  
Raman Spectral

Raman spectra of aqueous solutions containing Cd2+ and NO2− clearly reveal the presence of solvated nitrite ion and of complexes. A band at 861 cm−1 is characteristic of the latter. The free nitrite concentration was measured from the intensity of the 817 cm−1 line and the average ligand number was evaluated for solutions with composition prescribed by the mole-ratio method. Four cumulative formation constants were deduced: β1 = 61.6; β2 = 993; β3 = 2390; β4 = 1899. Evidence that nitrite chelates Cd2+ through the two oxygen atoms is presented. The diagnostic spectral evidence consists of a high intensity, high frequency deformation mode and low intensity N—O stretching Raman bands with frequencies almost identical to those of the solvated nitrite ion. Data are also presented for solid Cd(NO2)2 and Kx−2Cd(NO2)x(x = 3,4,5).

Vibrational Spectral Studies of Solutions at Elevated Temperatures and Pressures. III. A Furnace Assembly for Raman Spectral Studies to 300°C and 15 MPa

1982 ◽  
Vol 36 (2) ◽  
pp. 137-140 ◽  
Author(s):  
D. E. Irish ◽  
T. Jarv ◽  
C. I. Ratcliffe
Keyword(s):  
High Temperature ◽  
Aqueous Solutions ◽  
Elevated Temperatures ◽  
Chemical Processes ◽  
Spectral Studies ◽  
Raman Spectral

The design of a furnace assembly for maintaining aqueous solutions at temperatures up to 300°C and controlled pressures of up to 15 MPa is described. The apparatus is being used to monitor the chemical processes taking place in high-temperature aqueous solutions. Spectra of the Zn(NO3)2/H2O system and the HCl/H2O system are presented as examples.

Raman spectral studies of solutions of alkali metal perchlorates in dimethyl sulfoxide and water

1985 ◽  
Vol 63 (7) ◽  
pp. 1351-1356 ◽  
Author(s):  
M. I. S. Sastry ◽  
Surjit Singh
Keyword(s):  
Alkali Metal ◽  
Aqueous Solutions ◽  
Dimethyl Sulfoxide ◽  
Raman Spectra ◽  
Ion Pairs ◽  
Spectral Studies ◽  
Increase With Increase ◽  
Raman Spectral ◽  
Depolarization Ratios

Raman spectra of solutions of alkali metal perchlorates in dimethyl sulfoxide (DMSO) in the Cl—O, C—S, and S=O stretching regions, as well as of perchlorates in aqueous solutions in the Cl—O stretching region are reported. The results are discussed in terms of half-bandwidths, relative intensities, and depolarization ratios. For H2O the half-bandwidth of the Cl—O stretching band at ~935 cm−1 is almost double the value in DMSO solutions. Solutions of perchlorates in DMSO show two symmetric bands in the Cl—O stretching region, whereas in aqueous solutions only one band is observed. The half-bandwidths in perchlorate solutions in DMSO for the C—S stretching band increase with increase in concentration of perchlorate compared to that of liquid DMSO. The band contours in the S=O stretching region in DMSO solutions also show significant changes. These observations are explained on the basis of formation of ion pairs of metal perchlorates in solutions of DMSO and ion hydrates in the case of aqueous solutions.

Raman Spectral Studies of Oleums

1964 ◽  
Vol 40 (8) ◽  
pp. 2326-2341 ◽  
Author(s):  
George E. Walrafen
Keyword(s):  
Spectral Studies ◽  
Raman Spectral
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