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.

Protonation du N,N-diméthylformamide: étude par spectrométries vibrationnelle et électronique

1975 ◽  
Vol 53 (3) ◽  
pp. 442-447 ◽  
Author(s):  
P. Combelas ◽  
M. Costes ◽  
C. Garrigou-Lagrange
Keyword(s):  
Aqueous Solutions ◽  
Raman Spectra ◽  
Infrared And Raman Spectra ◽  
Protonation Equilibrium ◽  
Ionization Equilibria

Infrared and Raman spectra of acidic (hydrochloric or sulfuric) aqueous solutions of dimethylformamide indicate the existence of a single protonation equilibrium.[Formula: see text]The pK for this reaction was evaluated as −1.35 ± 0.05 from u.v. spectra; a less precise value (−1.1 ± 0.5) was obtained from Raman spectra. This result disagrees with earlier conclusions which favored the existence of two ionization equilibria for dimethylformamide. [Journal translation]

scholarly journals Molecular Species in Concentrated Aqueous Solutions of Cadmium Halides as Inferred from the Raman Spectra.

1979 ◽  
Vol 33a ◽  
pp. 11-13 ◽  
Author(s):  
Chr. Knakkergaard Møller ◽  
Kurt Nielsen ◽  
Terje Østvold ◽  
Arne Holm ◽  
Nils H. Toubro ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Raman Spectra ◽  
Molecular Species ◽  
Concentrated Aqueous Solutions

Low frequency vibrational spectra of lithium formate monohydrate and its aqueous solutions

1983 ◽  
Vol 61 (10) ◽  
pp. 2282-2284 ◽  
Author(s):  
A. Agarwal ◽  
D. P. Khandelwal ◽  
H. D. Bist
Keyword(s):  
Aqueous Solutions ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
Low Frequency ◽  
Far Infrared ◽  
Infrared And Raman Spectra ◽  
Tetrahedral Structure ◽  
Structure Of Water ◽  
Lithium Formate ◽  
Lithium Formate Monohydrate

The far infrared and Raman spectra of polyerystalline lithium formate monohydrate and the Rayleigh wing scattering of its aqueous solutions are reported. Three new bands in solid and bands due to librations of HCOO− and the quasi-tetrahedral structure of water in solutions have been identified.

Vibrational spectra of metal-nitro complexes. II. Substituted halo complexes of platinum(IV)

1973 ◽  
Vol 26 (7) ◽  
pp. 1413 ◽  
Author(s):  
MJ Nolan ◽  
DW James
Keyword(s):  
Raman Spectra ◽  
Point Group ◽  
Factor Group ◽  
Group Symmetry ◽  
Infrared And Raman Spectra ◽  
Point Group Symmetry ◽  
Nitro Complexes ◽  
Site Group ◽  
Group Symmetries ◽  
Complex Ion

The infrared and Raman spectra of compounds forming the series given by [Pt(NO2)6-nCln]2- (n = 0-5) together with some of the analogous bromo and iodo compounds have been obtained. Most compounds were studied in the solid state, but the Raman spectra of solutions of some of the compounds were also obtained. The spectra were interpreted initially by considering the likely point group symmetry of the complex ion. Where details of the crystal structures were known, the site group and factor group symmetries were also considered.

Raman spectra of rnercury(II) nitrate in aqueous solution and as the crystalline hydrate

1969 ◽  
Vol 22 (2) ◽  
pp. 337 ◽  
Author(s):  
RPJ Cooney ◽  
JR Hall
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Bonding ◽  
Aqueous Solutions ◽  
Crystal Lattice ◽  
Raman Spectra ◽  
Raman Line ◽  
Covalent Bond ◽  
Crystalline Hydrate ◽  
Concentrated Aqueous Solutions ◽  
Mercury Nitrate

Raman spectra of mercury(II) nitrate in concentrated aqueous solutions (0.7-7.0M) indicate that the nitrate groups are present as associated ions or covalently bound groups. A gradual alteration in the appearance of the nitrate spectrum with increasing concentration is explained in terms of changes in the nature of mercury-nitrate interaction. A Raman line assignable to the stretching of a mercury-nitrate covalent bond has been observed at c. 270 cm-1. The spectrum of solid Hg(NO3)2,H2O differs from spectra of the aqueous solutions, mainly in the region 1300-1450 cm-1. Additional features are attributed to the influence of hydrogen bonding in the crystal lattice or to correlation field effects (anion-anion coupling).

scholarly journals Cadmium Removal from Aqueous Systems UsingOpuntia albicarpaL. Scheinvar as Biosorbent

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Rosa Icela Beltrán-Hernández ◽  
Gabriela Alejandra Vázquez-Rodríguez ◽  
Luis Felipe Juárez-Santillán ◽  
Ivan Martínez-Ugalde ◽  
Claudia Coronel-Olivares ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Functional Groups ◽  
Raman Spectra ◽  
Infrared And Raman Spectra ◽  
Aqueous Systems ◽  
Cadmium Removal ◽  
Ph Values ◽  
Natural Adsorbent ◽  
Low Concentrations ◽  
Heating Up

The aim of this research was to investigate the use of a natural adsorbent like nopal (Opuntia albicarpaL. Scheinvar) for removing cadmium from aqueous solutions with low concentrations of this metal. Two treatments were applied to the cladodes: a dehydration to get dehydrated nopal (DHN) and heating up to 90°C to obtain a thermally treated nopal (TN). After examining the effect of various pH values (2–7), the capacity of each biosorbent was examined in batch sorption tests at different dosages (0, 500, 1000, 1500, 2000, and 3000 mg L−1). The results indicated that adsorption of cadmium to biomass of DHN and TN was highly dependent on pH and biosorbent dosage. The best removal of cadmium (53.3%, corresponding toqeof 0.155 mg g−1) was obtained at pH 4.0 by using the TN sorbent. Infrared and Raman spectra confirmed that cadmium removal occurred via adsorption to –OH functional groups.

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