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Wednesday, August 12, 2020 | History

2 edition of Electron spin resonance studies of pentavalent and trivalent chromium. found in the catalog.

Electron spin resonance studies of pentavalent and trivalent chromium.

Louis Laurens van Reijen

Electron spin resonance studies of pentavalent and trivalent chromium.

by Louis Laurens van Reijen

  • 117 Want to read
  • 35 Currently reading

Published in Amsterdam .
Written in English

    Subjects:
  • Electron paramagnetic resonance.,
  • Valence (Theoretical chemistry),
  • Chromium.

  • The Physical Object
    Pagination134 p. :
    Number of Pages134
    ID Numbers
    Open LibraryOL19206831M

    The continuously expanding field of electron spin resonance (ESR) has broadened our understanding of physics, chemistry, biology, medicine and related sciences over the last fifty years. In the first volume Professors Poole and Farach provided one of the first definitive reference tools for this. Hydrogen has only one valence electron, but it can form bonds with more than one atom. In the bifluoride ion ([HF 2] −), for example, it forms a three-center four-electron bond with two fluoride atoms: [ F–H F – ↔ F – H–F ] Another example is the Three-center two-electron bond in diborane (B 2 H 6). Maximum valences of the elements.

      Electron spin resonance (ESR) and electron spin echo modulation (ESEM) spectroscopies were used to study the reducibility, location, and adsorbate interactions of Ni(I) in NiH−SAPO, in which Ni(II) was introduced into extraframework sites of SAPO by partial ion exchange of H(I) by Ni(II). After dehydration at temperatures above K as well as after γ-irradiation . Electron spin resonance study on the vanadium adsorption by persimmon tannin gel. but less effectively for trivalent chromium (Nakajima, ; Nakajima .

    Recent electron paramagnetic resonance investigations [10] [11] [12] demonstrate that vacancy at the magnesium M2 site does exist and is of importance in the chromium-activated forsterite. These. Cite this article. Molochnikov, L.S., Vishnevskaya, G.P., Balakin, S.M. et al. An ESR study of complex formation by Cr(III) ions with ANKF-2B amphoteric ion-exchange.


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Electron spin resonance studies of pentavalent and trivalent chromium by Louis Laurens van Reijen Download PDF EPUB FB2

The present version is the result of extensive revision and expansion of the original notes. Experience with such courses has convinced us that there are large numbers of chemists, physicists, and biologists who have a strong interest in electron spin resonance.

The mathematical training of most of the short-course students is limited to calculus. Electron spin resonance studies of pentavalent and trivalent chromium. By LL van Reijen. Topics: dissertations the and tu/e, chemistry: dissertations, free radicals - electron spin resonance, Author: LL van Reijen.

Specialist Periodical Reports provide systematic and detailed review coverage of progress in the major areas of chemical research. Written by experts in their specialist fields the series creates a unique service for the active research chemist, supplying regular critical in-depth accounts of progress in particular areas of chemistry.

For over 80 years the Royal Society of Chemistry and its. Optical absorption and electron spin resonance (ESR) spectra of a chromium‐doped phosphate glass have been studied as a function of Cr2O3 concentration. While the optical spectrum appears to be independent of chromium‐ion density, the ESR spectrum exhibits a pronounced concentration dependence.

The spectra have been attributed to a combination of isolated, octahedrally coordinated Cited by:   In the twenty-five years since its discovery by Zavoiskii, the technique of electron spin resonance (ESR) spectroscopy has provided detailed struc tural information on a variety of paramagnetic organic and inorganic sys tems.

It is doubtful that even much later than any chemist would have been so bold as to predict the great diversity of systems which have proved amenable to study by. Bacterial reduction of Cr(VI) to Cr(III) compounds may produce reactive intermediates Cr(V) and Cr(IV), which can affect the mobility and toxicity of chromium in environments.

To address this important subject, we conducted an electron spin resonance (ESR) study to understand the kinetics of the formation and decomposition of Cr(V) during Cr(VI) reduction by different Gram-positive Cr(VI. The continuously expanding field of electron spin resonance (ESR) has broadened our understanding of physics, chemistry, biology, medicine and related sciences over the last fifty years.

In the first volume Professors Poole and Farach provided one of the first definitive reference tools for this field. These handbooks bring together wide- ranging data from diverse disciplines within ESR and.

Here, we report an electron spin resonance (ESR) study of Cr(III) hydroxide formation from Cr(V)-diols by this bacterial strain as cells were exposed to 35,and mg/L of Cr(VI) under. Abstract We have compared the acute toxicities of the trivalent arsenic species arsenite, oxophenylarsine (PhAsO), 2‐chlorovinyloxoarsine (ClvinAsO), methyloxoarsine (MeAsO), and of the pentavalent.

ELECTRON SPIN RESONANCE STUDY OF CHROMIUM OXIDE CATALYSTS FOR THE POLYMERIZATION OF ETHYLENE * G. SERGEYEV, O.K. SHARAYEV, K. TOPCHIEVA, A. PEREL'MAN and A. TOPCHIEV Institute of Petroleum-Chemical Synthesis of the U.S.S.R. Academy of Sciences; Chemical Faculty, Moscow University (Receive, t 24 November ) IN AN investigation of the polymerization of ethylene on a chromium.

Electron paramagnetic resonance and optical studies of pentavalent uranium. 1. Introduction. Chromium is commonly used in acid electroplating, tanning, painting, dye and manufacturing, and petroleum health and environmental effects of carcinogenic Cr(VI) are well known.If Fe(II), HSO 3, or another electron donor such as organic matter is present, Cr(VI) can be reduced to Cr(III), which tends to be attenuated in soil by inorganic phases such as.

The compilation further considers pentahalides of transition metals and halide chemistry of chromium, molybdenum, and tungsten. The book closes with discussions on halogen chemistry of actinides and halogeno metal carbonyls and related compounds.

Covered areas include trivalent, tetravalent, pentavalent, and hexavalent actinides, and structures. Results from analytical titration measurements indicate that chromium is tetravalent in the samples investigated.

Based on electron-spin resonance measurements at temperatures as low as 11 K, no trivalent chromium and only a trace of pentavalent chromium ( ppm) was detected in the samples used for optical studies. Second edition of classic reference offers overall summary and bibliography of experimental techniques and a balanced treatment of both theoretical and practical aspects of ESR instrumentation.

Includes coverage of enhancement techniques, helices and acoustic spin resonance; how to build and use ESR spectrometer. References. text figures. s: 1. Electron spin resonance study on chromium adsorption by PT gel. To examine the chemical state of Cr adsorbed on the PT gel, electron spin resonance spectra of the gel were measured.

Trivalent chromium, Cr(III), containing unpaired electron, is ESR positive, while Cr(VI) with no unpaired electron is ESR negative. Optical absorption and electron spin resonance spectral studies of vanadyl chloro complexes formed in the solvent extraction systems with Aliquat, TOA, TOPO and TBP.

Journal of Inorganic and Nuclear Chemistry41 (2), DOI: /(79) M. Krishnamurty. Induced Representation Method in the Theory of Electron Structure and Superconductivity. Yarzhemsky; Classes of admissible exchange-correlation density functionals for pure spin and angular momentum states.

Andreì L. Tchougréeff, János G Electron spin resonance studies of pentavalent and trivalent chromium. van Reijen. EXPERIMENTAL RESULTS AND THEIR DISCUSSION Structural studies of pentavalent Cr (3d'), Mo(4d') and W(5d') oxyfluorides Frozen solutions of Q^, Mov and ^v oxyfluorides in concentrated hy- drofluoric acid (Fig.

l(a), (b)) at 77 K in the frequency range v ^ G Fig. Electron Spin Resonance (ESR) Microscopy in Materials Science M Ikeya Annual Review of Materials Science DEER Distance Measurements on Proteins Gunnar Jeschke Annual Review of Physical Chemistry New Technologies in Electron Spin Resonance Jack H.

Freed. Abstract. The technique of electron spin resonance may be regarded as a fascinating extension of the Stern-Gerlach experiment. In one of the most fundamental experiments on the structure of matter, Stern and Gerlach showed that an atom with a net electron magnetic moment can take up only discrete orientations in a magnetic field.The Low-Field Pulsed Mode Dynamic Nuclear Polarization in the Pentavalent Chromium Complex and Crude Oils H.-L.

Electron Spin Resonance Study Of (EPR) and double electron-nuclear resonance.Electron spin resonance (ESR) spin trapping measurements showed that incubation of cells with Cr (VI) generated hydroxyl radical ( OH). These results ( OH) produced by H 2 O 2 and Cr(VI) reductive intermediates (i.e.

Cr(V) and Cr(IV)) played a major role in causing G .