Influence of the microsolvation on hemibonded and protonated hydrogen sulfide: infrared spectroscopy of [(H2S)n(X)1]+ and H+(H2S)n(X)1 (n = 1 and 2, X = water, methanol, and ethanol)

2019 ◽  
Vol 21 (29) ◽  
pp. 16064-16074 ◽  
Author(s):  
Keigo Hattori ◽  
Dandan Wang ◽  
Asuka Fujii
Keyword(s):  
Hydrogen Sulfide ◽  
Infrared Spectroscopy ◽  
Ir Spectroscopy

The microsolvation effect on the S∴S hemibond is studied by IR spectroscopy of model clusters of H2S, and the results are compared with the microsolvation of protonated H2S clusters.

First Nano-Infrared Spectroscopy and Imaging Measurements of Single Phospholipid Bilayers

2018 ◽  
Author(s):  
Adrian Cernescu ◽  
Michał Szuwarzyński ◽  
Urszula Kwolek ◽  
Karol Wolski ◽  
Paweł Wydro ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Ir Spectroscopy ◽  
Absorption Band ◽  
Spectral Region ◽  
Near Field ◽  
Phospholipid Bilayers ◽  
Model Systems ◽  
Absorption Bands ◽  
Protein Complement ◽  
20 Nm

<div><div>Scattering-mode Scanning Near-Field Optical Microscopy (sSNOM) allows one to obtain absorption spectra in the mid-IR region for samples as small as 20 nm in size. This configuration has made it possible to measure FTIR spectra of the protein complement of membranes. (Amenabar 2013) We now show that mid-IR sSNOM has the sensitivity required to measure spectra of phospholipids in individual bilayers in the spectral range 800 cm<sup>-1</sup>–1400 cm<sup>-1</sup>. We have observed the main absorption bands of the dipalmitoylphosphatidylcholine headgroups in this spectral region above noise level. We have also mapped the phosphate absorption band at 1070 cm<sup>-1</sup> simultaneously with the AFM topography. We have shown that we could achieve sufficient contrast to discriminate between single and multiple phospholipid bilayers and other structures, such as liposomes. This work opens the way to further research that uses nano-IR spectroscopy to describe the biochemistry of cell membranes and model systems.</div></div><div></div>

PHARMACEUTICAL FORMULATION MANUFACTURER DISCRIMINATION BY INFRARED SPECTROSCOPY AND PRINCIPAL COMPONENT ANALYSIS

2019 ◽  
pp. 7-15
Author(s):  
E.M. Basova ◽  
Yu.N. Litvinenko ◽  
N.А. Polotnyanko
Keyword(s):  
Principal Component Analysis ◽  
Infrared Spectroscopy ◽  
Ir Spectroscopy ◽  
Principal Component ◽  
Component Analysis ◽  
Active Pharmaceutical Ingredients ◽  
Pharmaceutical Ingredients ◽  
The Third ◽  
Chemometric Technique ◽  
Tablet Formulations

In the present work Fournier transform infrared (IR) spectroscopy in association with chemometric technique was employed to identify kind of tablet formulations containing paracetamol and/or caffeine as active pharmaceutical ingredients. 13 samples of 5 commercially available brand tablets of different manufacturers and batches were bayed in local pharmacies. IR spectra of samples were recorded in the range 600—4000 cm-1 and subjected to and principal component analysis (PCA) which allowed to clearly identify 5 clusters in the scores plot using the third and the second principal components, corresponding to the brands of tablets. For Paracetamol and Caffeine-sodium benzoate tablets the combination of IR spectroscopy and PCA was able to recognize the manufacturer on the basis of distance between samples in clusters in the PCA scores plot.

Ion speciation of lithium hexafluorophosphate in dimethyl carbonate solutions: an infrared spectroscopy study

2018 ◽  
Vol 20 (35) ◽  
pp. 22710-22718 ◽  
Author(s):  
Kristen D. Fulfer ◽  
Daniel G. Kuroda
Keyword(s):  
Infrared Spectroscopy ◽  
Ir Spectroscopy ◽  
Dimethyl Carbonate ◽  
Spectroscopy Study ◽  
Dft Computations ◽  
Carbonate Solutions ◽  
Lithium Hexafluorophosphate

The speciation of lithium hexafluorophosphate (LiPF6) in dimethyl carbonate as function of the concentration is studied via IR spectroscopy and DFT computations.

Application of far-infrared spectroscopy to the structural identification of protein materials

2018 ◽  
Vol 20 (17) ◽  
pp. 11643-11648 ◽  
Author(s):  
Yanchen Han ◽  
Shengjie Ling ◽  
Zeming Qi ◽  
Zhengzhong Shao ◽  
Xin Chen
Keyword(s):  
Infrared Spectroscopy ◽  
Ir Spectroscopy ◽  
Far Infrared ◽  
Structural Identification ◽  
Globular Proteins ◽  
Far Infrared Spectroscopy ◽  
Silk Fibroins

Far-IR spectroscopy was applied to monitor the structure of two types of silk fibroins and the results indicate that they both show several sharp characteristic peaks, which are totally different from those of globular proteins.

Structural Properties of High Electronic Quality a-Si1-xCx:H by Infrared Spectroscopy

1992 ◽  
Vol 258 ◽  
Author(s):  
K. Eberhardt ◽  
E. Lotter ◽  
M. Heintze ◽  
H.-D. Mohring ◽  
G.H. Bauer
Keyword(s):  
Infrared Spectroscopy ◽  
Ir Spectroscopy ◽  
Structural Properties ◽  
Hydrogen Content ◽  
Low Carbon ◽  
Absorption Data ◽  
Experimental Transmission ◽  
Wide Compositional Range ◽  
Ir Analysis ◽  
Thickness Independent

ABSTRACTInfrared (ir) spectroscopy is used to investigate the structural properties of a-SiC:H in a wide compositional range and as a function of film thickness. Hydrogen content NH increases considerably with increasing carbon fraction. For low carbon alloys this is mainly due to an increase of hydrogen bonded to silicon, incorporated in a mono- or dihydride form. Above Eg=2.3eV the proportion of hydrogen incorporated in C-H bonds increases considerably. Oxidation of high C alloys is observed. Converting experimental transmission exactly into absorption data yields thickness independent NH values. It is shown that the previously reported discrepancy between the hydrogen content calculated from ir and nuclear reaction techniques is an artifact of the ir analysis.

Structural Study of Lithium Strontium Borophosphate Crystal Using X-Ray Diffraction and Infrared Spectroscopy

2012 ◽  
Vol 501 ◽  
pp. 106-110 ◽  
Author(s):  
Poh Sum Wong ◽  
Wan Ming Hua ◽  
Tien Yew Eeu ◽  
Rosli Hussin ◽  
Zuhairi Ibrahim
Keyword(s):  
Heat Treatment ◽  
Infrared Spectroscopy ◽  
Ir Spectroscopy ◽  
Deionized Water ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sintering Time ◽  
Water As Solvent ◽  
Host Structure ◽  
Compositional Series

In order to study the influence of deionized water and heat treatment on the structure of the crystal, a compositional series of 20Li2O:20SrO:30B2O3:30P2O5 with deionized water and without de-ionized water as a solvent were prepared at 800ᵒC for different sintering time from 7 to 24 h. The crystalline phase and structural of 20Li2O:20SrO:30B2O3:A 30P2O5 crystal was studied using X-ray powder diffraction (XRD) and Infrared (IR) Spectroscopy. From the XRD result, samples prepared with deionized water as solvent displayed better crystalline respond. The samples showed a better crystalline structure when it was sintered for 24 h as compared to 7 h. The infrared spectra of the samples showed three distinctive regions around 1200 – 650 cm-1, 650 – 360 cm-1 and 360 cm-1 showing clear signs of boron units as the major host structure.

Applying CEAS method to UV, VIS, and IR spectroscopy sensors

2011 ◽  
Vol 59 (4) ◽  
pp. 415-418 ◽  
Author(s):  
J. Wojtas ◽  
J. Mikolajczyk ◽  
M. Nowakowski ◽  
B. Rutecka ◽  
R. Medrzycki ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Ir Spectroscopy ◽  
High Precision ◽  
Absorption Spectroscopy ◽  
Mid Infrared ◽  
Measure Concentration ◽  
Enhanced Absorption ◽  
Cavity Enhanced Absorption Spectroscopy ◽  
The Cost ◽  
Detection Of Explosives

Applying CEAS method to UV, VIS, and IR spectroscopy sensorsIn the paper, several applications of Cavity Enhanced Absorption Spectroscopy (CEAS) for trace mater detection are described. NO2sensor was constructed using this technique with blue-violet lasers (395-440 nm). The sensor sensitivity reaches the level of single ppb and it was applied in security portal. For detection of two gases at the same time, two-channel sensor was constructed. Used method allows a significant reduction in the cost of optoelectronic CEAS sensor designed to measure of concentrations of many gases simultaneously. Successful monitoring of N2O and NO in the air requires high precision mid-infrared spectroscopy. The constructed sensors are able to measure concentration at ppb level. These sensors might be used for monitoring of atmospheric purity as well as for detection of explosives.

scholarly journals Classification of Five Kinds of Moss Plants with the Use of Fourier Transform Infrared Spectroscopy and Chemometrics

2011 ◽  
Vol 25 (6) ◽  
pp. 271-285 ◽  
Author(s):  
Tao Hu ◽  
Wen-Ying Jin ◽  
Cun-Gui Cheng
Keyword(s):  
Cluster Analysis ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Ir Spectroscopy ◽  
Ir Spectra ◽  
Fourier Transform Infrared Spectroscopy ◽  
Moss Species ◽  
Ft Ir ◽  
And Cluster Analysis ◽  
Ft Ir Spectroscopy

Fourier transform infrared spectroscopy (FT-IR) with Horizontal Attenuated Total Reflectance (HATR) techniques is used to obtain the FT-IR spectra of five kinds of mosses, such asPtychomitrium dentatum(Mitt.) Jaeg.,Ptychomitrium polyphylloides(C. Muell.) Par.,Ptychomitrium sinense(Mitt.) Jaeg.,Macromitrium syntrichophyllumTher. Etp. Vard., andMacromitrium ferrieiCard. Sz Ther. Based on the comparison of the above mosses in the FT-IR spectra, the region ranging from 4000 to 650 cm−1was selected as the characteristic spectra for analysis. Principal component analysis (PCA) and cluster analysis are considered to identify the five moss species. Because they belong to the homogeneous plants, and have similar chemical components and close FT-IR spectroscopy, PCA and cluster analysis can only give a rough result of classification among the five moss species, Fourier self-deconvolution (FSD) and discrete wavelet transform (DWT) methods are used to enhance the differences between them. We use these methods for further study. Results show that it is an excellent method to use FT-IR spectroscopy combined with FSD and DWT to classify the different species in the same family. FT-IR spectroscopy combined with chemometrics, such as FSD and DWT, can be used as an effective tool in systematic research of bryophytes.

scholarly journals OXIDIZED MAIZE STARCH: CHARACTERIZATION AND EFFECT OF IT ON THE BIODEGRADABLE FILMS.II. INFRARED SPECTROSCOPY, SOLUBILITY OF OXIDIZED STARCH AND STARCH FILM SOLUBILITY

2017 ◽  
Vol 55 (4) ◽  
pp. 395 ◽  
Author(s):  
Phi Hung Dao ◽  
Trương Thị Nam ◽  
Mạc Van Phuc ◽  
Nguyen Anh Hiep ◽  
Trinh Van Thanh ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Ir Spectroscopy ◽  
Ir Spectra ◽  
Oxidation Process ◽  
Carboxyl Groups ◽  
Maize Starch ◽  
Production Characteristic ◽  
Oxidized Starch ◽  
Ft Ir ◽  
Oxidant Content

The effects of hypochlorite level, i.e. 0.5; 1 and 2 active chlorine g/100g starch, on the properties of oxidized maize starch were investigated by FT-IR and solubility of oxidized starch and starch film. The obtained results shown that there was no difference of IR spectroscopy graph between native starch and oxidized starch. Although the analytical results indicated that there were carbonyl and carboxyl production, characteristic vibrations of these groups exhibiting on IR spectra was not clear due to either not enough content of carbonyl and carboxyl groups or covering of strong other absorptions. Notwithstanding, IR spectra also shown the change of intensity of characteristic vibrations. Moreover, solubility of starch oxidized by the highest oxidant content level experienced highest degree while solubility of this starch shown the lowest level. It means that carboxyl in this molecule starch, to some extent, esterified with hydroxyl of either other starch molecules or glycerol to produce crosslink. The obtained results also illustrated that there was a little scission chain in oxidation process when modifying maize starch by sodium hypochlorite.

Sign in / Sign up

Export Citation Format

Share Document