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.

scholarly journals The chemistry of stalked barnacle adhesive ( Lepas anatifera )

2015 ◽  
Vol 5 (1) ◽  
pp. 20140062 ◽  
Author(s):  
Jaimie-Leigh Jonker ◽  
Liam Morrison ◽  
Edward P. Lynch ◽  
Ingo Grunwald ◽  
Janek von Byern ◽  
...  
Keyword(s):  
Raman Spectra ◽  
Energy Dispersive Spectrometry ◽  
Attenuated Total Reflectance ◽  
Disulfide Bridges ◽  
Raman Analysis ◽  
Total Reflectance ◽  
Metal Interactions ◽  
Barnacle Species ◽  
Weak Evidence ◽  
Scanning Electron

The results of the first chemical analysis of the adhesive of Lepas anatifera , a stalked barnacle, are presented. A variety of elements were identified in scanning electron microscopy with energy dispersive spectrometry (SEM-EDS) of the adhesive, including Na, Mg, Ca, Cl, S, Al, Si, K and Fe; however, protein–metal interactions were not detected in Raman spectra of the adhesive. Elemental signatures from SEM-EDS of L. anatifera adhesive glands were less varied. Phosphorous was mostly absent in adhesive samples; supporting previous studies showing that phosphoserines do not play a significant role in adult barnacle adhesion. Disulfide bridges arising from Cys dimers were also investigated; Raman analysis showed weak evidence for S–S bonds in L. anatifera . In addition, there was no calcium carbonate signal in the attenuated total reflectance Fourier transform infrared spectra of L. anatifera adhesive, unlike several previous studies in other barnacle species. Significant differences were observed between the Raman spectra of L. anatifera and Balanus crenatus ; these and a range of Raman peaks in the L. anatifera adhesive are discussed. Polysaccharide was detected in L. anatifera adhesive but the significance of this awaits further experiments. The results demonstrate some of the diversity within barnacle species in the chemistry of their adhesives.

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.

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.

CHARACTERISTIC VIBRATIONS OF THE SULPHURYL GROUP

1961 ◽  
Vol 39 (1) ◽  
pp. 247-255 ◽  
Author(s):  
E. A. Robinson
Keyword(s):  
Linear Relationship ◽  
Raman Spectra ◽  
Infrared And Raman Spectra ◽  
Vibration Frequencies

A compilation of the S—O symmetric and asymmetric stretching frequencies is given for a large number of compounds containing an —SO2— group. It is shown that a linear relationship between [Formula: see text] is valid for a large number of sulphuryl and polysulphuryl compounds and that the actual frequencies depend in a systematic manner on the electronegativities of the attached groups. These relationships have proved very useful in assigning and in some cases reassigning the S—O bands in the infrared and Raman spectra of a number of sulphuryl compounds. It is pointed out that there is a relationship between the SO2 frequencies of some sulphonic acids and their acid strengths.The calculation of values for group electronegativities from the vibration frequencies of the P=O and SO2 groups is discussed.

Notizen: Schwingungseigenschaften des Nitrat-Ions im Ba10(ReO5)6(NO3)2-Apatit/Vibrational Properties of the Nitrate Ion in the Ba10(ReO5)6(NO3)2-Apatite

1983 ◽  
Vol 38 (4) ◽  
pp. 526-527 ◽  
Author(s):  
E. J. Baran ◽  
M. Aneas ◽  
J.-P. Besse
Keyword(s):  
Raman Spectra ◽  
Vibrational Properties ◽  
Infrared And Raman Spectra ◽  
Nitrate Ion

Abstract The infrared and Raman spectra of the crystalline Ba10(ReO5)6(NO3)2 apatite are reported and the vibrational properties of the NO3-ion present in this lattice are discussed in detail.

INFRARED AND RAMAN SPECTRA OF TETRABROMOETHYLENE

1953 ◽  
Vol 31 (12) ◽  
pp. 1223-1228 ◽  
Author(s):  
F. E. Malherbe ◽  
G. Allen ◽  
H. J. Bernstein
Keyword(s):  
Raman Spectrum ◽  
Infrared Spectrum ◽  
Raman Spectra ◽  
Liquid State ◽  
Potential Functions ◽  
Infrared And Raman Spectra ◽  
Vibration Frequencies

The infrared spectrum of liquid and dissolved tetrabromoethylene has been investigated from 3µ–36µ. The Raman spectrum has been obtained photographically in the liquid state and photoelectrically in solution and depolarizations measured. All of the fundamentals were observed except v4, v7, v10, and v12. The last two vibration frequencies are estimated by calculations from two different potential functions.

The Utilization of Ftir (Fourier Transform Infra-Red) Method Combined with Chemometrics For Authentication of Indonesian Coffee Powder

2017 ◽  
Vol 9 (3) ◽  
Author(s):  
Firmansyah A. ◽  
Winingsih W. ◽  
Soebara Y S
Keyword(s):  
Fourier Transform ◽  
Natural Product ◽  
High Performance ◽  
Principal Component ◽  
Raw Material ◽  
Attenuated Total Reflectance ◽  
Coffee Bean ◽  
Product Analysis ◽  
Total Reflectance ◽  
And Cluster Analysis

Analysis of natural product remain challenging issues for analytical chemist, since natural products are complicated system of mixture. The most popular methods of choice used for quality control of raw material and finished product are high performance liquid chromatography (HPLC), gas chromatography (GC) and mass spectrometry (MS). The utilization of FTIR-ATR (Fourier Transform Infrared-Attenuated Total Reflectance) method in natural product analysis is still limited. This study attempts to expand the use of FTIR spectroscopy in authenticating Indonesian coffee powder.The coffee samples studied were taken from nine regions in Indonesia, namely Aceh Gayo, Flores, Kintamani, Mandheling, Papua, Sidikalang, Toraja, Kerinci and Lampung.The samples in the form of coffee bean from various regions were powdered . The next step conducted was to determine the spectrum using the FTIR-ATR (Attenuated Total Reflectance) using ZnSe crystal of 8000 resolution. Spectrum samples, then, were analyzed using chemometrics. The utilized chemometric model was the principal component analysis (PCA) and cluster analysis (CA). Based on the chemometric analysis, there are similarities between Aceh Gayo coffee with Toraja coffee, Mandailing coffee, Kintamani coffee and Flores coffee. Sidikalang coffee has a similarity to Flores coffee; Papua coffee has a similarity to Sidikalang coffee; Lampung coffee has a similarity to Sidikalang coffee, while Kerinci coffee has a similarity to Papua coffee.

Quality evaluation of tugaksheeree samples by ATR-FTIR spectroscopy using multicomponent analysis

2020 ◽  
Vol 10 ◽  
Author(s):  
Nikunj D. Patel ◽  
Niranjan S. Kanaki
Keyword(s):  
Principal Component Analysis ◽  
Cluster Analysis ◽  
Quality Evaluation ◽  
Principal Component ◽  
Hierarchical Cluster ◽  
Attenuated Total Reflectance ◽  
Chemometric Methods ◽  
Total Reflectance ◽  
Fingerprint Region ◽  
Ftir Technique

Background: Numerous Ayurvedic formulations contains tugaksheeree as key ingredient. Tugaksheereeis the starch gained from the rhizomes of two plants, Curcuma angustifoliaRoxb. (Zingiberaceae) and Marantaarundinacea (MA) Linn. (Marantaceae). Objective: The primary concerns in quality assessment of Tugaksheeree occur due to adulteration or substitution. Method: In current study, Fourier transform infrared (FTIR) technique with attenuated total reflectance (ATR) facility was used to evaluate tugaksheeree samples. Total 10 different samples were studied and transmittance mode was kept to record the spectra devoid of pellets of KBR. Further treatment was given with multi component tools by considering fingerprint region of the spectra. Multivariate analysis was performed by various chemometric methods. Result: Multi component methods like Principal Component Analysis (PCA), and Hierarchical Cluster Analysis (HCA)were used to discriminate the tugaksheeree samples using Minitab software. Conclusion: This method can be used as a tool to differentiate samples of tugaksheeree from its adulterants and substitutes.

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