A structural investigation of the singly layered silicates, silinaite and makatite, by vibrational spectroscopy

1999 ◽  
Vol 77 (4) ◽  
pp. 495-501 ◽  
Author(s):  
Yining Huang ◽  
Zhimei Jiang ◽  
Wilhelm Schwieger
Keyword(s):  
Raman Spectra ◽  
Vibrational Spectroscopy ◽  
Structural Investigation ◽  
Group Analysis ◽  
Factor Group ◽  
Layered Silicates ◽  
Ir And Raman Spectra ◽  
Vibrational Modes ◽  
Ir And Raman ◽  
Good Agreement

The IR and Raman spectra of two singly layered silicates, silinaite and makatite, have been investigated. The vibrational spectra were assigned based on previous studies of various silicates. The correlation between vibrational modes and the structural properties of silicates under investigation has been made. The IR and Raman spectra of silinaite are in good agreement with the known structure. However, the observed vibrational data of makatite are not completely consistent with those predicted by a factor group analysis based on the published single-crystal data.Key words: layered silicates, silinaite, makatite, vibrational spectroscopy.

A Highly Resolved Yibronic Spectra of Dioxido-p-terphenyl and Trioxido-p-quaterphenyl in n-Hexanc at 77 K

1982 ◽  
Vol 37 (1) ◽  
pp. 91-94
Author(s):  
A. Kawski ◽  
M. Ligȩza
Keyword(s):  
Raman Spectra ◽  
Ground State ◽  
Fluorescence Spectra ◽  
Vibrational Structure ◽  
Ir And Raman Spectra ◽  
Absorption And Fluorescence Spectra ◽  
Excited Singlet ◽  
Ir And Raman ◽  
Good Agreement

Abstract Highly resolved vibronic absorption and fluorescence spectra of dioxido-p-terphenyl and the fluorescence spec-trum of trioxido-p-quaterphenyl in n-hexane at 77 K were obtained. The analysis of the vibrational structure in the excited singlet Si and in the ground So state gives funda-mental frequencies in the ground state in good agreement with those from infrared (IR) and Raman spectra.

Darstellung und Charakterisierung von Dekachlorodiiridat(IV), [Ir2Cl10]2-, und Normalkoordinatenanalyse an Dioktaederkomplexen des Typs [M2X10]2-, M = Re, Os, Ir, Pt; X = Cl, Br / Preparation and Characterization of Decachlorodiiridate(IV), [Ir2Cl10]2-, and Normal Coordinate Analysis of Bioctahedral Complexes [M2X10]2-, M = Re, Os, Ir, Pt; X = Cl, Br

1992 ◽  
Vol 47 (8) ◽  
pp. 1115-1118 ◽  
Author(s):  
P. Hollmann ◽  
W. Preetz
Keyword(s):  
Raman Spectra ◽  
Point Group ◽  
Ir And Raman Spectra ◽  
Normal Coordinate ◽  
Bridging Ligands ◽  
Valence Force ◽  
Group D ◽  
Ir And Raman ◽  
Good Agreement

On heating the tetraethylammonium salt of [IrCl6]2- with trifluoroacetic acid the edge sharing bioctahedral anion [Ir2Cl10]2- is formed, the IR and Raman spectra of which are assigned according to point group D2h. Normal coordinate analyses, based on a general valence force field, for [M2X10]2-, M = Re, Os, Ir, Pt; X = Cl, Br have been performed, resulting in a good agreement of the calculated frequencies with the bands observed in the IR and Raman spectra. Due to the stronger bonding of the terminal as compared to the bridging ligands, the valence force constants fd(MXt) are significantly higher than fd(MXb).

Surface vibrational spectroscopy. A comparison of the EELS spectra of organic adsorbates at Pt(111) with IR and Raman spectra of the unadsorbed organics

1990 ◽  
Vol 141 (1) ◽  
pp. 21-39 ◽  
Author(s):  
Bruce E. Kahn ◽  
Scott A. Chaffins ◽  
John Y. Gui ◽  
Frank Lu ◽  
Donald A. Stern ◽  
...  
Keyword(s):  
Raman Spectra ◽  
Vibrational Spectroscopy ◽  
Ir And Raman Spectra ◽  
Organic Adsorbates ◽  
Ir And Raman

Diamond polytypes and their vibrational spectra

1990 ◽  
Vol 5 (11) ◽  
pp. 2277-2285 ◽  
Author(s):  
K. E. Spear ◽  
A. W. Phelps ◽  
W. B. White
Keyword(s):  
Silicon Carbide ◽  
Electron Diffraction ◽  
Group Analysis ◽  
Diamond Powder ◽  
Factor Group ◽  
Vibrational Modes ◽  
Crystal Electron ◽  
End Members ◽  
Zone Folding ◽  
Ir And Raman

A series of diamond polytype structures are described and their IR and Raman vibrational modes predicted. The diamond polytypes are analogous to the well-known silicon carbide polytypes. The intermediate 6H diamond polytype was recently identified by single crystal electron diffraction of vapor precipitated diamond powder. In addition, end member polytypes of 3C (cubic diamond) and 2H diamond (hexagonal lonsdaleite) have been previously established, and polytypes such as 4H, 8H, 15R, and 21R diamond are predicted, but may be difficult to isolate and identify. The various diamond polytype structures differ only in the stacking sequences of identical puckered hexagonal carbon layers. These identical carbon layers lie parallel to the cubic 3C {111} and the hexagonal 2H {001} planes. A new method for uniquely labeling the structural layers in the polytype stacking sequences is presented. Factor group analysis was used to determine the IR and Raman selection rules for five diamond polytypes with structures intermediate between those of end members diamond and lonsdaleite. Brillouin zone folding techniques were used to determine band positions, in analogy with analyses of SiC polytypes discussed in the literature. The results predict that (i) all diamond polytypes are Raman active, (ii) limiting polytypes 3C and 2H are not IR active, and (iii) polytypes 4H, 6H, 8H, 15R, and 21R have IR active modes.

MO-theoretische Behandlung des F5SO--Ions und der korrespondierenden Saure F5SOH / The F5SO--Ion and the Corresponding Acid F5SOH

1973 ◽  
Vol 28 (9) ◽  
pp. 1537-1538 ◽  
Author(s):  
Bernd M. Rode
Keyword(s):  
Raman Spectra ◽  
Experimental Results ◽  
Ir And Raman Spectra ◽  
Mo Calculations ◽  
Related Compounds ◽  
Ir And Raman ◽  
Good Agreement

The bonding in the F5SO--ion is discussed by comparing the results of CNDO MO calculations on this and some related compounds with data obtained from IR- and RAMAN-spectra. Theoretical and experimental results are found to be in good agreement. The-yet not prepared -acid F5SOH is discussed with respect to its stabilization and acidity.

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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