Photo- and Thermo-Chromic Study of the Ethylenediamine Trimolybdate

2008 ◽  
Vol 47-50 ◽  
pp. 1193-1196
Author(s):  
De Hui Sun ◽  
Hong Jie Zhang ◽  
Ji Lin Zhang ◽  
Jiang Bo Yu
Keyword(s):  
Crystal Structure ◽  
Raman Spectroscopy ◽  
Fourier Transform ◽  
Powder Diffraction ◽  
Color Difference ◽  
Laser Raman Spectroscopy ◽  
X Ray ◽  
Laser Raman ◽  
Thermochromic Properties ◽  
The Difference

The ethylenediamine trimolybdate (ENTMo) can show unusually photochromic and thermochromic properties and there exists in the difference of chromic mechanisms, which has been proved in our previous work [1]. In this paper, X-ray powder diffraction (XRD), Fourier transform infrared (FTIR) and laser Raman spectroscopy (LRS) of the colored samples are characterized and analyzed in detail. The crystal structure, the inorganic skeleton and the microenvironment of center ions of the colored samples do not substantively change except distortion. The color difference of the photochromic and the thermochromic samples is discussed and that the difference of reduction sites result in their different chromic mechanisms is suggested.

A synergic approach of X-ray powder diffraction and Raman spectroscopy for crystal structure determination of 2,3-thienoimide capped oligothiophenes

2018 ◽  
Vol 20 (5) ◽  
pp. 3630-3636 ◽  
Author(s):  
C. Cappuccino ◽  
P. P. Mazzeo ◽  
T. Salzillo ◽  
E. Venuti ◽  
A. Giunchi ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Raman Spectroscopy ◽  
Powder Diffraction ◽  
Structure Determination ◽  
Molecular Conformation ◽  
Rapid Identification ◽  
Crystal Structure Determination ◽  
X Ray

This work presents a Raman based approach for the rapid identification of the molecular conformation in a series of new 2,3-thienoimide capped quaterthiophenes.

scholarly journals Characterization of Metal/Carbon Multilayers by Raman Spectroscopy

1989 ◽  
Vol 160 ◽  
Author(s):  
David D. Allred ◽  
Qi Wang ◽  
Jesus Gonzalez-Hernandez
Keyword(s):  
Raman Spectroscopy ◽  
Amorphous Semiconductor ◽  
Laser Raman Spectroscopy ◽  
Plasma Confinement ◽  
Ray Optics ◽  
X Ray ◽  
Laser Raman ◽  
Line Shapes ◽  
Two Peaks

AbstractLaser Raman spectroscopy has been found to be useful for characterizing amorphous semiconductor multilayers, especially the interfaces of multilayers. Recently, we have extended this technique to the characterization of magnetron sputtered multilayers commonly used as reflectors in soft x-ray optics. Unlike the multilayers previously studied which contained only semiconductors and dielectrics, these are generally semiconductor/metal multilayers. We report here on the Raman characterization of the most common class of multilayers used in soft x-ray optics, those that contain a high density metal like tungsten interspersed with layers of carbon. In all of the metal/carbon multilayers the dominate feature in the Raman spectra is due to a-C. The a-C spectra consists of a broad peak at about 1560 cm-1 (G-peak) and a shoulder at about 1400 cm-1 (D-peak). This can be deconvoluted with Gaussian line shapes to yield two peaks (one at about 1560 to 1570 cm-1 and the other at about 1380 to 1420 cm-1). Among the W/C multilayer samples peak positions and relative magnitudes changed little with carbon thickness over the range of 1 to 12 nm. Significant differences are, however, seen as the identity of the metal component is altered or, especially, as the preparations are varied. For example, the intensity ratio of the D-peak to G-peak was much larger for multilayer samples prepared under conditions of good plasma confinement.

Zýkait z dolu Lehnschafter u Mikulova v Krušných horách (Česká republika) - popis a Ramanova spektroskopie

2021 ◽  
Vol 29 (2) ◽  
pp. 241-248
Author(s):  
Jiří Sejkora ◽  
Roman Gramblička
Keyword(s):  
Crystal Structure ◽  
Raman Spectroscopy ◽  
Czech Republic ◽  
Powder Diffraction ◽  
Diffraction Data ◽  
Water Molecules ◽  
Powder Diffraction Data ◽  
Unit Cell Parameters ◽  
X Ray ◽  
Cell Parameters

The zýkaite samples were found at abandoned Lehnschafter mine near Mikulov in the Krušné hory Mts. (Czech Republic). It occurs as irregular white to light greenish rounded to spherical aggregates up to 1.5 cm in size composed of tiny acicular crystals up to 5 - 10 μm in length. Its empirical formula can be expressed as (Fe3.79Al0.02)Σ3.81[(AsO4)2.66(PO4)0.20(SiO4)0.07]Σ2.93 (SO4)1.07(OH)0.44·15H2O (mean of 3 spot analyzes; on the basis of As+P+S+Si = 4 apfu).Zýkaite is probably monoclinic, with the unit-cell parameters refined from X-ray powder diffraction data: a 21.195(8), b 7.052(2), c 36.518(17) Å, β 91.07(2)° and V 5458(2) Å3. Raman spectroscopy documented the presence of both (AsO4)3- and (SO4)2- units in the crystal structure of zýkaite. Multiple Raman bands connected with vibrations of water molecules and (AsO4)3- groups indicate the presence of more structurally non-equivalent these groups in the crystal stucture of zýkaite.

Crystal structure determination from powder diffraction data of the coumarin vanillin chalcone

2014 ◽  
Vol 29 (4) ◽  
pp. 361-365 ◽  
Author(s):  
Afef Ghouili ◽  
Jan Rohlicek ◽  
Taïcir Ben Ayed ◽  
Rached Ben Hassen
Keyword(s):  
Crystal Structure ◽  
Fourier Transform ◽  
Powder Diffraction ◽  
Diffraction Data ◽  
Powder Diffraction Data ◽  
Unit Cell Parameters ◽  
Schmidt Reaction ◽  
X Ray ◽  
Cell Parameters ◽  
C Nmr

4-hydroxy-3-methoxyphenyl-4-hydroxycoumarin chalcone (C19H14O6) was synthesized by the Claisen–Schmidt reaction with the condensation of 3-acetyl-4-hydroxycoumarin with 4-hydroxy-3-methoxybenzaldehyde (vanillin). The new compound was characterized by Fourier transform infrared microscopy, UV–vis 1H, and 13C NMR spectroscopy and its crystal structure was ab initio determined from laboratory X-ray powder diffraction data. The crystal structure is monoclinic with unit-cell parameters a = 14.3181(4), b = 8.040 71(9), c = 13.5524(3), β = 100.3559(13)°, V = 1534.84(6) Å3, and space group P21/c.

Structural characterization of TiO2 ultrafine particles

1999 ◽  
Vol 14 (2) ◽  
pp. 442-446 ◽  
Author(s):  
Yingchun Zhu ◽  
Tiao Liu ◽  
Chuanxian Ding
Keyword(s):  
Crystal Structure ◽  
Raman Spectroscopy ◽  
Phase Transformation ◽  
Fourier Transform ◽  
Raman Spectra ◽  
Ultrafine Particles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Factors Influencing

Four samples of TiO2 ultrafine particles (UFP) were obtained through different processes. The structure of TiO2 ultrafine particles and the factors influencing the structure were investigated with Raman spectroscopy, Fourier transform infrared (FTIR) spectroscopy, and x-ray diffraction (XRD). Both Raman spectra and x-ray diffractograms show the similar regularity of the phase transformation among the four samples. The observed bimodal lineshape-structure in the Raman spectra is attributed to the intragrain and grain-boundary components of TiO2 UFP. The crystal structure of TiO2 UFP is found to be distorted by the surface structure such as OH and OCH2CH3 groups coordinated on the surface of TiO2 UFP.

Crystal structure of the synthetic analogue of iwateite, Na2BaMn(PO4)2: an X-ray powder diffraction and Raman study

2020 ◽  
Vol 235 (10) ◽  
pp. 433-437
Author(s):  
Gwilherm Nénert ◽  
M. Mangir Murshed ◽  
Teycir Ben Hamed ◽  
Thorsten M. Gesing ◽  
Mongi Ben Amara
Keyword(s):  
Crystal Structure ◽  
Raman Spectroscopy ◽  
Powder Diffraction ◽  
Synthetic Analogue ◽  
Expected Number ◽  
Space Group ◽  
X Ray ◽  
Cell Parameters ◽  
Group Assignment ◽  
Raman Study

AbstractWe have investigated the crystal structure of the synthetic analogue of the mineral iwateite using powder diffraction and Raman spectroscopy. Na2BaMn(PO4)2 crystallizes in the space group P$‾{3}$m1 (No. 164) with cell parameters a = 5.37292(1) Å, and c = 7.09538(1) Å (Rwp = 5.7%, V = 177.38 Å3, Z = 1). The space group assignment is supported by the experimentally observed 11 Raman active modes which agree with the expected number of modes for the P$‾{3}$m1 symmetry.

Applications of Fourier Transform Raman Spectroscopy in an Industrial Laboratory

1989 ◽  
Vol 43 (3) ◽  
pp. 516-522 ◽  
Author(s):  
F. J. Bergin ◽  
H. F. Shurvell
Keyword(s):  
Raman Spectroscopy ◽  
Fourier Transform ◽  
Near Infrared ◽  
Laser Raman Spectroscopy ◽  
Analytical Technique ◽  
Laser Raman ◽  
Fourier Transform Raman Spectroscopy ◽  
Ft Raman Spectroscopy ◽  
Ft Ir ◽  
Fourier Transform Raman

In the past, the usefulness of laser Raman spectroscopy as an analytical technique in industrial laboratories has been greatly reduced by problems of laser-induced fluorescence. One method of circumventing this problem is to use near-infrared excitation coupled with a modified FT-IR spectrometer. In this paper, we report the results of some initial exploratory experiments which indicate that significant fluorescence rejection can be achieved. This fluorescence rejection opens up new areas of application for Raman spectroscopy. The advantages and limitations of FT-Raman spectroscopy are discussed. In addition, some initial experiments are outlined on Fourier transform Raman microscopy using a conventional microscope.

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