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  • Articles  (32)
  • Chemistry  (32)
  • Inorganic Chemistry  (27)
  • Bis(1, 3-diketonato)cobalt-bisimidazoles
  • [Li(TMED)2][Co(COD)2]
  • Wiley-Blackwell  (32)
  • 1985-1989  (15)
  • 1980-1984  (17)
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  • Articles  (32)
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  • Wiley-Blackwell  (32)
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  • 1
    Electronic Resource
    Electronic Resource
    O- und N-alkylsubstituierte 2-(2′-Hydroxyphenyl)-benzimidazole und -1,3,4-oxadiazole als Komplexbildner und Extraktionsmittel für Kupfer-II-ionen (1983)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 325 (1983), S. 708-718 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: O- and N-Alkylsubstituted 2-(2′-Hydroxyphenyl)-benzimidazoles and -1,3,4-Oxadiazoles as Complexing and Extracting Agents for Copper-II-Ions2-(2′-Alkoxyphenyl)-benzimidazoles 1, 1-alkyl-2-(2′-hydroxyphenyl)-benzimidazoles 2, 2-(2′hydroxy-4′-alkoxyphenyl)-benzimidazoles 3, 2-(2′,4′-dialkoxyphenyl)-benzimidazoles 4 and 1-alkyl-2-(2′-hydroxy-5′-nitrophenyl)-benzimidazoles 7 are synthesized by condensation of 2-hydroxybenzoic acid derivatives and o-phenylenediamine or its derivatives. Alkyl chains C4, C8 or C12 are introduced by alkylation before or after the ring closure in order to increase the solubility of the reagent in toluene or n-octane. Furthermore the extraction properties of the benzimidazoles are investigated. Also some new analogous compounds of the benzothiazole and the 1,3,4-oxadiazole series were synthesized.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19833250505
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  • 2
    Electronic Resource
    Electronic Resource
    Hoyer, E.; Beyer, L.; Dietze, F.; Seifert, W.; Wagler, D.: Säuren und Basen - Lehrprogrammbuch. Aufl., 95 S., Leipzig: VEB Deubscher Verlag f. Grundstoffindustrie 1987.16,- Mark (1989)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 331 (1989), S. 684-684 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19893310421
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  • 3
    Electronic Resource
    Electronic Resource
    Komplexchemisches Verhalten von N-substituierten 2-(o—Hydroxyphenyl)-Δ2-imidazolinen als Metallextraktionsmittel (1983)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 325 (1983), S. 211-224 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The Coordinative Behaviour of N-Substituted 2-(Δ2-Imidazolin-2-yl)-phenols as Metal ExtractantsN-Substituted 2-(Δ2-imidazolin-2-yl)-phenols (R4NNOH) are obtained by the reaction of N-alkyl diaminoethane-1, 2 and 2-hydroxybenzoic acid esters. In contrast to many other copper(II) complexes with the donor set N2O22-(A), the species Cu(R4NNO)2(B) are easily soluble in nonpolar solvents. The reason is the monomeric square-planar structure of B, which differs from the polymeric distorted octahedral structure of A.The two maxima in the vis-spectra of Cu(R4NNO)2 and Ni(R4NNO)2 are assigned to the 3 dxy → 3 dx2-y2 and the 3 dxz, 3 dyz → 3 dx2-y2 electron transitions. The shift of these maxima, which is connected with the dissolution in chloroform, is explained by the formation of hydrogen bonds between the solvent and the N-alkylated nitrogen atoms of the ligands.1H-n. m. r.-spectra and solubility of the ligands and the crystal structure of Cu[(C4H9)NNO]2 are described.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19833250206
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  • 4
    Electronic Resource
    Electronic Resource
    The electro-osmotic actuation of implantable insulin micropumps (1983)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 17 (1983), S. 931-943 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: A study using an electro-osmotic cell suitable for actuating an implantable insulin micropump showed that controlled variable flow rates in the order of 0.2 mL/day are possible. The cell functioned continuously with low energy and power requirements and long service life. The principle of operation is compatible with achieving the very low flow rates necessary if highly concentrated insulin is to be used to avoid frequent insulin reservoir refilling. An electro-osmotic cell, Ag/ AgCl/NaCl(aq)/ cation exchange membrane/NaCl(aq)/ AgCl/ Ag, was connected to a constant current power supply which reversed the direction of the current every 10 mins causing a to-and-fro transport of fluid through the membrane. Flow rates of 0.15-0.60 μL/min were achieved with currents of 2.5-10 mA. At the low flow rate, energy consumption was 6.4 × 10-2 J/μL and peak power requirement was 〈2.0 × 10-4 W. Fluid was transported against a pressure gradient of 52 cm Hg. The cell contained a total electrolyte volume of 〈0.25 mL. The membrane showed no change in properties after 10,000 current reversals (69 days). To function as an actuator for an implantable insulin micropump, the electro-osmotic cell requires a switching and valving assembly; a suitable design for this is briefly considered.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820170605
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  • 5
    Electronic Resource
    Electronic Resource
    Substituierte 2-(Thiazol-4-yl)-phenole als Liganden und potentielle Extraktionsmittel für Kupfer(II)Professor Günther Schott zum 60. Geburtstage am 29. April 1981 gewidmet (1981)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 476 (1981), S. 16-22 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Substituted 2-(Thiazol-4-yl)-phenols as Ligands and Potential Extractants for Copper (II)Substituted 2-(thiazol-4-yl)-phenols are obtained by the HANTZSCH synthesis. Their solubility in toluene is higher than in n-octane depending on the position, the chain length, and the polarity of the substituents. From alcoholic solutions complexes of the type CuL2n are precipitated. According to the substituents their structure is distorted octahedral (CuL22, CuL23) or distorted tetrahedral (CuL28, CuL29). The new complexes are nearly insoluble in toluene and aliphatic hydrocarbons, but CuL28 and CuL29 are soluble in chloroform. Therefore copper(II) may be extracted by HL8 and HL9 using chloroform as a diluent.
    Notes: Durch die HANTZSCHsche Synthese werden substituierte 2-(Thiazol-4-yl)-phenole HLn hergestellt. Ihre Löslichkeit ist in Toluen besser als in n-Octan und hängt von der Stellung, der Kettenlänge und der Polarität der Substituenten ab. Aus alkoholischen Lösungen kristallisieren Komplexe des Typs CuL2n. Je nach den Substituenten ist ihre Struktur verzerrt oktaedrisch (CuL22, CuL23) oder verzerrt tetraedrisch (CuL28, CuL29). Alle neu dargestellten Kupfer(II)-Komplexe sind in Toluen und aliphatischen Kohlenwasserstoffen schwer löslich. Dagegen lösen sich die Verbindungen CuL28 und CuL29 gut in Chloroform. Kupfer(II) kann daher mit HL8 und HL9 in Chloroform als Verdünnungsmittel extrahiert werden.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19814760503
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  • 6
    Electronic Resource
    Electronic Resource
    Zur Oxydation von Gemischtligand-Nickel(0)-Komplexen mit organischen Halogeniden (1981)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 477 (1981), S. 167-177 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Oxidation of Mixed Ligand Nickel(0) Complexes by Organic HalidesThe oxidation of (dipy)Ni(PPh3)2 by alkyl and aryl iodides or bromides affords the nickel(I) complexes (dipy)Ni(PPh3)X (X = Br, I). No normal products of oxidative addition are obtained. But in the case of methyl and ethyl halides complexes of the type (dipy)NiR2 are formed as intermediates. Basing on the identified final products and on the correalation between the reactivity of the organic halides and their polarographic half wave potentials a mechanism of the reaction is proposed. The first step is a charge transfer from nickel(0) to the organic halide.Further synthesis, reactions, and the ESR-spectra of the complexes (dipy)Ni(PPh3)X and a synthesis of (dipy)Ni(CH2Ph)2 are described. Experiments to prepare pure (dipy)Ni(PPh3)Cl had no success.
    Notes: (dipy)Ni(PPh3)2 wird von Alkyl- und Aryliodiden bzw. -bromiden zu den Nickel(I)-Verbindungen (dipy Ni(PPh3)X (X = I, Br) oxydiert. Normale Produkte der oxidativen Addition werden nicht gefunden. Im Falle der Methyl- bzw. Ethylhalogenide entstehen jedoch Komplexe des Typs dipy)NiR2 als Intermediate. Auf Grund der identifizierten Endprodukte und der Zusammenhänge zwischen der Reaktivität der organischen Halogenide und ihrer polarographischen Halbstufenpotentiale wird ein Reaktionsmechanismus vorgeschlagen, an dessen Anfang ein Chargetransfer vom Nickel(0)-Komplex zum organischen Halogenid steht.Es werden weitere Synthesemöglichkeiten, Reaktionen und die ESR-Spektren der Komplexe (dipy)Ni(PPh3)X sowie die Synthese von (dipy)Ni(CH2Ph)2 mitgeteilt. Die Darstellung von reinem (dipy)Ni(PPh3)Cl gelang nicht.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19814770623
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  • 7
    Electronic Resource
    Electronic Resource
    Flüssig-Flüssig-Extraktion von Metallen mit vierzähligen Schiffschen Basen (1982)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 490 (1982), S. 147-152 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Liquid-Liquid Extraction of Metals with Some Tetradentate Schiff BasesThe liquid-liquid extraction of copper(II), iron(III), nickel(II), cobalt(II), and zinc(II) with some tetradentate Schiff bases HO∩N∩N∩OH has been investigated. The extraction is strongly influenced by changing the size of the chelate ring. From slope analysis, the extracted species are found to be neutral complexes MII (O∩N∩N∩O) in the case of bivalent metal ions. Iron(III) forms chloride containing complexes in the organic phase. The complex behaviour of these Schiff bases in the solid state has been compared with the complex formation in solution.
    Notes: Es wird über die Flüssig-Flüssig-Extraktion von Kupfer(II), Eisen(III), Nickel(II), Cobalt(II) und Zink(II) mit vierzähligen Schiffschen Basen HO∩N∩N∩OH berichtet. Der Extraktionsvorgang hängt stark von der Gestalt der gebildeten tricyclischen Komplexe ab. Im Falle der zweiwertigen Metallionen werden, wie die Slope-Analyse zeigt, die Chelate MII (O∩N∩N∩O) extrahiert. Eisen(III) bildet in der organischen Phase chloridhaltige Komplexe. Die Komplexbildung der Schiffschen Basen in Lösung wird mit der im festen Zustand verglichen.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19824900118
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  • 8
    Electronic Resource
    Electronic Resource
    Benzylnickel(II)-Komplexe und ihre Reaktionen (1984)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 510 (1984), S. 11-15 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Benzyl Nickel(II) Complexes and their ReactionsBy the oxydative addition of p-substituted benzyl chlorides to (Ph3P)2Ni(C2H4) at -20°C the violet nickel(II) complexes (Ph3P)2Ni(p-CH2C6H4R)Cl (R = CN, COOH, CH3, Cl) are, formed. In water containing solutions the carbonic acid (Ph3P)2Ni(p-CH2C6H4COOH)Cl is rearranged to the corresponding p-methylbenzoate.With carbon dioxide the complexes (Ph3P)2Ni(p—CH2C6H4R)Cl react like Grignard compounds. Diphenyl ethine and butadien-1,3 are inserted in the Ni - C bond at room temperature. Substituted nickel-σ-vinyl or π-allyl complexes are obtained. The reactivity of the nickel-σ-benzyl compounds is compared with that of other nickel(II)-alkyl compounds.
    Notes: Die oxydative Addition von p-substituierten Benzylchloriden an (Ph3P)2—Ni(C2H4) bei -20°C ergibt die violetten Nickel(II)-Komplexe (Ph3P)2Ni(p—CH2C6H4R)Cl (R = CN, COOH, CH3, Cl). Die Carbonsäure (Ph3P)2Ni(p—CH2C6H4COOH)Cl lagert sich in Gegenwart von Wasser in das entsprechende p-Methylbenzoat ein.Die Verbindungen des Typs (Ph3P)2Ni(p—CH2C6H4R)Cl reagieren mit Kohlendioxid grignardanalog. Diphenylethin und Butadien-1,3 werden bei normaler Temperatur in die Ni - C-Bindung eingeschoben. Dabei entstehen substituierte Nickel-σ-vinyl- bzw. π-allyl-Komplexe. Das Reaktionsverhalten der Nickel-σ-benzylverbindungen wird mit dem anderer Nickel(II)-alkylverbindungen verglichen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19845100303
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  • 9
    Electronic Resource
    Electronic Resource
    Metallextraktion und Komplexbildung mit α-Aminoximen (1984)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 518 (1984), S. 187-196 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metal Extraction and Complex Formation by α-Amino OximesCyclic secondary α-amino oximes (RNHR′NOH) in toluene as a diluent extract copper(II) from weakly acid solutions. The distribution ratio DCu amounts to 80. The extraction process is connected with the elimination of two protons (formation of [Cu(RNHR′NOH)2—H]NO3). Apart from this 1,2-complex 1,1-complexes Cu(RNHR′NOH)X2 (X = Cl, Br) are obtained. A blue and a black isomer of Cu(RNHDodNOH)Cl2 are described. According to x-ray structure analysis, the latter isomer is square-planar with the amino oxime in the E-configuration. Basing on the i.r. spectrum, for the blue isomer a monodentate coordination of the Z-isomer of RNHDodNOH is discussed.In the case of nickel(II) only the 1,2-chelates [Ni(RNHR′NOH)2—H]Y (Y = NO3, ClO4, I), in the case of palladium(II) only the 1,1-chelates Pd(RNHR′NOH)Cl2 were isolated.
    Notes: Cyclische sekundäre α-Aminoxime (RNHR′NOH) im Verdünnungsmittel Toluen extrahieren Kupfer(II) aus schwach saurer Lösung. Das Verteilungsverhältnis DCu kann bis auf 80 ansteigen. Der Extraktionsprozeß ist mit der Abspaltung von zwei Protonen verbunden (bevorzugte Bildung von [Cu(RNHR′NOH)2—H]NO3 (A)).Neben den 1,2-Komplexen A bildet Kupfer(II) noch die 1,1-Komplexe Cu(RNHR′NOH)X2 (X = Cl, Br). Von Cu(RNHDodNOH)Cl2 existieren ein blaues und ein schwarzes Isomer. Das letztere ist nach den Kristallstrukturanalyse planar-quadratisch und enthält das α-Aminoxim in der E-Konfiguration. Das IR-Spektrum der blauen Form läßt den Schluß auf eine einzählige Koordination von RNHDodNOH als Z-Isomer zu.Bei Nickel(II) und Palladium(II) konnte mit [Ni(RNHR′NOH)2—H] (Y = NO3, ClO4 I) bzw. Pd(RNHR′NOH)Cl2 jeweils nur ein Komplextyp isoliert werden.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19845181119
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  • 10
    Electronic Resource
    Electronic Resource
    Oxydation von Nickel(0)-Komplexen mit cyclischen Carbonsäureamiden (1985)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 530 (1985), S. 196-206 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Oxidation of Nickel(0) Complexes by Cyclic Imides of Dicarbonic AcidsNormally, phthalimide (PI—H) or succinimide (SI—H) react with nickel(0) complexes  -  (dipy)Ni(COD) or (Ph3P)2Ni(C2H4)  -  by oxidative addition. The reaction of PI—H and the strong reductant (dipy)Ni(COD) is initiated by a one-electron transfer. Depending on the solvent, the resulting ion pair affords (dipy)NiI(PI) by spontaneous fragmentation or (dipy)NiII(H)(PI) by cage collaps. No interaction is found between the weak reductant (Ph3P)Ni(C2H4) and PI—H.Phosphine-containing nickel(0) complexes are electrophilically attacked by the acid NH group of SI—H. Hydrido complexes of nickel(0), such as (Cy3P)2Ni(H)(SI), or secondary products of them, such as [(SI)Ni(THF)]2NH, are formed. On the other hand, the reaction with (dipy)Ni(COD) affords only the binuclear substitution product [(dipy)Ni]2(SI—H)(THF).In solution prolongated heating of (dipy)Ni(PI)(THF)0,5 results in a partial decarbonylation. In contrast to the reaction of (dipy)Ni(COD) and cyclic carbonic acid anhydrides, no definite metalla rings but by an interaction with the solvent, benzamide is formed.With (dipy)Ni(COD) maleinimide does not react like on NH-acidic compound but like a polar olefine by substitution.
    Notes: Phthalimid (PI—H) und Succinimid (SI—H) reagieren mit Nickel(0)-Komplexen wie (dipy)Ni(COD) oder (Ph3P)2Ni(C2H4) normalerweise unter oxydativer Addition. Der Startschritt besteht im Falle von PI—H, wenn das starke Reduktionsmittel (dipy)Ni(COD) angeboten wird, in einer Einelektronenübertragung. Das entstandene Ionenpaar unterliegt je nach dem verwandten Lösungsmittel der spontanen Fragmentierung oder einem Käfigkollaps (Bildung von (dipy)NiI(PI)(THF) oder (dipy)Ni(H)(PI)). Das schwächere Reduktionsmittel (Ph3P)2Ni(C2H4) setzt sich mit PI—H nicht um.Die Reaktion von phosphinhaltigen Nickel(0)-Komplexen mit SI—H wird durch einen elektrophilen Angriff des aciden Wasserstoff auf den Komplexrumpf eingeleitet. Es entstehen Hydridokomplexe des Nickel(II), z. B. (Cy3P)2Ni(H)(SI), bzw. deren Folgeprodukte, z. B. [(SI)Ni(THF)]2NH. Die Umsetzung mit (dipy)Ni(COD) führt dagegen nur zu dem binuklearen Substitutionsprodukt [(dipy)Ni]2(SI—H)(THF).Bei langen Reaktionszeiten und erhöhter Temperatur erfolgt eine partielle Decarbonylierung von (dipy)Ni(PI)(THF)0,5. Im Gegensatz zu den Reaktionsprodukten von (dipy)Ni(COD) mit cyclischen Carbonsäureanhydriden entsteht dabei kein definierter Metallring, sondern unter Beteiligung des Lösungsmittels Benzamid.Maleinimid reagiert mit (dipy)Ni(COD) nicht als NH-acide Verbindung sondern als polares Olefin unter Substitution.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19855301124
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