Application de la spectrométrie infrarouge et Raman à l'étude des complexes en solution aqueuse: Fe3+–H2C2O4

1980 ◽  
Vol 58 (12) ◽  
pp. 1220-1228 ◽  
Author(s):  
Mohsen Jaber ◽  
François Bertin ◽  
Germaine Thomas-David
Keyword(s):  
Aqueous Solution ◽  
Raman Spectra ◽  
Raman Effect ◽  
Raman Band ◽  
Ir And Raman Spectra ◽  
Raman Spectrometry ◽  
Exciting Line ◽  
Successive Formation ◽  
Ir And Raman ◽  
Solution Aqueuse

A study by Raman spectrometry of the System Fe3+–H2C2O4 in aqueous solution shows very clearly the successive formation of the three complexes: Fe(C2O4)+, Fe(C2O4)2−, Fe(C2O4)33−. Each species is characterised by a specific Raman spectrum.The evolution of Raman band intensities with the range of exciting line, and the comparison between ir and Raman spectra of Fe(III) and Al(III) complexes, show for Fe(III) species a pre-resonance Raman effect.

Application de la spectrométrie infrarouge, Raman et résonance magnétique nucléaire à l'étude des complexes en solution aqueuse. Al3+–H2C2O4

1977 ◽  
Vol 55 (21) ◽  
pp. 3689-3699 ◽  
Author(s):  
M. Jaber ◽  
F. Bertin ◽  
G. Thomas-David
Keyword(s):  
Aqueous Solution ◽  
Nmr Spectra ◽  
Raman Spectrometry ◽  
Characteristic Frequencies ◽  
Résonance Magnétique ◽  
Successive Formation ◽  
Characteristic Signal ◽  
Metal Ligand ◽  
C Nmr ◽  
Solution Aqueuse

A study by Raman spectrometry of the system Al3+–H2C2O4 in aqueous solution as a function of the acidity of the solution and of the ratio t = [metal]/[ligand] shows very clearly the successive formation of the complexes Al(C2O4)+, Al(C2O4)2−, and Al(C2O4)33−. The formation of the species Al(C2O4)+, which had been rejected by some authors, is confirmed and it was easily possible to identify its characteristic frequencies as well as those of the species Al(C2O4)2−. The 27Al and 13C nmr spectra confirm these results and allow the identification of each complex by means of a clearly characteristic signal. Moreover, the results of this study permit the rejection of the hypothesis of the formation of hydroxylated complexes, at least in important quantities.It also was possible to use the intensities of the Raman scattering bands at eight selected characteristic frequencies of the species Al(C2O4)+, Al(C2O4)2−, and Al(C2O4)33− to determine their distribution as a function of the acidity of the solution. [Journal translation]

scholarly journals Effect of addition of organic solvents on properties of the chemically synthesized polyaniline in aqueous solutions

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Shuangxi Xing ◽  
Shengyu Jing ◽  
Chun Zhao ◽  
Zichen Wang
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Raman Spectra ◽  
Organic Solvents ◽  
High Conductivity ◽  
Ir And Raman Spectra ◽  
Conductivity Measurements ◽  
Ft Ir ◽  
Ir And Raman

AbstractIn the process of polymerization of aniline in aqueous solution, different kinds or volumes of organic solvents were added. The effects of the organic solvents on the morphology, structure, conductivity and water-dispersity of the resulting polyaniline (PANI) were investigated with the aid of SEM, UV-Vis, FT-IR and Raman spectra and conductivity measurements. The results showed that the weak H-bond interactions between PANI and the solvents might play an important role in forming uniform nanofibers with relatively high conductivity and good waterdispersity. However, excessive addition of organic solvents led to the aggregation of the nanofibers and the corresponding PANI had a bad water-dispersity.

Molecular structure analysis of ascending aorta aneurysm upon atherosclerosis

2020 ◽  
Vol 41 (Supplement_2) ◽  
Author(s):  
I Mamarelis ◽  
V Mamareli ◽  
M Kyriakidou ◽  
O Tanis ◽  
C Mamareli ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Raman Spectra ◽  
Molecular Level ◽  
Ascending Aorta ◽  
Ir And Raman Spectra ◽  
Aggregate Formation ◽  
Aorta Aneurysm ◽  
Ft Ir ◽  
Molecular Structure Analysis ◽  
Ir And Raman

Abstract Background The atherosclerotic ascending aorta could represent a potential source of emboli or could be an indicator of atherosclerosis in general with high mortality. The mechanism of aneurysm formation and atherosclerosis of the ascending aorta at the molecular level has not yet been clarified. To approach the mechanism of ascending aortic lesions and mineralization at a molecular level, we used the non-destructive FT-IR, Raman spectroscopy, SEM and Hypermicroscope. Methods Six ascending aorta biopsies were obtained from patients who underwent aortic valve replacement (AVR) cardiac surgery. CytoViva (einst inc) hyperspectral microscope was used to obtain the images of ascending aorta. The samples were dissolved in hexane on a microscope glass plate. The FT-IR and Raman spectra were recorded with Nicolet 6700 thermoshintific and micro-Raman Reinshaw (785nm, 145 mwatt), respectively. The architecture of ascending aorta biopsies was obtained by using scanning electron microscope (SEM of Fei Co) without any coating. Results FT-IR and Raman spectra showed changes arising from the increasing of lipophilic environment and aggregate formation (Fig. 1). The band at 1744 cm–1 is attributed to aldehyde CHO mode due to oxidation of lipids. The shifts of the bands of the amide I and amide II bands to lower are associated with protein damage, in agreement with SEM data. The bands at about 1170–1000 cm–1 resulted from the C-O-C of advanced glycation products as result of connecting tissues fragmentations and polymerization. The spectroscopic data were analogous with the lesions observed with SEM and hypermicroscopic images. Conclusions The present innovate molecular structure analysis showed that upon ascending aorta aneurysm development an excess of lipophilic aggregate formation and protein lesions, changing the elasticity of the aorta's wall. The released Ca2+ interacted mostly with carbonate-terminal of cellular protein chains accelerated the ascending aorta calcifications. Figure 1. FT-IR and Raman spectra Funding Acknowledgement Type of funding source: None

Synthesis and Characterization of Tris(trimethyltin) Thiophosphate (Me3Sn)3PO3S

1993 ◽  
Vol 48 (12) ◽  
pp. 1781-1783 ◽  
Author(s):  
Abdel-Fattah Shihada
Keyword(s):  
Aqueous Medium ◽  
Raman Spectra ◽  
Mass Spectra ◽  
Ir And Raman Spectra ◽  
Synthesis And Characterization ◽  
Polymeric Structure ◽  
Ir And Raman

(Me3Sn)3PO3S has been prepared from the reaction of Me3SnCl with Na3PO3S • 12 H2O under cooling in aqueous medium. Its IR and Raman spectra are found to be consistent with a polymeric structure with tetra- and penta-coordinated tin atoms. The 31P NMR and mass spectra of (Me3Sn)3PO3S are reported and discussed.

IR AND RAMAN SPECTROSCOPIC INVESTIGATIONS OF Cr2O3-TeO2-B2O3-SrO GLASSES

2004 ◽  
Vol 18 (09) ◽  
pp. 367-373 ◽  
Author(s):  
I. ARDELEAN ◽  
N. MUREŞAN ◽  
P. PĂŞCUŢĂ
Keyword(s):  
Raman Spectra ◽  
Glass Network ◽  
Ir And Raman Spectra ◽  
Structural Units ◽  
Raman Spectroscopic ◽  
Chromium Ions ◽  
Spectroscopic Investigations ◽  
Ir And Raman

The Cr 2 O 3 content influence on the structure of 70 TeO 2·25 B 2 O 3·5 SrO glasses, was investigated by infrared and Raman spectroscopies. The results show that BO 3 and BO 4 are among the main structural units in the investigated glasses, together with TeO 3 and TeO 4 units. The presence of chromium ions located in the glass network is well evidenced in the IR and Raman spectra.

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