Monoclinic and orthorhombic polymorphs of paracetamol—solid state linear dichroic infrared spectral analysis

2005 ◽  
Vol 738 (1-3) ◽  
pp. 233-238 ◽  
Author(s):  
Bojidarka B. Ivanova
Keyword(s):  
Spectral Analysis ◽  
Solid State ◽  
Infrared Spectral

Solid-phase polymerizations at high pressures

1970 ◽  
Vol 23 (3) ◽  
pp. 511 ◽  
Author(s):  
MG Bradbury ◽  
SD Hamann ◽  
M Linton
Keyword(s):  
High Pressure ◽  
Spectral Analysis ◽  
Solid State ◽  
High Pressures ◽  
Solid Phase ◽  
Crystal Form ◽  
Optical Cell ◽  
Itaconic Anhydride ◽  
Temperature Requirements ◽  
Infrared Spectral

The following compounds have been found to polymerize spontaneously in the solid state at pressures in the range 10-50 kbar, at temperatures between 20 and 200�C: acrylamide, p-phenylstyrene, potassium p-styrenesulphonate, itaconic anhydride, maleic anhydride, maleimide, 1,2,3,6-tetrahydrophthalic acid, 1,2,3,6-tetrahydrophthalic anhydride, acenaphthylene, p-benzoquinone, N,N'-p-phenylene-dimaleimide, sulpholene, diphenylacetylene, 8-trioxan. The pressure-temperature requirements for polymerization have been determined in a high-pressure "squeezer" apparatus and in a diamond optical cell which permits infrared spectral analysis of a specimen while it is under compression. Apart from diphenylacetylene and trioxan, the compounds that polymerized were either monosubstituted ethylenes or cyclic 1,2-disubstituted ethylenes. Non-cyclic 1,2-disubstituted ethylenes and tri-substituted and tetra-substituted ethylenes failed to polymerize. There is evidence that shearing stresses played a part in some of the reactions. 1-Allyl-2-thiourea did not polymerize, but transformed from its stable crystal form I to the unstable modification 11.

Radial Variation in Cellulose Content and Kraft Pulp Yield in Eucalyptus Nitens using Near-Infrared Spectral Analysis of Air-Dry Wood Surfaces

2010 ◽  
Vol 18 (2) ◽  
pp. 147-154 ◽  
Author(s):  
Geoffrey M. Downes ◽  
Roger Meder ◽  
Nicholas Ebdon ◽  
Helen Bond ◽  
Robert Evans ◽  
...  
Keyword(s):  
Spectral Analysis ◽  
Kraft Pulp ◽  
Near Infrared ◽  
Radial Variation ◽  
Pulp Yield ◽  
Cellulose Content ◽  
Eucalyptus Nitens ◽  
Infrared Spectral ◽  
Dry Wood ◽  
Wood Surfaces

scholarly journals Electrochemiluminescence Study of Europium (III) Complex with Coumarin3-Carboxylic Acid

2008 ◽  
Vol 2008 ◽  
pp. 1-6 ◽  
Author(s):  
Stefan Lis ◽  
Krzysztof Staninski ◽  
Tomasz Grzyb
Keyword(s):  
Aqueous Solution ◽  
Spectral Analysis ◽  
Energy Transfer ◽  
Solid State ◽  
Carboxylic Acid ◽  
Elemental Analysis ◽  
Aluminium Electrode ◽  
The Eu

The europium (III) complex of coumarin-3-carboxylic acid (C3CA) has been prepared and characterized on the basis of elemental analysis, IR, and emission (photoluminescence and electrochemiluminescence) spectroscopy. The synthesised complex having a formula Eu was photophysically characterized in solution and in the solid state. Electrochemiluminescence, ECL, of the system containing the Eu(III)/C3CA complex was studied using an oxide-covered aluminium electrode. The goal of these studies was to show the possibility of the use of electrochemical excitation of the Eu(III) ion in aqueous solution for emission generation. The generated ECL emission was very weak, and therefore its measurements and spectral analysis were carried out with the use of cut-off filters method. The studies proved a predominate role of the ligand-to-metal energy transfer (LMET) in the generated ECL.

scholarly journals DISTANT INFRARED SPECTRAL ANALYSIS OF INDUSTRIAL HOT GAS EJECTION IN ATMOSPHERE

2015 ◽  
Vol 3 (7) ◽  
pp. 86-90
Author(s):  
R.S. Asatryan ◽  
N.R. Khachatryan ◽  
H.S. Karayan
Keyword(s):  
Spectral Analysis ◽  
Integral Intensity ◽  
Ecological Monitoring ◽  
Combustion Products ◽  
Industrial Firms ◽  
Industrial Plants ◽  
Hot Gas ◽  
Integral Intensity Ratio ◽  
Infrared Spectral ◽  
Hydrocarbon Gas

Passive Infrared (IR) Spectral-radiometry of gases in the atmosphere is extremely important today, when pollution of the environment by natural ejections and those produced by human activity is growing very high. Particularly, spectral analysis of hot gas ejections i.e. combustion products from industrial plants is an essential part of ecological monitoring of the atmosphere. In this paper we present the results of IR spectral analysis of hot gas ejections from industrial plants in the spectral range from 2.5 to 5.5µm, at a distance of 3000m. The obtained with a hydrocarbon gas group, SO2, N2 O, CO and CO2 gases, as well as H2 O vapor. Relative content of ejected gases (to CO-CO2 group) per unit time was evaluated by means of an integral intensity ratio for each gas. Distant IR Spectral analysis of hot gas ejections (both industrial firms, and various vehicles) have huge value, in particular at ecological monitoring of an environment.

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