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  • 1970-1974  (13)
  • 1930-1934  (2)
Collection
Keywords
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Sittampundi and Fiskenaesset chromiferous suites — Stratiform or Alpine? (1971)
    Springer
    Mineralium deposita 6 (1971), S. 156-157 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00206628
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  • 2
    Electronic Resource
    Electronic Resource
    Die qualitative Analyse von Mischungen von Ferrocyanid, Ferricyanid und Rhodanid (1930)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 82 (1930), S. 378-379 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01361596
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  • 3
    Electronic Resource
    Electronic Resource
    Dissociation of Tris-Oxinatochromium(III) in acid medium: Evalutation of equilibrium constants (1970)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 374 (1970), S. 108-112 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Es wurden die Gleichgewichtskonstanten der stufenweisen Dissoziation von Chrom(II1)-tris-oxinat in saurer 50 vol.-proz. Alkohol- Wasser-Lösung nach der BJERRUM-Methode ermittelt. Da auch bis herunter zu pH ≍ 1,9 keine weitere Disso-ziation als bis zum Mono-oxinatokomplex erfolgt, konnten nach dieser Methode K′ und K″ der beiden ersten Dissoziationsstufen bestimmt werden (Daten s. “Abstract”).
    Notes: The equilibrium constants for the stepwise dissociation of tris-oxinato-chromium(II1) in 50 per cent (v/v) aqueous-alcoholic acidic medium have been evaluated from pH measurements using BJERRUM's method. Even down to a pH ca. 1.9 no perceptible dissociation beyond the stage of the mono-oxinato complex takes place; hence only the equilibrium constants for the first two stages, namely tris- to bis- and bis- to mono-, could be evaluated by this method. At 35°C (μ, 0.1) the values are \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {{\rm K' = }{{\left[{{\rm CrL}_{\rm 2}^{\rm + } } \right]\left[{{\rm LH}} \right]} \mathord{\left/ {\vphantom {{\left[{{\rm CrL}_{\rm 2}^{\rm + } } \right]\left[{{\rm LH}} \right]} {\left[{{\rm CrL}_{\rm 3} } \right]}}} \right. \kern-\nulldelimiterspace} {\left[{{\rm CrL}_{\rm 3} } \right]}}\left[{{\rm H}^{\rm + } } \right] = 6.6 \cdot 10^{ - 3} } \hfill \\ {{\rm K'' = }\left[{{\rm CrL}^{{\rm 2 + }} } \right]{{\left[{{\rm LH}} \right]} \mathord{\left/ {\vphantom {{\left[{{\rm LH}} \right]} {\left[{{\rm CrL}_{\rm 2}^{\rm + } } \right]}}} \right. \kern-\nulldelimiterspace} {\left[{{\rm CrL}_{\rm 2}^{\rm + } } \right]}}\left[{{\rm H}^{\rm + } } \right] = 2.5 \cdot 10^{ - 4} } \hfill \\\end{array} $$\end{document} where LH = oxine (8-quinolinol), C9H7NO.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19703740116
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  • 4
    Electronic Resource
    Electronic Resource
    Kinetics and mechanism of dissociation of bis(biguanide)-Palladium(II) Ion in HCl—NaCl Medium (1972)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 393 (1972), S. 295-300 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Kinetik und Mechanismus der Dissoziation des Bis(Biguanid)palladium(II)-Ions in HCl-NaCl-Lösungen.Die Kinetik der stufenweisen Dissoziation des Bis(biguanid)-palladium(II)-Ions in HCl-NaCl-Lösungen wurde spektrophotometrisch untersucht. Der erste Schritt in schwach saurer Lösung (0,01-0,1 m HCl) führt zur Bildung von Dichloromonobiguanid-palladium(II), der zweite Schritt in stärker saurer Lösung (0,15-0,4 m HCl) zum Tetrachloropalladat(II)-Ion. Bei jeder Stufe liegen zwei Konkurrenzreaktionen vor, eine von erster Ordnung, die andere von zweiter Ordnung.Die einzelnen Geschwindigkeitskonstanten und die entsprechenden Werte von ΔH≠ und ΔS≠ wurden ermittelt, ein möglicher Reaktionsmechanismus wird diskutiert.
    Notes: The kinetics of the stepwise dissociation of bis(biguaniide)palladium (II) ion in HCl - NaCl media have been studied spectrophotometrically. The first step leads to the formation of dichloromono(biguanide)palladium(II) at low acid concentrations (0.01-0.1 M HCl); the second step leads to the formation of tetrachloropalladate(II) ion at higher acid concentrations (0.15-0.4 M HCl). There are two concurrent reaction paths in each step, one of which is first order with respect to both H+ and Cl- ion concentrations, while the other is second order with respect to both. The individual rate constants have been evaluated, as well as the corresponding activation parameters, ΔH≠ and ΔS≠, and possible mechanisms have been discussed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19723930313
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  • 5
    Electronic Resource
    Electronic Resource
    Kinetics and Mechanism of Formation of Tetrahaloplatinate(II) Ion in the Reactions of Bis (oxalato)-platinate(II) Ion with Chloride and Bromide Ions in Acid Media (1973)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 401 (1973), S. 189-194 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Kinetik und Mechanismus der Bildung des PtX42- -Ions bei den Reaktionen des Bis(oxalato) platin(II)-Ions mit Chlorid- und Bromid-Ionen in wäßrigem MediumDie Geschwindigkeit der Überführung des Bis(oxalato)platin(II)-Ions, Pt(Ox)22-, in das Tetrahalogenoplatin(II)-Ion, PtX42- (X = Cl, Br), in saurem, die Halogenid-Ionen enthaltendem Medium wurde spektroskopisch untersucht. Das beobachtete Geschwindigkeitsgesetz folgt: {k′ + k″[H+]} [X-][Pt(Ox)22-]. Die Werte für k′ und k″ wurden ermittelt. Die Ergebnisse stehen mit einem Mechanismus in Übereinstimmung, bei dem die Assoziation des X- am Pt(Ox)22- gefolgt von der Dissoziation eines Oxalat-Liganden auf von H+-Ionen unabhängigen bzw. abhängigen Wegen angenommen wird. Die schnelle Anlagerung von X- an Pt(Ox)X- ergibt ein Zwischenprodukt Pt(Ox)X22-, bei welchem das Oxalat schnell durch X--Ionen zum PtX22- ersetzt wird unter dem Transeinfluß der schon gebundenen X--Liganden.
    Notes: The rate of transformation of bis(oxalato)platinate(II) ion, Pt(Ox)22-, into tetrahaloplatinate(II) ion, PtX42-, in acid media containing the halide ion (X- = Cl-, Br-) has been investigated spectrophotometrically. The observed rate law is: Rate = {k′ + k″[H+]} [X-][Pt(Ox)22-]. Activation parameters corresponding to k′ and k″ have been evaluated. The results are consistent with a mechanism which involves association of X- with Pt(Ox)22- followed by dissociation of an oxalate ligand through acid independent and acid dependent paths. Fast addition of X- to the Pt(Ox)X- gives an intermediate Pt(Ox)X2-2 from which the oxalate is replaced in a fast step by X- ions under the trans influence of the bound X- ligands forming the product PtX42-.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19734010210
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  • 6
    Electronic Resource
    Electronic Resource
    Spectrophotometric (U.V.) investigation on Metal Biguanidinium Complexes (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 406 (1974), S. 124-128 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: UV-spektroskopische Untersuchung von Metall-Biguanidin-KomplexenAus der UV-spektroskopischen Untersuchung einer Reihe von Metall-Biguanidinen wurde versucht, eine Wechselwirkung zwischen dem vollem Liganden-Orbital und dem leeren Metall-Orbital zu finden, das zum Ansteigen der Delokalisierung des Elektronensystems der ganzen Molekel führen könnte. Diese Art der Wechselwirkung könnte einen aromatischen Charakter im Metall-Biguanidin-Ring hervorrufen. Der benzoide Charakter der Metall-Acetylacetonate stellt eine Parallele zu dem der Metall-Biguanidine dar. Die Untersuchung der Metall-Biguanidine im UV zeigt, daß es klare Hinweise für die Überlappung der Liganden- und Metall-Orbitale gibt, die mit einer Verschiebung der Absorptionsbanden verbunden ist.
    Notes: From the U.V. spectra study of series of metal biguanides, attempt has been made to find out any interaction between the filled ligand orbital with the vacant metal orbital which may give rise to delocalisation of electron system over the whole complex molecule. This type of interaction may develop aromatic character in metal biguanide ring. The benzenoid character of the metal acetylacetonate can be cited as parallel to that of the metal biguanide. The U.V. study of metal biguanides concludes that there is a definite indication of the suggested overlap of the ligand and metal orbitals with consequent shifting of absorption bands with different substitutions.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744060118
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  • 7
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    Die qualitative Analyse von Mischungen von Ferrocyanid, Ferricyanid und Rhodanid (1930)
    Springer
    Details
    Publication Date: 1930-10-01
    Print ISSN: 0016-1152
    Topics: Chemistry and Pharmacology
    Published by Springer
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  • 8
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    Effective pair potentials for liquid Na and liquid K (1974)
    American Institute of Physics
    Details
    Publication Date: 1974-04-01
    Print ISSN: 0021-9606
    Electronic ISSN: 1089-7690
    Topics: Chemistry and Pharmacology , Physics
    Published by American Institute of Physics
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  • 9
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    Comparison of the interionic potential in alkali metals with effective pair potential for liquid Na and liquid K (1974)
    American Institute of Physics
    Details
    Publication Date: 1974-06-15
    Print ISSN: 0021-9606
    Electronic ISSN: 1089-7690
    Topics: Chemistry and Pharmacology , Physics
    Published by American Institute of Physics
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  • 10
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    Correlation of Precambrian Ore provinces of East Africa, India and West Australia (1972)
    Society of Economic Geologists
    Details
    Publication Date: 1972-02-01
    Print ISSN: 0361-0128
    Electronic ISSN: 1554-0774
    Topics: Geosciences
    Published by Society of Economic Geologists
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