Proton Nuclear Magnetic Resonance Studies of Ferrous-thiolate Complexes PDF Download
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Author: Claude Richard Parmely
Publisher:
ISBN:
Category : Cytochrome P-450
Languages : en
Pages : 102
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Book Description
Author: Claude Richard Parmely
Publisher:
ISBN:
Category : Cytochrome P-450
Languages : en
Pages : 102
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Book Description
Author: Richard Joseph Kula
Publisher:
ISBN:
Category : Ethylenediaminetetraacetic acid
Languages : en
Pages : 78
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Book Description
Author: G.N. la Mar
Publisher: Springer Science & Business Media
ISBN: 9401585733
Category : Science
Languages : en
Pages : 403
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Book Description
Since A. Kowalsky's first report of the spectrum of cytochrome c in 1965, interest in the detection, assignment and interpretation of paramagnetic molecules has surged, especially in the last decade. Two classes of systems have played a key role in the development of the field: heme proteins and iron-sulfur proteins. These two systems are unique in many respects, one of which is that they contain well-defined chromophores, each of which can be studied in detail outside the protein matrix. They are the most successfully studied macromolecules, and the first eight and last six of the seventeen contributions to this book deal with heme and/or iron-sulfur proteins. The middle three chapters survey the progress on, and significant promise of, more difficult systems which do not possess a chromophore, but which have nevertheless yielded remarkable insights into their structure.
Author: David Lee Budd
Publisher:
ISBN:
Category :
Languages : en
Pages : 662
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Book Description
Author: David Benedict Viscio
Publisher:
ISBN:
Category :
Languages : en
Pages : 372
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Book Description
![Proton Nuclear Magnetic Resonance Study of [pi]-allyl-iron Carbonyls PDF](https://books.google.com/books/content/images/frontcover/IbQdAQAAMAAJ?fife=w80-h100)
Author: Shin-ichi Yoshida
Publisher:
ISBN:
Category : Carbonyl compounds
Languages : en
Pages : 240
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Book Description
Author: Joseph A. Kargol
Publisher:
ISBN:
Category : Nuclear magnetic resonance
Languages : en
Pages : 434
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Book Description
Author: S. Z. Ndzuta
Publisher:
ISBN:
Category : Magnetism
Languages : en
Pages : 50
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Book Description
Author: Sivuyile Zukiso Ndzuta
Publisher:
ISBN:
Category : Extraction (Chemistry)
Languages : en
Pages : 100
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Book Description
Author: Stanley John Backs
Publisher:
ISBN:
Category : Nuclear magnetic resonance
Languages : en
Pages : 0
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Book Description
The aqueous solution chemistry of trimethyllead(IV) and of the trimethyllead(IV) complexes of selected organic ligands has been investigated by proton magnetic resonance spectroscopy. The formation constants for the (CH-Pb" 1 " complexes of hydroxide ion and of the various sulfhydryl and carboxyl functional groups of 2-mercaptoethanol, glycine, N-acetyl-D,L-penicillamine, D,L-penicillamine, L-cysteine and glutathione were deter- mined from the pH dependence of the chemical shift of the methyl protons of trimethyllead. One-to-one stoichiometry was dominant in all experimental cases. In addition, weak two-to-one metal-to-ligand complexes were observed for the trimethyllead complexes of hydroxide ion and of the sulfhydryl groups of 2-mercaptoethanol and glutathione. No evidence of amino group complexation by trimethyllead was found. The formation constants of the carboxylate complexes and of the various two-to-one metal-to-ligand complexes are small, while those of the sulfhydryl complexes of one-to-one stoichiometry are generally several orders of magnitude higher. The extent of complex formation is strongly pH dependent due to the competitive effects of ligand functional group protonation at neutral or low pH and (CHPbOH formation at high pH. This pH dependence is illustrated by calculations of the species distributions and the conditional formation constants of the various complexes as functions of pH. The trimethyllead chemical shifts of the sulfhydryl and carboxylate complexes are found further upfield and the formation constants increase as the pK a of the ligand functional group increases. To some extent, other factors such as steric and electrostatic effects also appear to influence these parameters.
