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  • 1
    Electronic Resource
    Electronic Resource
    Soil organic matter composition and pesticide bonding in sandy soils in relation to groundwater protection in the Northwest German Lower Plain (1996)
    Springer
    Biology and fertility of soils 23 (1996), S. 266-272 
    Details
    ISSN: 1432-0789
    Keywords: Key words Soil organic matter ; Microbial activity ; Groundwater contamination ; Pesticides ; Spodic horizons ; Landscape planning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In sandy gleyic soils with a low groundwater table under arboriculture in Northwest Germany, a wide variation of groundwater pollution by pesticides has been observed. We therefore examined data on microbial activity and soil organic matter composition by wet chemistry, cross-polarization magic-angle spinning and 13C nuclear magnetic resonance, and pyrolysis–field ionization mass spectromy. However, neither microbial activity nor the soil organic matter composition of cultivated topsoils explained the differences in xenobiotic leaching into the groundwater. Data from Anthrosols suggested that these soils have a higher capacity for pesticide bonding because of high amounts of aromatic and carboxylic C moieties in the soil organic matter. However, despite the same pesticide inputs and time of application, the leached output from these soils was higher than that from the Podzols. Initial data from subsoil investigations suggest that the presence of a spodic horizon most likely reduces groundwater pollution by pesticides. Studies to assess fixation capacity and desorption kinetics in Bh horison seem warranted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335954
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  • 2
    Electronic Resource
    Electronic Resource
    Soil organic matter composition and pesticide bonding in sandy soils in relation to groundwater protection in the Northwest German Lower Plain (1996)
    Springer
    Biology and fertility of soils 23 (1996), S. 266-272 
    Details
    ISSN: 1432-0789
    Keywords: Soil organic matter ; Microbial activity ; Groundwater contamination ; Pesticides ; Spodic horizons ; Landscape planning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In sandy gleyic soils with a low groundwater table under arboriculture in Northwest Germany, a wide variation of groundwater pollution by pesticides has been observed. We therefore examined data on microbial activity and soil organic matter composition by wet chemistry, cross-polarization magic-angle spinning and 13C nuclear magnetic resonance, and pyrolysis-field ionization mass spectromy. However, neither microbial activity nor the soil organic matter composition of cultivated topsoils explained the differences in xenobiotic leaching into the groundwater. Data from Anthrosols suggested that these soils have a higher capacity for pesticide bonding because of high amounts of aromatic and carboxylic C moieties in the soil organic matter. However, despite the same pesticide inputs and time of application, the leached output from these soils was higher than that from the Podzols. Initial data from subsoil investigations suggest that the presence of a spodic horizon most likely reduces groundwater pollution by pesticides. Studies to assess fixation capacity and desorption kinetics in Bh horison seem warranted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335954
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Synthese, koordinationschemische und massenspektrometrische Charakterisierung neuartiger carboxylsubstituierter N-(Thiocarbamoyl)-benzamidine (1990)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 332 (1990), S. 359-366 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis, Coordination Chemistry and Mass Spectrometric Fragmentation of New N-(Thiocarbamoyl)-benzamidinesSyntheses of N-(thiocarbamoyl)benzamidines from benzimidoylchlorides and aromatic amino acids as starting materials are reported. The prepared compounds were used as ligands for complexing nickel(II) and copper(II)ions. The benzamidines were characterized by mass spectrometric methods. The fragmentation pattern of the benzamidines was derived from the corresponding MIKE-spectra.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19903320313
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  • 4
    Electronic Resource
    Electronic Resource
    Flüssig-Flüssig-Extraktion von Metallionen mit LariatethernHerrn Professor Dr. E. Hoyer zum 60. Geburtstag gewidmet (1991)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 333 (1991), S. 413-421 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Liquid-Liquid-Extraction of Metal Ions with Lariat Ethers.Lariat ethers of various ring size and substitution are synthesized and characterized by physical data and chemical analysis. The extraction behaviour of the crown compounds towards Na+, K+, Cs+ and Ag+ in a picric acid solution has been investigated. The extraction contants for 1:1 and 1:2 complexes are determined using the equilibrium distribution data. The results show that the flexible side chain in the investigated compounds has in no case a positive effect on the metal picrate extraction.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19913330306
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  • 5
    Electronic Resource
    Electronic Resource
    Zur reversiblen Umwandlung von 3-Diethylamino-5-phenyl-1,2,4-dithiazolium-halometallaten in Metallchelate der 3-(Thio)benzoyl(thio)harnstoffeHerrn Prof. Dr. E. Hoyer zum 60. Geburtstag gewidmet (1991)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 333 (1991), S. 537-544 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: About the Reversible Conversion of 3-Diethylamino-5-phenyl-1,2,4-dithiazoliumhalometallates into Metal Chelates of 3-(Thio)benzoyl(thio)ureasRedox reactions of 3-diethylamino-5-phenyl-1, 2,4-dithiazolium halometallates 1a-e and metal chelates (M = CuII (2 A), CoII (2 C), NiII (2 F)) of 3-thiobenzoylthioureat was studied by cyclic voltammetry. 1 are converted by reduction into 2. The mechanism of the oxidation of 2 A, C, F into 1a, d, e is dependent on the central ion.On formation of 1 a from copper(II) chelates of 3-benzoylthiourea 3 A by means of thionylchloride as well as by electrochemical oxidation 3-benzoylureas 4 A are formed as sideproducts.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19913330404
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  • 6
    Electronic Resource
    Electronic Resource
    Säurestärke und Komplexbildung von Curcuminoiden (1988)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 330 (1988), S. 111-118 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Acidity and Complex Formation of CurcuminoidsThe stoichiometric acid dissociation constants of curcumin 1a and derivatives as well as the stoichiometric stability constants of the Cu(II)- and Ni(II)-complexes of these substances have been determined by pH-potentiometric titrations in dioxane-water mixture.The influence of different substituents on the pKa-values and the stability constants is discussed. The complexing properties of the —CO—CH2—CO— structural element of the ligands are not significantly changed when the phenyl group is substituted by the styryl group. Solid CuL2-complexes have been characterized. The coordination of the ester group in the tricarbonyl ligand systems 4 was excluded by i.r. spectroscopy.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19883300120
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  • 7
    Electronic Resource
    Electronic Resource
    Zur Reaktion von N-(N′,N′-Dialkyl(aryl)amino-thiocarbonyl)benzimidoylchloriden mit Kaliumthiocyanat (1988)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 330 (1988), S. 241-247 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reactions of N-(N′,N′-Dialkyl(aryl)amino-thiocarbonyl)benzimidoylchlorides with Potassium ThiocyanateThe treatment of the title compound N-(amino-thiocarbonyl)-benzimidoylchloride 1 with potassium thiocyanate leads in dependence on the solvents (methanol, acetic acid, acetone) either to the 1,3,5-thiadiazine-2-thione 2a-d or to the ring opened isothiocyanate 4a, b. In the case of methanol the N-(amino-thiocarbonyl)benzimidates were formed as by-products.The structure of the products is confirmed by analytical data and by chemical transformations. 2a reacts with methyl iodide to form the 2-methylthio-6-morpholino-4-phenyl-1,3,5-thiadiaziniumiodide 3a. From 4a and water the N-(morpholino-thiocarbonyl)benzamide 5a arises. The reaction of morpholine with 4a yields the benzamidine 6a.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19883300210
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  • 8
    Electronic Resource
    Electronic Resource
    Estergruppen als Liganden in Schwermetallchelaten. III. Komplexbildung mit Estern der o-Mercaptobenzoesäure und der o-Aminobenzoesäure (1967)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 350 (1967), S. 27-34 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition metal ions form crystalline chelates with the methylester of o-mercaptobenzoic acid. The suggested ligand behaviour as a β-thioxoketone with fixed thioenol structure is supported by IR-spectroscopic measurements. The stability of the nickel(II) chelate has been determined by ligand exchange with pyridine and ethylenediamine. Copper(II) chloride and nitrate or perchlorate form 1:1 and 1:2 complexes, respectively, with the methylester of o-aminobenzoic acid, which have been isolated and compared with the mercapto compounds.
    Notes: Übergangsmetallionen reagieren mit o-Mercaptobenzoesäuremethylester unter Bildung Kristalliner Komplexe. IR-spektroskopische Untersuchungen bestätigten die Vermutung, daß sich der Ligand wie ein β-Thioxoketon mit fixierter Thioenolstruktur verhält. Durch Ligandenaustausch gegen Pyridin und Äthylendiamin wurde die Stabilität des Bis-(o-mercaptobenzoesäuremethylester)-nickel(II) untersucht. Zum Vergleich wurden vom o-Aminobenzoesäuremethylester ein 1:1-Komplex mit Kupfer(II)-chlorid und 1:2-Komplexe mit Kupfer(II)-nitrat bzw. -perchlorat dargestellt und die Verschiebungen der C=O-Valenzfrequenz diskutiert.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19673500105
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  • 9
    Electronic Resource
    Electronic Resource
    ESCA-Untersuchungen an Schwermetallchelaten substituierter N-Acyl-thio- und -selenoharnstoffe (1977)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 432 (1977), S. 275-279 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: ESCA Investigations on Heavy Metal Chelates of Substituted N-acyl-thio- and -selenoureasN-acylthio- and -selenoureas give as 1,3-dichalcogenketones stable chelates of heavy metals, which are easy to synthesize. From the measurement of the chemical shifts of the N1s-, S2p- or Se3p- and metal nl-ESCA lines follows, that the bonding between the ligand and the central atom involves a σ-bond of oxygen and a donor bond of sulfur and selenium, with a decrease of the electronic density on S or Se, resp. The appearence of two N1s-signals can be explained by deprotonation, which is necessary for the formation of the complex.
    Notes: Die N-Acyl-thio- und -selenoharnstoffe bilden als 1,3-Dichalkogenketone relativ einfach zugängliche stabile Schwermetallchelate. Aus der Messung der chemischen Verschiebung der N 1s-, S 2p-, bzw. Se 3p- und Schwermetall nl-ESCA-Linien kann man den Schluß ziehen, daß die σ-Bindung des Zentralatoms über den Sauerstoff erfolgt. Die S- und Se-Atome gehen eine dative Bindung ein, wobei sich ihre Elektronendichte erniedrigt. Das Auftreten zweier N-Signale läßt sich durch die bei der Komplexbildung erforderliche Deprotonierung verstehen.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19774320139
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  • 10
    Electronic Resource
    Electronic Resource
    Chelatkomplexe mit N-Benzoylthiobenzamid, N-Benzoylbenzamid und N-Thiobenzoylbenzamidin (1977)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 434 (1977), S. 16-28 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metal Chelates with N-Benzoylthiobenzamide, N-Benzoylbenzamide, and N-ThiobenzoylbenzamidineN-Benzoylthiobenzamide, 1, N-benzoylbenzamide, 2, and N-thiobenzoylbenzamidine-hydrochloride, 3, yield neutral complexes with numerous metal ions which have been characterized by i.r., electronic, and mass spectra as well as magnetic measurements. Compared with the CH2-analogous monothiodibenzoylmethane, H-MTDBM, the isosteric NH group in 1 preferentially influences the properties of the free ligand, e. g. tautomerism, configuration, acidity. ESCA data are used for the discussion of structures and bonding situations of the ligands and its metal complexes.
    Notes: N-Benzoylthiobenzamid, 1, N-Benzoylbenzamid, 2, und N-Thiobenzoyl-benzamidinhydrochlorid, 3, geben mit zahlreichen Metallionen Neutralkomplexe, die durch IR-, UV/VIS- und Massenspektren sowie magnetische Messungen charakterisiert werden. Verglichen mit dem CH2-analogen Monothiodibenzoylmethan, H-MTDBM, wirkt sich die isostere NH-Gruppe in 1 vorwiegend auf die Eigenschaften des freien Liganden (Tautomerie, Konfiguration, Azidität) aus. ESCA-Spektren werden zur Struktur- und Bindungsinterpretation bei Liganden und Metallkomplexen herangezogen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19774340102
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