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  • Electronic Resource  (17)
  • 1960-1964  (17)
  • Organic Chemistry  (17)
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  • Electronic Resource  (17)
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  • 1
    Electronic Resource
    Electronic Resource
    Tieffarbige Fluorenchinone (1960)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 43 (1960), S. 1086-1112 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Tetrahydroxytriphenylmethane compounds (aurine dyes and their reduction products) deriving from pyrocatechol are converted easily into deeply coloured substances which can be reduced to colourless leuco-compounds, the reduction and re-oxidation being thermodynamically reversible and furnishing a platinum electrode with a well defined potential. It is shown that these new dyes have the structure of dihydroxyfluorene quinones and diaminofluorene quinones; they are the first fluorene quinones ever described in literature. Several of these substituted fluorene quinones have been obtained in a pure, crystalline state and are characterized by analysis, UV. absorption spectra, IR.-spectra, acid-base indicator behaviour, their oxidation-reduction potential and their ability to form metal complexes.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19600430418
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  • 2
    Electronic Resource
    Electronic Resource
    Schwerlösliche Kalium-Natrium-Dekavanadate Ein neues Fällungsmittel für Natrium (1961)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 44 (1961), S. 859-865 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Solutions with pentavalent vanadium contain between pH 3 and 5,5 only decavanadate ions in the forms of H2V10O284-, HV10O285-, and V10O286-. The cristallized sodium - as well as the potassium decavanadates containing the ions V10O286- and HV10O285- - are highly soluble salts. The double salts {K5NaV10O28,10H2O} and {K4NaHV10O28,10H2O} on the other hand are so sparingly soluble that they can be used for the quantitative precipitation of sodium. Even from solutions with a ratio K : Na = 10000 : 1 the precipitates obtained have an exact stoichiometric composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19610440330
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  • 3
    Electronic Resource
    Electronic Resource
    Die Acidität der Sulfane und die Zusammensetzung wässeriger Polysulfidlösungen (1960)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 43 (1960), S. 1365-1390 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The pure salts Na2S2, K2S2, K2S3, Na2S4, K2S4 and K2S5 have been prepared. Titration curves of these polysulfides in aqueous solution have been obtained with a special streaming apparatus, with which the mixing of the polysulfide solution with HCl and the pH determination of the fresh mixture is accomplished within 10-2 seconds. This time is too short for decomposition of the protonated polysulfide anions into sulfur and monosulfide or H2S respectively to occur. With K2S5 the buffer regions S52- ⇄ HS5- ⇄ H2S5 were obtained readily, furnishing the pK's of H2S5. The solutions of the lower polysulfides, however, do not contain simply the anions present in the lattice of the solid salt. As soon as the solid salts are dissolved disproportionation reactions take place giving rise to mixtures. From the protonation curves of these mixtures - taken with the streaming device mentioned - their composition can be deduced, and it was found that all solutions contain the ions OH-, SH-, S42- and S52-. The ions S22- and S32- were never detected. The equilibrium between mono-, tetra- and pentasulfide has been elucidated and the pK's of H2S4 have been obtained. The results have been checked with photometric measurements on the polysulfide solutions.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19600430521
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  • 4
    Electronic Resource
    Electronic Resource
    Hydroxamatkomplexe III. Eisen(III)-Austausch zwischen Sideraminen und Komplexonen. Diskussion der Bildungskonstanten der Hydroxamatkomplexe (1963)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 46 (1963), S. 1409-1422 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The iron transfer from sideramines to suitably chosen complexones (EDTA and similar compounds) has been studied optically. From the equilibrium constants of such exchange reactions the stability constants of Ferrioxamine B, Ferrioxaminc D1, Ferrioxamine E, Ferrichrom and Ferrichrysin have been deduced. For the results see table 5.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19630460436
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  • 5
    Electronic Resource
    Electronic Resource
    Hydroxamatkomplexe II. Die Anwendung der pH-Methode (1963)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 46 (1963), S. 1400-1408 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The equilibria between acethydroxamic acid and 16 metal cations, and their complexes have been elucidated. For the results see table 1. The complex Formation of desferri-ferrioxamine B and desferri-ferrioxamin E, which are trihydroxamic acids, with various bivalent and trivalent metal ions have been studied in a similar manner. For the results see tables 2 and 3.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19630460435
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  • 6
    Electronic Resource
    Electronic Resource
    Hydroxamatkomplexe I. Die Stabilität der Eisen(III)-Komplexe einfacher Hydroxamsäuren und des Ferrioxamins B (1963)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 46 (1963), S. 1390-1400 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The equilibria between iron(III), acethydroxamic acid, benzhydroxaminc acid, desferri-ferrioxamin B and their iron complexes have been elucidated by combining redox potentials, pH and photometric measurements. For the results see section f above.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19630460434
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  • 7
    Electronic Resource
    Electronic Resource
    Die Acidität des Hydrogensulfidions HS-Herrn Professor Dr. D. Monnier zum 60. Geburtstag gewidmet (1964)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 47 (1964), S. 266-271 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The acidity of the HS- anion is considerably smaller than had been concluded in the extensive investigations of 1946 to 1950. The results obtained 40 years earlier are much nearer the truth. The two pK values of H, S in 1MKC1 and at 20°C are 6,88 ± 0,02 and 14,15 ±0,05.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19640470135
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  • 8
    Electronic Resource
    Electronic Resource
    Stabilitätskonstanten mononuclearer Phosphatokomplexe des Strontiums (1962)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 45 (1962), S. 1171-1183 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The complex formation in homogeneous solution of Sr2+ with various phosphates has been investigated by Schubert's ion exchange method. The total concentration of the metal was 10-6 M and Sr-89 served as tracer. Stability constants of the following mononuclear species are given: SrPO-4, SrHPO4, SrH2PO+4, SrP2O2-7, SrP3O3-10, SrHP3O2-10, SrP3O-;9, SrP4O2-12.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19620450415
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  • 9
    Electronic Resource
    Electronic Resource
    Protonierte Metallkomplexe zweizähniger Liganden (1962)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 45 (1962), S. 1222-1244 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Quite often some of the ligand atoms of a chelating agent are protonated while others simultaneously are attached to a metal cation. Metal-hydrogen-complexes of that kind have usually been neglected in the elucidation of the equilibria between the various metal ions and chelating ligands. A general method is described by which the concentration of these protonated metal complexes can be obtained. The method is applied to the six systems: Cd2+ and Malonate (= Mal2-), Cd2+ and Succinate (= Succ2-), Cd2+ and Trimethylenediamine (= Triam), Cd2+ and Tetramethylenediamine (= Tetram), Hg2+ and Tetramethylenediamine; Hg2+ and Pentamethylenediamine (= Pentam). The stability constants of the following complexes are given: CdMal, CdHMal+, Cd(Mal)22-, CdH(Mal)2-, Cd(HMal)2; CdSucc, CdHSucc2+, Cd(Succ)22-; CdTriam2+, CdHTriam3+; CdTetram2+, CdHTetram3+; HgTetram2+, HgHTetram3+, Hg(HTetram)24+; CdPentam2+, CdHPentam3+, Cd(HPentam)24+.
    Additional Material: 21 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19620450419
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  • 10
    Electronic Resource
    Electronic Resource
    Metallkomplexe mit Polyaminen XII: Mit cis-cis-1,3,5-Triaminocyclohexan (1962)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 45 (1962), S. 2030-2036 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 1:1-metal complexes of cis-cis-1,3,5-triamino cyclohexane (denoted by B) have been investigated. CuII, ZnII and AgI are forming a protonated complex of composition MHB3+ and AgHB2+ respectively, and their stability shows them to be chelates with the cyclohexane ring in the boat form. At higher pH-values deprotonation to MB2+, AgB+ takes place. With silver a bimetallic complex Ag2B2+ is also formed. Complex formation with Ni2+, Co2+ and Cd2+ at equimolecular concentrations of 10-3 M is negligible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19620450640
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