Library

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
  • 1
    Electronic Resource
    Electronic Resource
    Zinc-67 NMR study of zinc ions in water and in some nonaqueous and mixed solvents (1982)
    Springer
    Journal of solution chemistry 11 (1982), S. 17-26 
    Details
    ISSN: 1572-8927
    Keywords: Zinc-67 NMR ; nonaqueous solution ; zinc complexes ; crown ethers ; EDTA ; methanol ; dimethylformamide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Solutions of zinc salts in water, methanol (MeOH), dimethylformamide (DMF) and binary mixtures of water with the two nonaqueous solvents were studied by zinc-67 NMR measurements. Anhydrous zinc nitrate solutions in DMF and MeOH show upfield, concentration independent, chemical shifts at −27 and −19 ppm, respectively, vs. the aqueous solution standard. Addition of DMF or MeOH to an aqueous solution of a zinc salt results in a diamagnetic shift but for the addition of acetonitrile a paramagnetic shift results. In all cases the signal was broadened very considerably, e.g., in ZnCl2 solution the linewidth increased from ∼40 to ∼600 Hz in going from water to 35% aqueous MeOH. Both67Zn and13C NMR failed to show any complexation of Zn2+ ion by crown ethers in aqueous solution. A gradual addition of EDTA, of diaza-18-crown-6 or of tetraazacyclotetradecane resulted in an immediate broadening of the67Zn signal which became undetectable when one equivalent of a ligand was added.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00664331
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    N-substituted methacrylamide copolymers. Novel membranous material for carbon kidneyDedicated to Prof. Dr. T. Tsuruta on the occasion of his 65th birthday (1985)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 186 (1985), S. 2461-2471 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Copolymers of N-substituted methacrylamide (1a, b), new biomaterials, were synthesized to be used as encapsulating membranes of carbon kidney. In order to obtain a copolymer with a suitable hydrophilic property, the aminolysis of styrene-methyl methacrylate (St-MMA) copolymer with N-(2-hydroxyethyl)ethylenediamine was carried out under various conditions. The occurrence of aminolysis was confirmed by elemental analysis, IR and 1H NMR spectra. It was shown that a copolymer of N-substituted methacrylamide with a predictable degree of hydrophilicity can be obtained by controlling the composition ratio of the St-MMA copolymer and the degree of aminolysis of the copolymer. Hemoperfusion experiments with a living animal (dog), using a minicolumn with several types of microspheric activated carbon encapsulated with various copolymers, showed that copolymers with suitable hydrophilicity and hydrophobicity or with proper structure have a good blood compatibility. Studies with creatinine, uric acid and vitamin B12 showed that microspheric activated carbon, encapsulated with N-substituted methacrylamide copolymers of proper hydrophilicity and structure, has a good penetration property, and that detaching of activated carbon particles is effectively prevented.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1985.021861206
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Synthesis of poly(2-hydroxyethyl methacrylate)-poly(tetramethylene glycol) ABA type block copolymers and their blood compatibilityDedicated to Prof. T. Tsuruta (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 367-374 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: 2-Hydroxyethyl methacrylate was polymerized in presence of 2-mercaptoethylamine to an amino-semitelechelic poly(2-hydroxyethyl methacrylate). Poly(tetramethylene glycol) was reacted with 4,4′-methylenediphenyl diisocyanate to form a diisocyanato-telechelic poly(tetramethylene glycol). Both prepolymers were linked together by coupling reaction between —NH2 and —NCO groups in DMF at 0°C, resulting in an ABA type block copolymer. The structure of the product was examined by IR, NMR and SEM. It was found that the block copolymer possesses a microphase separated structure. Animal experiments showed that this ABA type block copolymer has good blood compatibility and excellent permeability for uric poisonous substances.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1986.021870216
    Library Location Call Number Volume/Issue/Year 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...