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  • 1
    Electronic Resource
    Electronic Resource
    The Stability of Potassium Permanganate in Alkaline Solutions Containing Telluric Acid (1955)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 77 (1955), S. 5503-5504 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01626a017
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  • 2
    Electronic Resource
    Electronic Resource
    Die Reaktionen der Benzoyl-und Salicoylhydrazone des Vanillins, Furfurols und Zimtaldehyds mit zweiwertigen Ionen der Übergangsmetalle (1973)
    Springer
    Monatshefte für Chemie 104 (1973), S. 963-972 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The reaction of benzoyl and salicoylhydrazones of vanilline, furfural, and cinnamaldehyde with some divalent metal ions of the first transition series is investigated. The structure of the ligand in the solid chelates is studied by IR-spectrophotometry which showed that the ligand is coordinated to the central metal ion through the oxygen atom of the C=O and nitrogen atom of the C=N group. Spectrophotometric, and conductometric studies were carried out to investigate the stoichiometry of the complexes under consideration. The shifts in the C=O and C=N IR-bands are utilised for the determination of the coordination bond length.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00903910
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  • 3
    Electronic Resource
    Electronic Resource
    Die Chelate von Co(II), Ni(II), Cu(II), Zn(II) und Cd(II) mit Malonsäurehydrazid und dessen Arylidenderivaten (1976)
    Springer
    Monatshefte für Chemie 107 (1976), S. 485-493 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The metal chelates formed by the reaction of Co2+, Cu2+, Ni2+, Zn2+, and Cd2+ with malonic hydrazide and its arylidene derivatives are investigated. The i.r.-absorption spectra of the solid compounds supported the tetradentate character of these compounds; they also show that the ligand still attained the keto form. The shift of the C=O, C=N bands is utilized in determining the coordination bond length. The stoichiometry of the metal complexes, as studied by spectrophotometric and conductometric methods, is found to be metal ion: ligand =1∶1. The apparent formation constants of the malonic hydrazide complexes are also determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00906878
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  • 4
    Electronic Resource
    Electronic Resource
    Polarographische Untersuchung des Verhaltens von Phloxin und Rose bengale in Lösungen mit verschiedenen pH-Werten (1976)
    Springer
    Monatshefte für Chemie 107 (1976), S. 605-618 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The polarographic behaviour of pholoxin and rose-bengal is studied in solutions of varying pH. The effect of pH and organic solvents is explained. The waves observed are ascribed to the reduction of the furan and pyrone rings of phloxin at pH≤8 and rose-bengal at pH 4–11. The nature of the waves and the electrode reaction are also investigated. The kinetic parameters are as well determined and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00906766
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  • 5
    Electronic Resource
    Electronic Resource
    Electroreduction of phenol red, chlorophenol red and bromophenol red in buffer solutions at DME (1981)
    Springer
    Monatshefte für Chemie 112 (1981), S. 293-299 
    Details
    ISSN: 1434-4475
    Keywords: Electrode reaction ; Kinetic parameters ; Phenol red, bromo-, chloro- ; Polarography ; Reduction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die polarographischen Reduktionen wurden in gepufferten wäßrigen Lösungen und in Alkohol—Wasser-Mischungen über einen weitenpH-Bereich (2–12) durchgeführt. Es zeigte sich, daß in allen drei Fällen die Reduktion über zwei irreversible Ein-Elektron-Wellen gleicher Höhen bei allenpH-Werten vor sich ging. Die Kinetik der Elektrodenreaktion wird diskutiert.
    Notes: Abstract The polarographic reduction of phenol red, chlorophenol red and bromophenol red has been investigated in buffered aqueous solutions and alcohol-water water mixtures over a widepH range (2–12). The results show that the three depolarizers are reduced through two irreversible one-electron waves of equal heights at allpH values. The two waves represent the reduction of the triphenylmethane carbon centre. The nature of the waves and the kinetics of the electrode reaction are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00900760
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  • 6
    Electronic Resource
    Electronic Resource
    The catalytic conversion ofn-pentanol to dialkylether by some cation-exchanged montmorillonite catalysts (1986)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 4 (1986), S. 185-189 
    Details
    ISSN: 1573-1111
    Keywords: Montmorillonite ; heterogeneous catalysis ; alcohol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The heterogeneous catalytic conversion ofn-pentanol to dialkylether was carried out using untreated cation-exchanged montmorillonites and using samples which had been preheated at 300°C in an atmosphere of air, hydrogen or nitrogen. The catalyst has been characterized by applying thermogravimetric analysis, X-ray diffraction and cation exchange capacity tests. Gas-chromatographic analysis of the products showed that the catalytic reactivity of the exchanged montmorillonite is related to the cation radius. The catalytic conversion ofn-pentanol by organometallic complexes of either Al3+/Fe3+-montmorillonites with benzidine has been doubled compared with the catalytic conversion in the absence of benzidine. This may be attributed to the catalytic effect of benzidinium mono- or di-radical cations that enhance the conversion ofn-pentanol to alkene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00655933
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  • 7
    Electronic Resource
    Electronic Resource
    Spectrophotometric study of the reaction of Co(II) and Ni(II) with nitroso-R-salt and α-nitroso-β-naphthol (1980)
    Springer
    Monatshefte für Chemie 111 (1980), S. 1413-1425 
    Details
    ISSN: 1434-4475
    Keywords: Complex formation constants ; Conductometric titration ; IR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurden die Komplexe von Co(II) und Ni(II) mit Nitroso-R-Salz mittels konduktometrischer und spektrophotometrischer Methoden in Puffer-Lösungen mit verschiedenempH untersucht. Für Co(II) wurden (1∶1)-, (1∶2)- und (1∶3)-Komplexe gefunden, während für Ni(II) lediglich (1∶1)- und (1∶2)-Komplexe (Metall:Ligand) festgestellt werden konnten. Die Faktoren, die die Komplexierung bestimmen, werden diskutiert und die Komplexbildungskonstanten wurden bestimmt. Die IR-Spektren der Komplexe mit α-Nitroso-β-naphthol zeigen, daß der Ligand in der Nitrosophenol-Form vorliegt und daß die Reaktion über eine Protonenverschiebung von der OH-Gruppe verläuft.
    Notes: Abstract The complexes of Co(II) and Ni(II) with nitroso-R-salt are studied by conductometric titration and spectrophotometric methods in buffer solutions of differentpH. The study proved the possible formation of (1∶1), (1∶2) and (1∶3) complexes for Co(II) while Ni(II) forms (1∶1) and (1∶2) complexes (metal:ligand) only. The factors affecting complex formation are established and the formation constants of the complexes are evaluated. The ir spectra of the solid complexes with α-nitroso-β-naphthol revealed that the ligand exhibits the nitrosophenol structure and that the reaction takes place through proton displacement from the OH-group.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00903667
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  • 8
    Electronic Resource
    Electronic Resource
    Chelation of somebisazophenyl-β-diketone derivatives with lanthanide metal ions (1997)
    Springer
    Monatshefte für Chemie 128 (1997), S. 423-430 
    Details
    ISSN: 1434-4475
    Keywords: Lanthanide(III) chelates ; Bisazo-β-diketone ; Conductometry ; Potentiometry ; Spectrophotometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Das Komplexierungsverhalten einigerBisazophenyl-β-diketone mit La, Ce, Nd, Sm, Gd, Er und Lu wurde untersucht. Zusammensetzung und Stabilitätskonstanten der Chelate wurden mit konduktometrischen und potentiometrischen Methoden bestimmt. Zur Charakterisierung der Komplexe wurden UV/Vis-, IR- und1H-NMR-Spektroskopie sowie molare Leitfähigkeit, Elementaranalyse und thermische Analyse herangezogen.
    Notes: Summary The chelation behaviour ofbisazo-β-diketone compounds with La, Ce, Nd, Sm, Gd, Er, and Lu ions was investigated. Composition and stability constants of the chelates have been determined by conductometric and potentiometric techniques. Electronic absorption, IR, and1H NMR spectra as well as molar conductance and elemental and thermal analyses were used to characterize the complexes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00806853
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  • 9
    Electronic Resource
    Electronic Resource
    Structural Studies of Cu(II) Chelates with Some Arylidene Derivatives of Benzilic Hydrazide (1998)
    Springer
    Monatshefte für Chemie 129 (1998), S. 19-29 
    Details
    ISSN: 1434-4475
    Keywords: Keywords. Copper chelates; Hydrazones; Benzilic hydrazides.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung.  Die Cu(II)-Chelate einiger neuer Arylidenderivate des Benzilsäurehydrazids wurden synthetisiert und mittels Elementaranalyse, Thermogravimetrie und Differentialthermoanalyse sowie IR-, UV/Vis-, ESR- und Röntgenspektroskopie untersucht. Die erhaltenen Daten zeigen, daβ tetraedrische 1:1- und quadratisch-planare 2:1- und 1:2-Komplexe gebildet werden. In den 1:1-Komplexen verhalten sich die organischen Verbindungen wie dibasische dreizähnige Liganden, während sie in den 1:2- und 2:1-Komplexen in monobasischer zweizähniger Form vorliegen.
    Notes: Summary.  The Cu(II) chelates of some new arylidene derivatives of benzilic hydrazide have been synthesized and were characterized by elemental and thermal analyses, as well as by IR, UV/Vis, ESR, and X-ray spectroscopy. The data revealed the formation of tetrahedral 1:1 (L :M) and square planar 2:1 and 1:2 complexes. In the 1:1 complexes, the organic compounds behave as dibasic tridentate ligands towards the Cu(II) ion, whereas in the 1:2 or 2:1 complexes they behave as monobasic bidentate substituents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00010100
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  • 10
    Electronic Resource
    Electronic Resource
    Polarographic analysis. I (1960)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 174 (1960), S. 254-260 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Reduction of CuII in 0.5 M NaOH containing triethanolamine proceeds irreversibly. A similar behaviour is observed in acetate buffer of pH 6. A reversible wave is obtained in (NH4)2CO3 containing EDTA. The diffusion current measured at the proper voltage is proportional to the CuII concentration within a wide range. The waves in 0.5 M NaOH are not well developed being better in acetate buffer and in the presence of EDTA. Ammoniacal solutions containing EDTA can be utilised for the simultaneous estimation of FeIII and CuII. A mixture of FeIII, CuII and UVI can be fairly well analysed in a medium of (NH4)2CO3 containing EDTA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00454042
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