scholarly journals Impact of the long chain ω-acylceramides on the stratum corneum lipid nanostructure. Part 1: Thermotropic phase behaviour of CER[EOS] and CER[EOP] studied using X-ray powder diffraction and FT-Raman spectroscopy

2010 ◽  
Vol 163 (1) ◽  
pp. 42-50 ◽  
Author(s):  
Doreen Kessner ◽  
Gerald Brezesinski ◽  
Sergio S. Funari ◽  
Bodo Dobner ◽  
Reinhard H.H. Neubert
Keyword(s):  
Raman Spectroscopy ◽  
Stratum Corneum ◽  
Powder Diffraction ◽  
Phase Behaviour ◽  
X Ray ◽  
Stratum Corneum Lipid ◽  
Ft Raman Spectroscopy ◽  
Long Chain ◽  
Ft Raman

scholarly journals The preparation and characterization of SeCl3SbF6, improved syntheses of MCl3(As/Sb)F6 (M = S, Se), and the X-ray crystal structure determination of SeCl3AsF6 and a new phase of SBr3SbF6

1996 ◽  
Vol 74 (9) ◽  
pp. 1671-1681 ◽  
Author(s):  
Jack Passmore ◽  
Paul D. Boyle ◽  
Gabriele Schatte ◽  
Todd Way ◽  
T. Stanley Cameron
Keyword(s):  
Crystal Structure ◽  
Raman Spectroscopy ◽  
Crystal Structures ◽  
Monoclinic Space Group ◽  
X Ray ◽  
Ft Raman Spectroscopy ◽  
New Phase ◽  
Ft Raman

Alternative and, in some cases, improved syntheses of the salts MX3(As/Sb)F6 (M = S, Se) and SCl3(SbCl6/AlCl4) are described. In addition, the synthesis of SeCl3SbF6 is reported. The compounds were characterized by FT–Raman spectroscopy and the X-ray crystal structures of SeCl3AsF6 (also 77Se NMR) and a new phase of SBr3SbF6 were determined. Crystals of SeCl3AsF6 and SBr3SbF6 are monoclinic, space group P21/c with [values for SBr3SbF6 in brackets] a = 7.678(1) [8.137(1)] Å, b = 9.380(3) [9.583(2)] Å, c = 11.920(3) [12.447(2)] Å, β = 98.19(2)° [97.36(1)]°, V = 849.72(3) [962.6(3)] Å3,z = 4, Dx = 2.925 [3.502] Mg m−3, R = 0.0525 [0.055], and Rw = 0.0554 [0.060] for 1151 [1472] observed reflections. Key words: MX3+ salts, FT–Raman spectroscopy, X-ray crystal structures of SeCl3AsF6, SBr3SbF6, and preparation of SeCl3SbF6.

scholarly journals Fabrication, Characterization, and Antimicrobial Activity, Evaluation of Low Silver Concentrations in Silver-Doped Hydroxyapatite Nanoparticles

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
A. Costescu ◽  
C. S. Ciobanu ◽  
S. L. Iconaru ◽  
R. V. Ghita ◽  
C. M. Chifiriuc ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Raman Spectroscopy ◽  
Hydroxyl Groups ◽  
Major Public Health Problem ◽  
Hydroxyapatite Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Raman Spectroscopy ◽  
Ft Ir ◽  
Ft Raman

The aim of this study was the evaluation of(Ca10-xAgx)(PO4)6(OH)2nanoparticles (Ag:HAp-NPs) for their antibacterial and antifungal activity. Resistance to antimicrobial agents by pathogenic bacteria has emerged in the recent years as a major public health problem worldwide. In this paper, we report a comparison of the antimicrobial activity of low concentrations silver-doped hydroxyapatite nanoparticles. The silver-doped nanocrystalline hydroxyapatite powder was synthesized at 100°C in deionised water. The as-prepared Ag:Hap nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), FT-IR, and FT-Raman spectroscopy. X-ray diffraction (XRD) studies demonstrate that powders obtained by coprecipitation at 100°C exhibit the apatite characteristics with good crystal structure, without any new phase or impurities found. FT-IR and FT-Raman spectroscopy revealed the presence of the various vibrational modes corresponding to phosphates and hydroxyl groups and the absence of any band characteristic to silver. The specific microbiological assays demonstrated that Ag:HAp-NPs exhibited antimicrobial features, but interacted differently with the Gram-positive, Gram-negative bacterial and fungal tested strains.

The preparation, X-ray crystal structure, and spectroscopic characterization of pentafluorophenyl-bis(pentafluorophenylthio)sulfonium hexafluoroarsenate, [(C6F5S)2SC6F5][AsF6]

1998 ◽  
Vol 76 (7) ◽  
pp. 1050-1059 ◽  
Author(s):  
Scott Brownridge ◽  
T Stanley Cameron ◽  
Jack Passmore ◽  
Gabriele Schatte ◽  
George W Sutherland
Keyword(s):  
Crystal Structure ◽  
Raman Spectroscopy ◽  
Room Temperature ◽  
Spectroscopic Characterization ◽  
Orthorhombic Space Group ◽  
X Ray ◽  
Cell Dimensions ◽  
Ft Raman Spectroscopy ◽  
Ft Raman

Pentafluorophenyl-bis(pentafluorophenylthio)sulfonium hexafluoroarsenate, [(C6F5S)2SC6F5][AsF6], was prepared by the reaction of (C6F5)2S2 and AsF5 in liquid SO2 at room temperature. The compound has been characterized by single-crystal X-ray and powder diffraction, and IR and FT-Raman spectroscopy. Crystals of [(C6F5S)2SC6F5][AsF6] are orthorhombic, space group P212121 (cell dimensions measured at room temperature in brackets): a = 13.132(3) [13.157(2)] Å, b = 21.477(4) [21.575(3)] Å, c = 8.770(2) [8.775(1)] Å, α = ß = γ = 90.00°; V = 2473.3(9) Å3, Z = 4, temperature = 181 ± 1 K. The structure consists of [AsF6]- anions and [(C6F5S)2SC6F5]+ cations that have a different structure than the related [X2MMMX]+ cations (M = S, Se; X = Cl, Br), which contain a trichalcogen chain with a pronounced chalcogen-chalcogen bond alternation. Ab initio calculations suggest the observed [(C6F5S)2SC6F5]+ geometry is due to steric and solid state effects. Comparison of the Raman spectra of [(C6F5)S2SC6F5][AsF6], [Cl2SSSCl][AsF6], and [(CH3)2ClS3]+ implies that [(CH3)2ClS3]+ has a structure with equal sulfur-sulfur distances, and therefore the structure is likely [(CH3S)2SCl]+ and probably not the previously reported [(CH3)2SSSCl]+.Key words: [R3X3]+ cations, X-ray crystal structure, FT-Raman spectroscopy, [(C6F5S)2SC6F5]+, pentafluorophenyl-bis(pentafluorophenylthio)sulfonium cation, hexafluoroarsenate.

scholarly journals Reactions Between Chalcogen Donors and Dihalogens/Interalogens: Typology of Products and Their Characterization by FT-Raman Spectroscopy

2006 ◽  
Vol 2006 ◽  
pp. 1-12 ◽  
Author(s):  
Massimiliano Arca ◽  
M. Carla Aragoni ◽  
Francesco A. Devillanova ◽  
Alessandra Garau ◽  
Francesco Isaia ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Chemical Bond ◽  
Structural Features ◽  
Structural Motif ◽  
X Ray ◽  
Ft Raman Spectroscopy ◽  
Ft Raman

The chemical bond and structural features for the most important classes of solid products obtained by reacting chalcogen donors with dihalogens and interhalogens are reviewed. Particular attention is paid to the information the FT-Raman spectroscopy can confidently give about each structural motif considered in the absence of X-ray structural analyses.

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