Infrared and Raman Spectroscopic Studies of Solid Alkali Metal Nitrites

1971 ◽  
Vol 49 (8) ◽  
pp. 1289-1295 ◽  
Author(s):  
M. H. Brooker ◽  
D. E. Irish
Keyword(s):  
Alkali Metal ◽  
Raman Spectra ◽  
Spectroscopic Studies ◽  
Infrared And Raman Spectra ◽  
Nitrite Ion ◽  
Nitrate Ion ◽  
Raman Spectroscopic ◽  
Linkage Isomerism ◽  
Vibrational Bands ◽  
Cation Size

Infrared and Raman spectra of solid LiNO2•H2O, LiNO2, NaNO2, KNO2, and CsNO2 are presented and discussed. Pronounced changes in the spectra of LiNO2•H2O during dehydration to anhydrous LiNO2 are interpreted as evidence for an ordered distribution of NO2− ions over two non-equivalent sites (akin to linkage isomerism) in anhydrous LiNO2. The frequencies of the internal modes of the nitrite ion shift to lower values with increasing cation size. Vibrational bands due to nitrate ion present as an impurity are assigned.

Vibrational frequency assignments of isotopically different forms of nitrate ion in ionic nitrate crystals

1970 ◽  
Vol 48 (8) ◽  
pp. 1198-1201 ◽  
Author(s):  
M. H. Brooker ◽  
D. E. Irish
Keyword(s):  
Raman Spectra ◽  
Vibrational Frequency ◽  
Isotopic Ratios ◽  
Infrared And Raman Spectra ◽  
Nitrate Ion ◽  
Low Intensity ◽  
Vibrational Bands

Infrared and Raman spectra of powdered ionic nitrates contain low intensity vibrational bands which are assigned to isotopically different species. Bands at ~(ν1 − 20) and ~ (ν4 − 13) cm−1 are assigned to the 14N16O218O− ion whereas the band at ~ (ν2 − 20) cm−1 is assigned to the 15N16O3− ion. Failure of the ratio of band intensities to agree with predicted isotopic ratios is discussed.

scholarly journals A Raman spectroscopic study of the natural carbonophosphates Na<sub>3</sub><i>M</i>CO<sub>3</sub>PO<sub>4</sub> (<i>M</i> is Mn, Fe, and Mg)

2021 ◽  
Vol 33 (3) ◽  
pp. 283-297
Author(s):  
Evgeniy Nikolaevich Kozlov ◽  
Ekaterina Nikolaevna Fomina ◽  
Vladimir Nikolaevich Bocharov ◽  
Mikhail Yurievich Sidorov ◽  
Natalia Sergeevna Vlasenko ◽  
...  
Keyword(s):  
Spectroscopic Study ◽  
General Formula ◽  
Raman Spectra ◽  
Crystallographic Orientation ◽  
Energy Dispersive ◽  
X Ray ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study ◽  
Vibrational Bands

Abstract. Raman spectra of three natural carbonophosphates (sidorenkite, bonshtedtite, and bradleyite) with the general formula Na3MCO3PO4 (M is Mn, Fe, and Mg) were studied and compared. These spectra showed from 21 to 24 vibrational bands, of which the two most intense (964±5 and 1074±3 cm−1) correspond to the υ1(P–O) and υ1(C–O) modes. These two bands split into doublet peaks due to the occurrence of isomorphic impurities. It was found that the crystallographic orientation of the sample influences the intensity of most bands. Most bands assigned to the same vibrations showed a regular shift (the smallest in sidorenkite spectra, an intermediate in bonshtedtite, and the largest in bradleyite). We propose an algorithm that allows for diagnostics of carbonophosphates in inclusions by their Raman spectra, providing a reliable result even in the absence of energy-dispersive X-ray spectroscopy (EDX) data.

Low frequency infrared and Raman spectra of the N,N,N′,N′-tetramethyl-ethylenediamine adducts of the Group IIb dihalides

1970 ◽  
Vol 48 (1) ◽  
pp. 181-184 ◽  
Author(s):  
M. H. Abraham ◽  
F. W. Parrett
Keyword(s):  
Solid State ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
Low Frequency ◽  
Infrared And Raman Spectra ◽  
Cadmium Complexes ◽  
Mercury Complexes ◽  
Vibrational Bands

A study of the low frequency vibrational spectra of the complexes MX2.TMED (where M = Zn, Cd, Hg; X = Cl, Br, I; TMED = N,N,N′,N′-tetramethylethylenediamine suggests that in the solid state the zinc and mercury complexes are 4-coordinated but the cadmium complexes are all based on octahedral halogen bridged structures. Assignments of the vibrational bands are discussed.

An infrared and Raman spectroscopic study of some Group 1B halide complexes containing an M4X4 core

1978 ◽  
Vol 31 (10) ◽  
pp. 2137 ◽  
Author(s):  
GA Bowmaker ◽  
RJ Knappstein ◽  
SF Tham
Keyword(s):  
Raman Spectra ◽  
Broad Band ◽  
Low Frequency ◽  
Far Infrared ◽  
Infrared And Raman Spectra ◽  
Intense Band ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study ◽  
Halide Complexes ◽  
Far Infrared Spectra

The infrared and Raman spectra of [Et3PcuI]4 and [Et3AsCuI]4 have been measured, and bands have been assigned to vibrations of the ligand and of the Td Cu4I4 core. The far-infrared spectra show two strong T2 v(CuI) bands at about 90 and 140 cm-1, the higher frequency member of which has a Raman counterpart which shows possible longitudinal-transverse splitting. The Raman spectra also show an intense band at about 50 cm-1. Similar features have been observed in the low-frequency vibrational spectra of [Et2S]3 [CuI]4, [C5H5NcuI]4, [C5H11NAgI]4, [Et3PAgBr]4 and [Et3PagCl]4, although the last two compounds gave only a single broad band in the v(MX) region.

Raman Spectroscopic Studies of the Vulcanization of Rubbers. III. Studies of Vulcanization Systems Based on 2-Mercaptobenzothiazole

1972 ◽  
Vol 45 (1) ◽  
pp. 173-181 ◽  
Author(s):  
M. M. Coleman ◽  
J. R. Shelton ◽  
J. L. Koenig
Keyword(s):  
Raman Spectra ◽  
Raman Line ◽  
Lauric Acid ◽  
Spectroscopic Studies ◽  
Type I ◽  
Raman Spectroscopic ◽  
Major Significance ◽  
Sulfur Vulcanization ◽  
Cyclic Sulfide

Abstract The shoulder observed at approximately 440 cm−1 in Raman spectra of CB vulcanizates prepared from MBT based vulcanizing systems has been shown to consist of two components. There are Raman lines contributing at 440 cm−1 and 424 cm−1. The former is due to ZnO present as an extra-network material while the latter appears to be associated with polysulfidic structures. The Raman line at 505 cm−1 seen in extracted vulcanizates prepared from CB-MBT-Sulfur-ZnO-Lauric acid recipes does not appear to be solely due to disulfidic structures. The major contribution appears to be associated with an unsaturated cyclic sulfide and is most probably due to a structure of the type (I). If the assignment to cyclic sulfidic structures such as (I) is confirmed, it will have major significance with regard to the mechanism of accelerated sulfur vulcanization.

Infrared and Raman spectra of the cerium(IV) ion – nitrate ion – water system

1967 ◽  
Vol 45 (2) ◽  
pp. 147-155 ◽  
Author(s):  
J. T. Miller ◽  
D. E. Irish
Keyword(s):  
Raman Spectra ◽  
Raman Band ◽  
Water System ◽  
Attenuated Total Reflectance ◽  
Infrared And Raman Spectra ◽  
Vibration Frequencies ◽  
Nitrate Ion ◽  
Total Reflectance ◽  
Infrared Transmittance ◽  
Concentration Changes

Infrared spectra of aqueous solutions containing Ce(IV) and nitrate ions have been obtained by the attenuated total reflectance (a.t.r.) technique. Vibration frequencies and intensities have been measured and compared with infrared transmittance spectra and Raman spectra of both solutions and solids. The number of bands and the variation of band intensity with concentration changes indicate the presence of nitrato–cerium complexes in the solution. The polarization of the 1 538 cm−1 Raman band is advanced as a criterion that the coordination between the nitrate ion and the cerium(IV) ion is bidentate. Possible assignments are considered although many of the vibrations are characteristic of the ligand and hence are not diagnostic of a particular species.

Raman spectroscopic studies of structural properties of solid and molten states of the magnesium chloride – alkali metal chloride system

1980 ◽  
Vol 58 (2) ◽  
pp. 168-179 ◽  
Author(s):  
M. H. Brooker ◽  
C.-H. Huang
Keyword(s):  
Phase Diagram ◽  
Raman Spectrum ◽  
Alkali Metal ◽  
Structural Properties ◽  
Magnesium Chloride ◽  
Spectroscopic Studies ◽  
Metal Chloride ◽  
Alkali Metal Chloride ◽  
Chloride System ◽  
Raman Spectroscopic

Raman spectra have been recorded for solids and melts of composition MgCl2 + nACl (n = 0–4 and A = Cs, Rb, K, Na, Li). Characteristic spectra have been observed for each of the solids predicted from phase diagram studies and an additional two compounds formulated as Rb3MgCl5 and K3MgCl5 were detected. The compounds Cs2MgCl4, Cs3MgCl5, and Rb3MgCl5 contain the discrete MgCl42− tetrahedral ion which has been characterized by its Raman spectrum. These compounds melt with retention of the MgCl42− ion. Most other solids appear to contain distorted network octahedra with face-, edge-, or corner-shared chlorides. These solids melt to give the more stable tetrahedral MgCl42− ion. In melts of high MgCl2 concentration a new peak was detected which appears to be characteristic of the dimeric Mg2Cl73− ion which exists in equilibrium with the MgCl42− ion. The results are compared to similar studies on the better characterized CsCl–AlCl3 system.

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