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  • 1
    Electronic Resource
    Electronic Resource
    1-Amino-4-aryl-2(1H)-pyrimidinthione: Acidität und Komplexbildung mit Mn(II), Co(II), Ni(II), Zn(II), Cd(II), Pb(II) und Ag(I) (1994)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 336 (1994), S. 500-505 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1-Amino-4-aryl-2(1H)-pyrimidinethiones: Acidity and Complex Formation with Nonferrous Metal Ions and Ag(I)Acid dissociation constants of new 2, 3 and already known 1 substituted 1-amino-4-aryl-2(1H)-pyrimidinethiones and stability constants of their nonferrous metal ion and silver complexes have been measured pH-potentiometrically in a 75% (v/v) mixture of dioxane/water. The influence of the substituents on pKa- and lgβn-values is discussed. The X-ray structure analysis of bis[1-(4-toluenesulfonamido)-4-(4-tolyl)-2(1H)-pyrimidinethionatol]-nickel(II)5 proves that pyrimidinethiones coordinate via their thione sulphur and aminonitrogen. However, the bond lengths are not levelled in the chelating ring.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19943360604
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  • 2
    Electronic Resource
    Electronic Resource
    Koordination von Silber(I) durch N,N-Diethyl-N′-benzoylthioharnstoff in Lösung und in festem ZustandProfessor Lothar Beyer zum 60. Geburtstag gewidmet (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 135-140 
    Details
    ISSN: 0044-2313
    Keywords: Ag1 complexes ; N-acyl thiourea complexes ; potentiometry ; stability constants ; X-ray structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Coordination of Silver(I) by N,N-Diethyl-N′-benzoyl Thiourea in Solution and in the Solid StateSilver(I) reacts in dioxane/water solution with N,N-diethyl-N′-benzoyl thiourea HL to give cationic, neutral, and anionic complexes depending on the pH value, the molar ratio of the reactants and their concentrations. The ligand in these complexes coordinates in various ways. Complex stability constants have been determined by pAg and pH potentiometry. Representative complexes have been isolated in the solid state. One of them is a cyclic tetramer [AgL]4 the structure of which has been determined by X-ray diffraction.
    Notes: Silber(I) bildet mit N,N-Diethyl-N′-benzoyl-thioharnstoff HL in Dioxan/Wasser-Mischung, abhängig vom pH-Wert, dem molaren Verhältnis der Reaktanden und ihren Konzentrationen, kationische, neutrale und anionische Komplexe, in denen der Ligand in unterschiedlicher Weise koordiniert. Für diese Komplexe wurden pAg- und pH-potentiometrisch Stabilitätskonstanten bestimmt. Repräsentative Komplexe konnten in festem Zustand isoliert werden, darunter ein cyclischer Komplex [AgL]4, dessen Struktur durch Röntgenbeugung bestimmt wurde.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19976230122
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  • 3
    Electronic Resource
    Electronic Resource
    Hydrophil substituierte N-Acyl-thioharnstoffe  -  Säurestärke und Komplexstabilität in Dioxan/WassergemischenProfessor Kurt Dehnicke zum 60. Geburtstage gewidmet (1991)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 595 (1991), S. 35-43 
    Details
    ISSN: 0044-2313
    Keywords: Copper, nickel complexes of N-acyl-thiourea derivatives ; acid dissociation constants ; complex stability constants ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hydrophilic Substituted N-Acyl-thioureas  -  Acidity and Stability of Complexes in Dioxane/Water MixturesSome derivatives of N-acyl-thioureas containing hydroxy, ester or sulfonic acid groups as well as their copper(II) and nickel(II) complexes have been synthesized. Acid dissociation constants and complex stability constants have been measured pH-potentiometrically in dioxane/water mixtures ranging from 75 to 0% (v/v) dioxane involving main group and subgroup metal ions as well. The partially remarkable changes of the constants in varied solvent mixtures are discussed.
    Notes: Eine Reihe N-Acyl-thioharnstoffe mit Hydroxy-, Ester- oder Sulfonsäuregruppen und ihre Kupfer(II)- und Nickel(II)-Komplexe wurden erstmals synthetisiert und ihre Säuredissoziationskonstanten pH-potentiometrisch in Dioxan/Wassergemischen (Dioxangehalt 75 - 0 Vol.-%) bestimmt. Die Stabilitätskonstanten der Komplexe mit 1-, 2- und 3-wertigen Metallionen aus Haupt- und Nebengruppen des PSE wurden ebenfalls ermittelt. Die z. T. drastischen Veränderungen der Konstanten bei Variation der Lösungsmittelzusammensetzung werden diskutiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19915950106
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  • 4
    Electronic Resource
    Electronic Resource
    Ligand Properties of N-Acyl-thiocarbamic-O-alkylesters - A new class of aza-analogous 1,3-thioxoketones (1995)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 337 (1995), S. 184-188 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A series of six N-benzoyl-thiocarbamic-O-alkylesters (R=Me, Et, i-Pr, Benzyl, n-Hex, n-Dodec; 1-6) has been prepared and characterized. They are weak monoprotic acids. The compounds behave as fairly stable and versatile bidentate (O,S)-chelating ligands towards multivalent metal ions e. g. Ni(II), Cu(II), Pb(II) the stability constants of which have been determined in 75 vol% dioxane/water. The molecular structure of bis(O-ethyl-N-benzoylthiocarbamato)nickel(II) 2a is presented. The coordination of the nickel atom is square planar with the two sulphur atoms in cis position.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19953370141
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  • 5
    Electronic Resource
    Electronic Resource
    Kalorimetrische Untersuchung der Komplexbildung zwischen N-Benzoyl-chalkogeno (O, S, Se) harnstoffen und Metallionen der 4., 5. und 6. Periode des PSE in Dioxan/WassermischungProfessor Eberhard Hoyer zum 60. Geburtstage am 26. Mai 1991 gewidmet (1991)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 600 (1991), S. 37-46 
    Details
    ISSN: 0044-2313
    Keywords: Calorimetry ; complex formation ; N-benzoyl-chalcogeno(O, S, Se)ureas ; main group and subgroup metals ; polarizability ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A Calorimetric Study on Complex Formation of N-Benzoyl-chalcogeno (O, S, Se) ureas and Metal Ions of the 4th, 5th, and 6th Period of the Periodic Table of Elements in Dioxane/Water SolutionEnthalpies of protonation and metal complex formation of 3 analogous N′, N′-diethyl-N-benzoyl-chalcogeno (O, S, Se) ureas have been measured by titration calorimetry. Using known stability constants the reaction entropies have been calculated. The free ligands HL are verified to react as NH-acids which are controlled by entropy. Increasing atomic numbers of the reacting metal ions and of the donor atoms of the ligands heighten the complexation enthalpy. The values of enthalpy can be correlated fairly well with the ionic potential and electric polarizability of the metal ions. The remarkable gain of entropy mainly depends on the high number of lost molecules from the extended solvation shell of the reacting species in the dioxane/water mixture.
    Notes: Protolyse- und Metallkomplexbildungsenthalphien der analogen N′, N′- Diethyl-N-benzoyl-chalcogeno (O, S, Se) harnstoffe wurden titrationskalorimetrisch bestimmt und die zugehörigen Reaktionsentropien berechnet. Die freieren Liganden HL reagieren als NH-Säuren, die Protolyse verläuft entropiekontrolliert. Die Reaktionsenthalpien der Metallkomplexe steigen mit zunehmenden Ordnungszahlen der Metallionen und Donatoratome der Liganden, sie korrelieren mit den Ionenpotentialen und Polarisierbarkeiten der Metallionen. Allgemein hohe Beträge der Reaktionsentropie resultieren aus dem Abbau der im Dioxan/Wassergemisch ausgedehnt vorliegenden Solvathülle der Reaktionspartner und beherrschen in der Mehrzahl der Fälle die Komplexbildung.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19916000106
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  • 6
    Electronic Resource
    Electronic Resource
    Zur Stabilität von PdII-, AuIII- und HgII-Komplexen mit N-Acyl-thioharnstoffen in LösungProfessor Rudolf Taube zum 60. Geburtstage gewidmet (1991)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 603 (1991), S. 33-39 
    Details
    ISSN: 0044-2313
    Keywords: Stability constants ; noble metal ions ; N-acyl-thioureas ; redox behaviour ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Stability of Complexes of PdII, AuIII, and HgII with N-Acyl-thioureasStability constants have been determined pH-potentiometrically from PdII, AuIII, and HgII complexes of 3 different substituted N-acyl-thioureas in a mixture of 75%(v/v) dioxane/water and in water as well. The stabilities are remarkably high (lg βm〉30). They can be arranged in the sequence AuIII≥PdII〉HgII. The complexes of gold(III) can be reduced conveniently to complexes of gold(I). Some noble metal complexes have been prepared and characterized in solid state.
    Notes: Stabilitätskonstanten der PdII-, AuIII -und HgII-Komplexe mit 3 N-Acyl-thioharnstoffen werden pH-potentiometrisch unter Zuhilfenahme von Austauschgleichgewichten in 75 Vol.-% Dioxan/Wassermischung und in rein wäßriger Lösung bestimmt. Die Stabilitäten der Komplexe sind sehr hoch (lgβm〉30) und ergeben die Reihenfolge AuIII≥PdII〉HgII. Die Gold(III)-Komplexe können leicht zu Gold(I)-Komplexen reduziert werden. Mehrere Metallkomplexe wurden in fester Form dargestellt und charakterisiert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19916030106
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