ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Inorganic Chemistry  (4)
  • Polymer and Materials Science  (1)
  • bis(2-pyridinamine) adducts of MII bis(acetylacetonate)
  • Bis(1, 3-diketonato)cobalt-bisimidazoles
  • Wiley-Blackwell  (5)
  • 1980-1984  (5)
  • 1983  (2)
  • 1981  (3)
Collection
Keywords
  • Inorganic Chemistry  (4)
  • Polymer and Materials Science  (1)
  • bis(2-pyridinamine) adducts of MII bis(acetylacetonate)
  • Bis(1, 3-diketonato)cobalt-bisimidazoles
  • Chemistry  (8)
    • +
Publisher
  • Wiley-Blackwell  (5)
Years
  • 1980-1984  (5)
Year
  • 1
    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
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    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
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Polyaminoalkohole als bifunktionelle Extraktionsmittel für Kupfer(II) (1983)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 504 (1983), S. 105-112 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Polyamino Alcohols as Bifunctional Extractants for Copper(II)Polyamino alcohols obtained by the addition of mono- or bifunctional epoxides to disecondary diamines are studied with regard to their applicability to copper(II) extraction. The simple diamino diols IV, V, and VI proved to be inefficient. But, depending on the anion, distribution ratios D up to 1000 were measured with the polyamino alcohol III (chloroform as a diluent) in weakly acidic solution. This is a result of the special structure of the copper(II) complex of III which is both a metal chelate and a substituted ammonium salt. The ammonium part, because of its high affinity to the chloroform phase, has the function of a phase-transfer reagent of the chelate part.
    Notes: Polyaminoalkohole, die durch Addition von mono- oder bifunktionellen Epoxiden an disekundäre Diamine entstehen, werden auf ihre Verwendbarkeit als Extraktionsmittel für Kupfer(II) geprüft. Während sich die einfachen Diaminodiole IV bis VI als ungeeignet erweisen, werden mit dem Polyaminoalkohol III (Verdünnungsmittel Chloroform) abhängig vom Anion in schwach saurer Lösung maximale Verteilungsverhältnisse D von 1000 gefunden. Dieser Effekt geht auf den besonderen Charakter der Kupfer(II)-Komplexe von III zurück, die die Funktion eines Metallchelates und eines substituierten Ammoniumsalzes in sich vereinigen. Der Ammoniumteil mit seiner hohen Affinität für die Chloroformphase wirkt als Phasentransfer-Reagenz für den Chelatteil.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19835040913
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    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
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    1-Bis(carboxymethyl)amino-butandion-2,3-dioxim als ambifunktioneller Ligand in Komplexen der 3d-Elemente (1981)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 479 (1981), S. 147-157 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1-Bis(carboxymethyl)amino-butanedione-2,3-dioxime as an Ambifunctional Ligand in Complexes of 3d ElementsIn acid solution 1-bis(carboxymethyl)amino-butanedione-2,3-dioxime H4A affords octahedral 1,1 complexes MII(H2A)(H2O)x (MII = Cu, Ni, Co) coordinating as a tetradentate ligand by the imino diacetic acid group and the oxime group in 2-position. At 4.5 〈 pH 〈 8 Ni(H2A)(H2O)x and Cu(H2A)(H2O)x are deprotonated, in addition to Ni(HA)- the binuclear chelate [Ni2(HA)2]2- is formed. In solution containing a surplus of ligand H4A also the planar chelate [Ni(HA)2]4- with the donor set N4 can be detected. The transition from [Ni(HA)]- to [Ni(HA)2]4- is connected with a change of the coordination sphere (imino diacetic acid group → dioxime group) and the cis-trans isomerization of at least one oxime group.Protonation and stability constants are given and the properties of solid complexes are described.
    Notes: 1-Bis(carboxymethyl)amino-butandion-2,3-dioxim H4A bildet in saurer Lösung oktaedrische 1,1-Komplexe MII(H2A)(H2O)x (MII = Cu, Mi, Co), in denen es vierzählig über die Iminodiessigsäure- und die Oximgruppe in 2-Stellung koordiniert. Ni(H2A)(H2O)x und Cu(H2A) (H2O) unterliegen im neutralen Gebiet der Deprotonierung; im Falle des Nickel(II) entsteht neben Ni(HA)- auch das binucleare Chelat [Ni2(HA)2]2-. In Lösungen mit einem Ligandenüberschuß kann der planare Komplex [Ni(HA)2]4- mit dem Donatorsatz N4 nachgewiesen werden. Beim übergang von [Ni(HA)]- in [Ni(HA)2]4- wechselt das Nickel(II) die Koordinationssphäre; gleichzeitig erfolgt die Cis-trans-Isomerisierung mindestens einer Oximgruppe.Protonierungs- und Komplexstabilitätskonstanten sowie die Eigenschaften kristalliner Komplexe werden mitgeteilt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19814790818
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...