Crystal and molecular structure of 2-aminopyridinium- 4-hydroxybenzenosulfonate—IR and Raman spectra, DFT calculations and physicochemical properties

2008 ◽  
Vol 39 (5) ◽  
pp. 569-581 ◽  
Author(s):  
J. Lorenc ◽  
I. Bryndal ◽  
M. Marchewka ◽  
W. Sasiadek ◽  
T. Lis ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Dft Calculations ◽  
Physicochemical Properties ◽  
Raman Spectra ◽  
Crystal And Molecular Structure ◽  
Ir And Raman Spectra ◽  
Ir And Raman

The crystal and molecular structure of scandium formate

1990 ◽  
Vol 55 (2) ◽  
pp. 426-434 ◽  
Author(s):  
Jindřich Hašek ◽  
Jan Ondráček ◽  
Pavel Karen ◽  
Jaroslav Bauer
Keyword(s):  
Molecular Structure ◽  
Hydrogen Bond ◽  
Raman Spectra ◽  
Crystal And Molecular Structure ◽  
Three Dimensional ◽  
Ir And Raman Spectra ◽  
Octahedral Coordination ◽  
Monoclinic System ◽  
Space Group ◽  
Ir And Raman

The structure of Sc(HCOO)3 was refined up to R = 0.046. The substance crystallizes in the monoclinic system, space group P21/c, a = 10.340(2), b = 6.631(1), c = 9.027(2) Å, β = 98.11(2)°, Z = 4. Scandium atoms are placed in the two symmetrically non-equivalent centres of symmetry thus forming alternating layers parallel to the plane of b,c. All formate oxygens are coordinated to Sc atoms thus forming a three-dimensional net with octahedral coordination of both independent Sc atoms. C-H bonds are oriented in between the nearest oxygens of neighbouring formate groups, but only one contact is sufficiently short to be denoted as the C-H···O hydrogen bond. IR and Raman spectra seem to confirm the differences between formate anions.

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

DFT calculations of the IR and Raman spectra of anthraquinone dyes and lakes

2018 ◽  
Vol 49 (4) ◽  
pp. 668-683 ◽  
Author(s):  
Marco Pagliai ◽  
Iacopo Osticioli ◽  
Austin Nevin ◽  
Salvatore Siano ◽  
Gianni Cardini ◽  
...  
Keyword(s):  
Dft Calculations ◽  
Raman Spectra ◽  
Ir And Raman Spectra ◽  
Anthraquinone Dyes ◽  
Ir And Raman
Sign in / Sign up

Export Citation Format

Share Document