Raman spectra of crystalline hydrolysis products of aqueous solutions of mercury(II) nitrate

1972 ◽  
Vol 25 (6) ◽  
pp. 1159 ◽  
Author(s):  
RPJ Cooney ◽  
JR Hall
Keyword(s):  
Raman Spectrum ◽  
Aqueous Solutions ◽  
Raman Spectra ◽  
Hydrolysis Products ◽  
Free Ion ◽  
Polymeric Compounds ◽  
Hydrolysis Of

Raman spectra of the crystalline polymeric compounds [HgOH]NO3, [Hg3O2](NO3)2, and [Hg3O2](NO3)2,H2O, obtained by hydrolysis of aqueous solutions of mercury(11) nitrate, are reported. For purposes of comparison with [HgOH]NO3, the Raman spectrum of polymeric [HgNH2]Cl is also recorded. The two most significant aspects of the Raman spectra of these hydrolysis products are the dependence of the frequency of the most intense Hg-O stretching mode on the number of mercury atoms bonded to a common oxygen in each compound and the appearance of the nitrate spectrum, which suggests in each case that the ion has symmetry lower than the free ion symmetry (D3h). The spectrum of the solution from which the compound [HgOH]NO3 is isolated is notable for the intensity of the Hg-ONO2 stretching mode and the magnitude of the splitting of the originally degenerate v3 frequency of the free ion.

Vibrational spectra of mercury(I) nitrate in aqueous solution and of the crystalline hydrolysis products

1978 ◽  
Vol 31 (12) ◽  
pp. 2601 ◽  
Author(s):  
K Tan ◽  
MJ Taylor
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
Hydrolysis Products ◽  
Mercurous Nitrate

Aqueous solutions of 'mercurous nitrate' are shown by Raman spectra to contain the complexes [Hg2(OH2)NO3]+ and [Hg2(OH2)2]2+. Crystalline dimercury(I) nitrate, Hg2(NO3)2,2H2O, and its solid hydrolysis products Hg2(OH)2,3Hg2(NO3)2, 2Hg2(OH)2,3Hg2(NO3)2,H2O and Hg2(OH)2,- Hg2(NO3)2 have been obtained: the vibrational spectra are reported and interpreted in terms of possible structures. Modes v(Hg-Hg) appear in the range 170- 200 cm-1 and are sensitive to the particular combination of the ligands OH, ONO2, and H2O attached to the dimercury(I) ion.

Ramanspektroskopische Untersuchungen an festen und in Wasser gelösten Polyboraten / Investigations of Solid Polyborates and their Aqueous Solutions by Raman Spectroscopy

1979 ◽  
Vol 34 (4) ◽  
pp. 585-590 ◽  
Author(s):  
Ralf Janda ◽  
Gert Heller
Keyword(s):  
Aqueous Solution ◽  
Raman Spectroscopy ◽  
Raman Spectrum ◽  
Aqueous Solutions ◽  
Raman Spectra ◽  
Solubility In Water

Abstract Raman spectra of solid H3BO3, Na2[B4O5(OH)4] · 8 H2O, K[B5O6(OH)4] · 2H2O and Na[B(OH)4] were recorded between 300 and 1500 cm-1 as well as of borax in aqueous solutions as a function of concentration and pH. Because of better solubility in water, the Raman spectrum of ammonium tetraborate in aqueous solution was also recorded as a function of pH. For comparisons the Raman spectra of solid (NH4)2[B4O5(OH)4] · 2 H2O, β-NH4[B5O6(OH)4] · 2 H2O, NH4[B5O6(OH)4] · 0,67 H2O and NH4[B5O6(OH)4] were considered. In solution, all lines in the Raman spectra could be assigned and the degree of depolarization measured. The assigned Raman frequencies can be used for the identification of unknown B-O-lines and therefore of unknown borate or polyborate structures.

THE WATER-SOLUBLE POLYSACCHARIDES OF DERMATOPHYTES: IV. GALACTOMANNANS I FROM TRICHOPHYTON GRANULOSUM, TRICHOPHYTON INTERDIGITALE, MICROSPORUM QUINCKEANUM, TRICHOPHYTON RUBRUM, AND TRICHOPHYTON SCHÖNLEINII

1965 ◽  
Vol 43 (1) ◽  
pp. 30-39 ◽  
Author(s):  
C. T. Bishop ◽  
M. B. Perry ◽  
F. Blank ◽  
F. P. Cooper
Keyword(s):  
Aqueous Solutions ◽  
Copper Complexes ◽  
Trichophyton Rubrum ◽  
Periodate Oxidation ◽  
Structural Features ◽  
Water Soluble ◽  
Major Constituent ◽  
Branch Points ◽  
Terminal Units ◽  
Hydrolysis Of

A group of polysaccharides, called galactomannans I, were precipitated as their insoluble copper complexes from aqueous solutions of the crude polysaccharides obtained from each of the organisms designated in the title. The five galactomannans I were homogeneous under conditions of electrophoresis and ultracentrifugation and had high positive specific rotations. The major constituent monosaccharide was D-mannose; amounts of D-galactose ranged from nil for the polysaccharide from T. rubrum to 13% for that from T. schönleinii. Methylation and hydrolysis of the five galactomannans I yielded varying amounts of the following: 2,3,5,6-tetra-O-methyl-D-galactose (not present in the products from T. rubrum), 2,3,4,6-tetra-O-methyl-D-mannose, 2,3,4-tri-O-methyl-D-mannose, 2,4,6-tri-O-methyl-D-mannose, 3,4-di-O-methyl-D-mannose, and 3,5-di-O-methyl-D-mannose. Periodate oxidation results agreed with the methylation studies. The gross structural features of each galactomannan I appear to be the same, namely, a basic chain of 1 → 6 linked α-D-mannopyranose units for approximately every 22 of which there is a 1 → 3 linked α-D-mannopyranose residue. Branch points occur along the 1 → 6 linked chain at the C2 positions of the D-mannopyranose units and once in every 45 units at the C2 position of a 1 → 6 linked D-mannofuranose residue. The D-galactose in the polysaccharides is present exclusively as non-reducing terminal furanose units; non-reducing terminal units of D-mannopyranose are also present. The variations in the identities and relative amounts of the non-reducing terminal units were the only apparent differences in the gross structural features within this group of polysaccharides.

The resonance Raman spectra and excitation profiles of some 4-sulfamylazobenzenes

1977 ◽  
Vol 55 (9) ◽  
pp. 1444-1453 ◽  
Author(s):  
Kamal Kumar ◽  
P. R. Carey
Keyword(s):  
Raman Spectrum ◽  
Raman Spectra ◽  
Resonance Raman ◽  
Valence Bond ◽  
Wavelength Dependence ◽  
Accurate Estimation ◽  
Intensity Changes ◽  
Stretching Vibration ◽  
Resonance Raman Spectra ◽  
Frequency Changes

The resonance Raman spectra of three pharmacologically important sulfonamides, 4-sulfamyl-4′-dimethylaminoazobenzene (1), 4-sulfamyl-4′-hydroxyazobenzene (2), and 4-sulfamyl-4′-aminoazobenzene (3), are compared with those of analogues lacking the sulfonamide group. The —SO2NH2 moiety does not directly contribute intense or moderately intense bands to the resonance Raman spectra of 1, 2, and 3. However, —SO2NH2 ionization is reflected by frequency changes in a band near 1140 cm−1 and intensity changes in the 1420 cm−1 region. The normal Raman spectrum of 2 confirms that the intensity changes reflect —SO2NH2 ionization rather than unrelated changes in vibronic coupling. The effect of —OH ionization on the resonance Raman spectrum of 2 emphasizes that caution must be exercised when relating spectral perturbations to changes in contributions from valence bond type structures. Resonance Raman excitation profiles for the 1138, 1387, and 1416 cm−1 bands of 2 show that these bands gain intensity by coupling with the electronic transitions in the 240 to 450 nm region and that, more than 1000 cm−1 to the red of λmax, the wavelength dependence can be closely reproduced by the FB type terms of Albrecht and Hutley. The excitation profile for each band shows evidence for structure in the 470 nm region, although lack of sufficient excitation wavelengths prevents accurate estimation of the spacing. Under conditions of rigorous resonance the intense Raman lines all occur in the 1400 cm−1 region, i.e. they are 'bunched' in the region known to contain the —N=N— stretching vibration.

Sulfoquinones in the hydrolysis of aryl esters of o- and p-hydroxyarenesulfonic acids in alkaline aqueous solutions of dioxane

1985 ◽  
Vol 50 (12) ◽  
pp. 2158-2165 ◽  
Author(s):  
Sergio Thea ◽  
Giorgio Cevasco ◽  
Giuseppe Guanti ◽  
Andrew Hopkins ◽  
Nasrin Kashefi-Naini ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Hydrolysis Of

Isoxazoles. VII: Hydrolysis of 4-Methyl- 5-isoxazolylnaphthoquinone Derivatives in Aqueous Solutions

1991 ◽  
Vol 80 (6) ◽  
pp. 573-577 ◽  
Author(s):  
Marcela R. Longhi ◽  
Maria M. de Bertorello ◽  
Margarita C. Brinón
Keyword(s):  
Aqueous Solutions ◽  
Hydrolysis Of
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