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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of applied physiology 51 (1983), S. 61-66 
    ISSN: 1439-6327
    Keywords: EEG power spectrum ; Static muscle work ; Central nervous activation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Changes in parameters of the EEG power density spectrum were demonstrated in four healthy male subjects during fatiguing static muscle contractions (M. biceps brachii dexter). For the following EEG frequency bands (delta 1–4 Hz, theta 4–8 Hz, alpha 8–13 Hz, beta 13–20 Hz), the relative power and the peak frequencies were determined. A significant increase in the alpha peak frequency was observed during muscle work. This trend was evident in both the central leads (C3-A1, C4-A1) and the occipital (O1-A1), particularly when the subjects had their eyes closed. These changes in peak frequency might be connected with an increase in central nervous activation.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 461 (1980), S. 67-73 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal and Molecular Structure of Bis(1,1-diethyl-3-benzoyl-thioureato)copper(II)Bis(1,1-diethyl-3-benzoyl-thioureato)copper(II) exists in three monoclinic modifications, of which the crystallographic data have been determined. The crystal and molecular structure of one of the three modifications has been determined by X-ray structure analysis. This modification crystallizes in the space group P21/c with a = 8.871, b = 29.492, c = 12.281 Å, β = 124.50° and with 4 formula units per unit cell. The structure was solved by heavy atom technique and refined to a final R value of R = 0.05. The coordination polyhedron is a distorted tetrahedron. The S and O atoms are arranged in cis position. The chelate rings are not planar but distorted in characteristic manner.
    Notes: Bis(1,1-diäthyl-3-benzoyl-thioureato) kupfer(II) existiert in drei monoklinen Modifikationen, deren kristallographische Daten ermittelt wurden. Die Kristall- und Molekül-struktur einer der drei Modifikationen wurde mittels Röntgenkristallstrukturanalyse bestimmt. Diese Modifikation kristallisiert monoklin in der Raumgruppe P21/c mit den Gitterkonstanten a = 8,871, b = 29,492, c = 12,281 Å, β = 124,50° und 4 Formeleinheiten pro Elementarzelle. Die Struktur wurde mittels der Schweratommethode gelöst und bis zu einem R-Wert von R = 0,05 verfeinert. Das Koordinationspolyeder ist ein verzerrtes Tetraeder. Die S- und O-Ligatoratome liegen in cis-Anordnung vor. Die Chelatringe sind nicht eben gebaut, sondern in charakteristischer Weise gewellt.
    Additional Material: 4 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 513 (1984), S. 123-132 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal and Molecular Structure of Bis[N-(diethylaminothiocarbonyl)-N′-phenyl-benzamidinato]copper(II)The structure of bis[N-(diethylaminothiocarbonyl)-N′-phenyl-benzamidinato]-copper(II) has been determined by X-ray structure analysis. The compound crystallizes in the orthorhombic space group Pbca with a = 27.792, b = 19.197, c = 12.325 Å and 8 formula units per unit cell. The structure was solved by heavy atom technique. The final R value was R = 0.06 for 1589 observed symmetry independent reflections. The coordination polyhedron is a distorted tetrahedron. In spite of the bulky phenyl groups the ligator atoms are arranged in cis position. The chelate rings deviate clearly from planarity. The phenyl rings are appreciably twisted against the chelate rings.
    Notes: Die Struktur von Bis[N-(diethylaminothiocarbony)-N′-phenylbenz-amidinato]kupfer(II) wurde mittels Röntgenkristallstrukturanalyse bestimmt. Die Verbindung kristallisiert orthorhombisch in der Raumgruppe Pbca mit den Gitterkonstanten a = 27,792, b = 19,197, c = 12,325 Å und 8 Formeleinheiten pro Elementarzelle. Gelöst wurde die Struktur mittels der Schweratommethode. Der abschließende R-Wert betrug R = 0,006 für 1589 beobachtete symmetrieunabhängige Reflexe. Das Koordinationspolyder ist ein verzerrtes Tetraeder. Die Ligatoren sind trotz der sperrigen Phenylringe in cis-Stellung angeordnet. Die Chelatringe weichen deutlich von Planarität ab. Die Phenylringe sind gegenüber den Chelatringen beträchtlich verdreht.
    Additional Material: 5 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 514 (1984), S. 223-230 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Mass Spectrometric Fragmentation of NiII Chelates with O-, N-, S-, Se-Donor AtomsThe mass spectra of 6NiII chelates having the same substituents but different donor atoms (sequence of ligand atoms —C(X)—NH—C(Y)—; X, Y = O, S, Se, NH; see formula (1)) are discussed. The fragmentation pattern of the (thio)benzoyl(thio, seleno)ureas are characterized by the abstraction of S or Se atoms. The appearence of small neutral molecules seems to be typical for the fragmentation of all complexes. The mass spectrum of the NiII chelate having a NiS2Se2 coordination sphere shows no molecular ion peak. The contents of molecular ions in the total ion stream correlates with the stability of the complexes.
    Notes: Die Massenspektren von sechs NiII-Chelaten mit gleicher Ligandenperipherie aber unterschiedlichen Donoratomkombinationen (Atomsequenz der Liganden —C(X)—NH—C(Y)—; X, Y = O, S, Se, NH; siehe Formelbild (1)) werden diskutiert. Die Fragmentierung der (Thio)Benzoyl-(thio,seleno)harnstoffkomplexe wird durch die Abgabe von S bzw. Se eingeleitet. Charakteristisch für die Fragmentierungsmuster aller Chelate ist die Abgabe kleiner neutraler Moleküle. Das NiII-Chelat mit einer NiS2Se2-Koordinationssphäre ist thermisch instabil; im Massenspektrum wird kein Molekülion beobachtet. Die Prozentsummen der Molekülionen der Chelate mit NiO4-, NiO2S2-, NiO2Se2-, NiN2S2- und NiS4-Koordination korrelieren mit der Komplexstabilität.
    Additional Material: 2 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 515 (1984), S. 41-50 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal and Molecular Structure of Bis[N-(diethylaminothiocarbonyl)-N′-phenyl-benz-amidinato]nickel(II)The structure of bis[N-(diethylaminothiocarbonyl)-N′-phenyl-benzamidinato]-nickel(II) has been determined by X-ray structure analysis. The compound crystallizes in orthorhombic space group P212121 with a = 16.36, b = 16.94, c = 12.96 Å and Z = 4. The solution of the structure was performed by heavy atom technique and gave a final R value of R = 0.055 for 1764 observed reflections. The coordination polyhedron has a tetrahedrally distorted shape. The ligator atoms are arranged in cis position. The chelate rings deviate clearly from planarity. Against the chelate rings the phenyl rings are appreciably twisted. The title compound is compared regarding its structure with the analogous copper chelate.
    Notes: Mittels Röntgenkristallstrukturanalyse wurde die Struktur von Bis[N-(diethylaminothiocarbonyl)-N′-phenyl-benzamidinato]nickel(II) bestimmt. Die Substanz kristallisiert orthorhombisch in der Raumgruppe P212121 mit den Gitterkonstanten a = 16,36, b = 16,94, c = 12,96 Å und Z = 4. Die Lösung der Struktur erfolgte mit der Schweratommethode und führte zu einem abschließenden R-Wert von R = 0,055 für 1764 beobachtete Reflexe. Das Koordinations-polyeder hat eine tetraedrisch verzerrte Form. Die Ligatoren sind in cis-Stellung angeordnet. Die Chelatringe weichen deutlich von der Planarität ab. Gegenüber den Chelatringen sind die Phenylringe beträchtlich verdreht. Die Titelsubstanz wird bezüglich ihrer Struktur mit dem analogen Kupferchelat verglichen.
    Additional Material: 5 Ill.
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  • 6
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Syntheses and Properties of Mono- and Disubstituted Monothio-β-dicarbonyl Compounds and their Nickel(II) chelatesReaction of phenylacetaldehyde with phosphorous oxichloride and dimethylformamide yielded 3-chloro-2-phenyl-propenal, which was converted into 2-phenyl-monothiomalonic dialdehyde 2 by treating with sodium sulfide nonahydrate. Furthermore the reactions of other mono- and diphenylsubstituted monothio-β-dicarbonyl compounds with aniline on the one side and nickel(II)acetate on the other side have been studied. It was shown, that compounds 1-6 react in different way with aniline yielding either sulfur free products or in case of 1 and 4 enaminothioketones, which are of interest as building blocks for syntheses.In contrast to this the nickel complexes of 1-6 indicates an one another similar, typical chelate structure, which have been elucidated by u.v.-vis-, i.r.- and x-ray photoelectron spectroscopy.
    Additional Material: 1 Ill.
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  • 7
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Mass Spectrometric Fragmentation of N-Benzoyl(thio)benzamides, N-Benzoyl(thio, seleno)ureas, and their Ni(II)- and Cu(II)-1:2-chelatesThe mass spectra of the title compounds are discussed. It can be shown that the difference between the fragmentations of the free and coordinated ligands is preferentially caused by different stabilities of the ligand-metal bonding. In the chelates the oxygen-metal bonding fragmentates considerably easier than the sulphur-metal bonding.
    Notes: Die Massenspektren der Titelverbindungen werden diskutiert. Es wird gezeigt, daß die Unterschiede in den elektronenstoßinduzierten Fragmentierungen der freien und der koordinierten Liganden im wesentlichen durch die verschiedene Stabilität der Ligatoratom-Metall-Bindung verursacht werden. Die Sauerstoff-Metall-Bindung fragmentiert im Chelat wesentlich leichter als die Schwefel-Metall-Bindung.
    Additional Material: 4 Tab.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 498 (1983), S. 139-152 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structure of N-BenzoylthiobenzamideN-Benzoylthiobenzamide forms two polymorphic modifications of which the crystal and molecular structures have been determined by X-ray structure analysis. In both modifications the molecules exist as NH tautomeres, but there are differences with regard to their rotameric configurations. In the monoclinic modification both symmetry independent molecules have a Z,Z′ configuration. The triclinic modification also contains two symmetry independent molecules, but now a Z,Z′ and an E,Z′ configuration exist. All four molecules deviate appreciably from planarity. The results of both structure determinations are compared with each other and with the structure of monothiodibenzoylmethane.
    Notes: N-Benzoylthiobenzamid bildet zwei polymorphe Modifikationen, deren Kristall- und Molekülstrukturen mittels Röntgenkristallstrukturanalyse ermittelt wurden. In beiden Formen liegen die Moleküle als NH-Tautomere vor. Unterschiede bestehen hinsichtlich der rotameren Konfigurationsverhältnisse. In der monoklinen Modifikation liegen beide symmetrieunabhängigen Moleküle in einer Z,Z′-Konfiguration vor. In der triklinen Modifikation, die ebenfalls zwei symmetrie-unabhängige Moleküle enthält, sind sowohl eine Z,Z′- als auch eine E,Z′-Konfiguration realisiert. Alle Moleküle weichen stark von der Planarität ab. Die Ergebnisse der beiden Strukturbestimmungen werden miteinander und mit der des Monothiodibenzoylmethans verglichen.
    Additional Material: 7 Ill.
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  • 9
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Dynamic N.M.R. Studies of Hindered Rotation on N—C(X) Bond Increment. XVI. Central Metal Atom Influence on Rotational Barriers of the Restricted C, N-Rotation and the 13C N.M.R. Spectra of the Metal Complexes of 1,1-Diethyl-3-benzoyl-thio(seleno) UreaThe rotational barriers about the partial C, N-double bond Et2N—C(X) in the metal complexes of 1,1-diethyl-3-benzoyl-thio(seleno) urea are submitted, corrected for the compounds of low Δν value. The barriers are dependent on the electric polarizibility of the metal ion and the chalcogen atom X (S, Se). The results are discussed. In the 13C n.m.r. spectra of the investigated compounds also the most electron attractive metal ions influence characteristic variations of 13C chemical shifts.
    Notes: Die Rotationsbarrieren um die partielle C, N-Doppelbindung Et2N—C(X) in den Metallchelaten des 1,1-Diethyl-3-benzoyl-thio(seleno)-harnstoffs (M = NiII, PdII, PtII, ZnII, PbII, CuI und TlI) werden berichtet und für die Verbindungen mit niedrigen Δν-Werten (〈 8 Hz) korrigiert. Die bestimmten ΔGc≠-Werte sind von der mittleren elektrischen Polarisierbarkeit des Metallatoms und der Art des Chalkogenatoms X (S, Se) abhängig. Die erhaltenen Ergebnisse werden diskutiert. In den 13C-NMR-Spektren werden die Liganden-C-Atome durch die Komplexierung mit den Metallionen abhängig von deren elektronenziehendem Charakter unterschiedlich beeinflußt.
    Additional Material: 4 Ill.
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  • 10
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structural and Bonding Properties of Quadridentate and Bidentate Cobalt(II) and Copper(II) Schiff Base Complexes and Oxygenation Behavior of the CoII Complexes. An ESR StudyESR investigations on the low-spin cobalt(II) chelates bis(benzoylacetaldehyde)-ethylendiimine-cobalt(II), bis(benzoylacetaldehyde)-1,2-cyclohexandiimine-cobalt(II) and bis(p-chlor-β-mercaptozimtaldanilato)-cobalt(II) as well as the corresponding copper(II) chelates are reported. The large anisotropy of the g tensor of the CoII chelates caused by strong spin-orbit interactions, and the position of the maximum g tensor component gx in the molecules obtained by comparison with the ESR spectra of the CuII complexes predicts a MO for the unpaired electron which consists mainly of the Co dyz obital. In solution (CHCl3/pyridine) the CoII chelates react immediately with molecular oxygen forming [CoLn(O2)(py)] species characterized by ESR spectra with strongly reduced g tensor anisotropy and small 59Co hyperfine coupling constants. The unpaired electron appears to be mainly localized in the O2-part of hte molecules. The CoN2S2 coordination sphere shows a lower affinity to oxygen than the CoN2O2 type complexes.In the CuN2O2 complexes the unpaired electron is found to be in a MO containing the Cu dxy orbital. Due to remarkable covalency14 N and H hyperfine interactions are observed in the ESR spectra. Analyzing the hyperfine coupling constants the extent of unpaired spin density on the N donor atoms and the N-2s/2p hybridization degree is estimated.
    Notes: Es wird über ESR-Untersuchungen an den Niedrigspin-Cobalt(II)-Chelaten Bis(benzoylacetaldehyd)-ethylendiimin-cobalt(II), Bis(benzoylacetaldehyd)-1,2-cyclohexandiimin-cobalt(II) und Bis(p-chlor-β-mercaptozimtaldanilato)cobalt(II) sowie den entsprechenden Kupfer(II)-Chelaten berichtet. Die durch starke Spin-Bahn-Wechselwirkungen verursachte ausgeprägte Anisotropie des g-Tensors der CoII-Chelate sowie die durch Vergleich mit den ESR-Spektren der CuII-Chelate erhaltene Lage der maximalen g-Tensorkomponente gx in den Molekülen ist in Übereinstimmung mit einem MO für das ungepaarte Elektron, das hauptsächlich aus dem Co-dyz-Orbital besteht. In Lösungen (CHCl3/Pyridin) reagieren die CoII-Chelate rasch mit molekularem Sauerstoff unter Bildung von [CoLn(O2)(py)]-Komplexspezies. Ihre Spektren sind durch eine stark verringerte g-Tensoranisotropie sowie kleine 59Co-Hyperfeinstruktur-Kopplungskonstanten charakterisiert. Das ungepaarte Elektron befindet sich im hohen Maße im O2--Teil der Moleküle. Die Sauerstoffaffinität der CoN2S2-Koordinationssphäre erweist sich gegenüber „CoN2O2“ als geringer.Das ungepaarte Elektron der „CuN2O2“-Chelate befindet sich in einem MO, das die Cu-dxy-Funktion enthält. Infolge beachtlicher Kovalenz werden in den ESR-Spektren 14N- und 1H-Hyperfeinstruktur-Wechselwirkungen beobachtet. Aus den 14N-Hyperfeinstruktur-Kopplungskonstanten wird das Ausmaß an ungepaarter Spindichte an den N-Atomen sowie der N-2s/2p-Hybridisierungsgrad bestimmt.
    Additional Material: 7 Ill.
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