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Tuesday, May 5, 2020 | History

2 edition of Spectroscopic studies of model compounds containing sulphur. found in the catalog.

Spectroscopic studies of model compounds containing sulphur.

David Lee Ledson

Spectroscopic studies of model compounds containing sulphur.

by David Lee Ledson

  • 133 Want to read
  • 31 Currently reading

Published in [Toronto] .
Written in English

    Subjects:
  • Sulfur compounds,
  • Spectrum analysis

  • Edition Notes

    ContributionsToronto, Ont. University. Theses (M. Sc.)
    Classifications
    LC ClassificationsLE3 T525 MSC 1968 L43
    The Physical Object
    Pagination[54 leaves]
    Number of Pages54
    ID Numbers
    Open LibraryOL20870796M

    cussion of the results obtained with an extended series of sulfur compounds. Since sulfur groups containing sulfur-oxygen (S=O) bonds have been studied extensively in other connections by one of us (B. J. L.), a large number of compounds containing this bond were available and the emphasis in the present investigation is. Spectroscopy Of Organic Compounds book. Read 10 reviews from the world's largest community for readers/5.

    This peak was assigned earlier to the thiosulphur atomA subsequent study provided evidence that the observed 33Speak should be assigned to the internal sulphur atom The results of the latter study are based upon the synthesis of S,Oi- in which the thiosulphur atoms are depleted in 33Sfrom the natural abundance value of % to %. Electron Paramagnetic Resonance (EPR) Spectroscopy. Electron paramagnetic/spin resonance (EPR/ESR) spectroscopy identifies and quantitates the degree to which metal and ligand atomic orbitals contribute the ground state wavefunction of transition metal sites in model compounds or metalloproteins containing unpaired electrons.

      1. Introduction. Sulfite oxidizing enzymes, including sulfite oxidase (SO) and sulfite dehydrogenase (SDH), catalyze the physiologically essential two-electron oxidation of sulfite to sulfate ([1,2]In plants and vertebrates, SO functions in the final metabolic degradation step of sulfur-containing compounds and serves to eliminate toxic sulfite from the organism [].Cited by: The assignment of the resonance was confirmed with the synthesis and spectroscopic analysis of model compounds. 86 Extensive NMR studies of the Fe 2 S 2 proteins have been reported. 87,87a. Resonance Raman spectra of Fe 2 S 2 si89,90 reveal many bands attributable to Fe-S stretching. Detailed assignments have been presented for the four.


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Spectroscopic studies of model compounds containing sulphur by David Lee Ledson Download PDF EPUB FB2

A. Spectroscopy. Compounds 2 – 4 were synthesized according to a previous report, 21 and samples suitable for low temperature studies were prepared in solutions of CHCl 3:toluene (2, mM; 3, mM; 4, mM). Room temperature Abs spectra were collected on a spectrophotometer (Hewlett Packard ) equipped with a circulating water by: 6.

Odorous compounds can be emitted from urban and industrial wastewater, namely at the different steps of the treatment process. Hydrogen sulphide and ammonia are the two main inorganic odorous compounds, whereas most of the malodorous organic ones arise from the anaerobic decomposition of compounds containing nitrogen or sulfur.

These malodorous species include nitrogeneous products (indoles, amines Cited by: Sulfur-containing model compounds could be a good substitute for coal in coal desulfurization studies [31], [32]. Basing on thiophene sulfur occurrence of coal [33], dibenzothiophene (DBT) was selected as the sulfur-containing model compound of thiophene sulfur in this work.

Organic sulphur compounds are volatile. A few compounds are soluble in water and are associated with bad odour. They are essentially studied in gaseous phase, but they can be present in wastewater because of their solubility in water-miscible solvents such as alcohols. FTIR Study of the Reaction of Polyphosphoric Acid and Model Bitumen Sulfur Compounds.

A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of. A study of the distribution of sulfur compounds in gasoline produced in China. Part 3.

Identification of individual sulfides and thiophenes. Fuel83 (), DOI: / Lante Carbognani, Joussef Espidel, Silvia by: For this model complex, normal mode analyses both from an optimized Urey–Bradley force field and from complementary density functional theory (DFT) calculations produced consistent results.

For Hmd, previous IR spectroscopic studies found strong CO stretching modes at and cm−1, interpreted as evidence for cis-Fe(CO)2 by: Journal of Organometallic Chemistry, () Elsevier Sequoia S.A., Lausanne JOM Raman spectroscopic study of the complexation of the methylmercury(II) cation, CH3Hg+, by ligands containing oxygen and sulphur C.A.

Barradell, H.G.M. Edwards '' and D.N. Smith Chemistry and Chemical Technology, University of Bradford, Bradford, West Yorkshire, BD7 IDP (UK) (Received Cited by: 1. Spectroscopic studies Article (PDF Available) in Cellulose Chemistry and Technology September with 1, Reads How we measure 'reads'.

Nowadays, the light oil reserves, which contain low levels of heteroatoms, are quickly decreasing, making it necessary to depend more on the use of heavyweight oil.

Sulfur compounds should be removed from petroleum feedstocks because they are released into the atmosphere as sulfur oxides during fuel combustion, causing atmospheric pollution. Two studies of the inhibition of phospholipase A2 activity were performed using phosphatidilcholine and 4-nitrooctanoyloxybenzoic acid as substrates, in both cases compound II showed the best.

Further sulfur speciation studies by sulfur K-edge XANES spectroscopy. , DOI: /B H.H. Richnow, A. Jenisch, W. Michaelis. Structural investigations of sulphur-rich macromolecular oil fractions and a kerogen by sequential chemical by: Spectroscopic studies show that the cobalamin appears to bind in a base-off conformation, whereby the dimethylbenzimidazole moiety of the cofactor is removed from the coordination sphere of the cobalt but not replaced by an imidazole side chain, which is a hallmark of many cobalamin-dependent enzymes.

Spectroscopy Books. This section contains free e-books and guides on Spectroscopy, some of the resources in this section can be viewed online and some of them can be downloaded. This note covers the following topics: introduction to spectroscopy, classical model of spectroscopy, time and frequency domain spectroscopy, principles for.

This paper selects two typical compounds containing organic sulfur as model compounds. Then, by analyzing the chromatograms of gaseous low-temp oxidation products and GC/MS of the extractable matter of the oxidation residue, we summarizing the mechanism of low-temp sulfur model compound oxidation.

The results show that between 30 °C to 80 °C, the interaction between diphenyl sulfide and Cited by: 8. The ability to assess the extent of delocalization in the iron protein vs the P-cluster is highlighted.

In addition, possible charge states for FeMoco on the basis of Fe K-edge XAS data are discussed. This study provides an important reference for future X-ray spectroscopic studies of iron–sulfur by: Mössbauer spectroscopy is a spectroscopic technique based on the Mössbauer effect, discovered by Rudolf Mössbauer (sometimes written "Moessbauer", German: "Mößbauer") inconsists of the nearly recoil-free emission and absorption of nuclear gamma rays in consequent nuclear spectroscopy method is exquisitely sensitive to small changes in the chemical.

CONCLUSIONS With the use of 31 P NMR spectroscopy in soil science for more than 20 years, phosphorus-containing compounds have been characterized in a. The antimicrobial effects of garlic (Allium sativum) extract (25, 50, 75,and μl/ml) and diallyl sulfide (5, 10 and 20 μM) on Listeria monocytogenes and Escherichia coli OH7 cultivated in tryptic soy broth at 4, 22 and 35°C for up to 7 days were investigated.L.

monocytogenes was more resistant to garlic extract and diallyl compounds treatment than E. coli by: tion of phenolic compounds is thus o f high importance and UV-visible spectroscopy has prov en to be one of the most suitable and reliable technique s to quantify these substances during the win.

Spectroscopy is the study of the interaction of electromagnetic radiation with matter. Spectroscopy has many applications in the modern world, ranging from nondestructive examination of materials to medical diagnostic imaging (e.g., MRIs, CAT scans).

In a chemical context, spectroscopy is used to study energy transitions in atoms and molecules.This study shows that externally induced changes in the intramolecular bonding, e.g., by coordination, conformation geometry or hydrogen-bonding, can significantly influence the S K-edge spectra, and emphasizes the importance of a similar chemical surrounding when choosing the model compounds for standard spectra of sulfur functional [email protected]{osti_, title = {Spectroscopic studies of carbon containing molecules and their break-up in PISCES-A}, author = {Pospieszczyk, A and Ra, Y and Hirooka, Y and Conn, R W and Goebel, D M and LaBombard, B and Nygren, R E}, abstractNote = {We have used the PISCES-A facility in order to study the behavior of carbon containing molecules in a representative plasma with parameters close Cited by: