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
    Physical, chemical and biological studies on transition metal complexes of chelating tridentate ligand (1988)
    Springer
    Transition metal chemistry 13 (1988), S. 332-335 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The interaction of 1-benzoin-4-phenylthiosemicarbazone (H2 BPS) with some transition metal ions has been investigated. The ligand can function as a tridentate chelating agent, giving M(HBPS)2 and M(BPS). Potentiometric studies proved that the mechanism of chelation is based on hydrogen ion liberation. Spectral studies in solution show that the ligand could be used for the microdetermination of CuIIions. On the basis of magnetic and spectral data, an octahedral structure is proposed for the CoII and NiII complexes and a square-planar structure for the CuII complex. The corrosion inhibition of aluminium in Cl3CCO2H using H2BPS is studied. The electrical conductivity of H2BPS and of its complexes have been measured. The ligand shows an activation energy in the range of semiconducting materials. The antimicrobial activity of all compounds has also been demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01225121
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Electrical conductivity, spectral and magnetic properties of some transition metal complexes derived from dimedone bis(4-phenylthiosemicarbazone) (1988)
    Springer
    Transition metal chemistry 13 (1988), S. 143-145 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary CoII, NiII, CuII, ZnII, CdII and UVIO2 complexes of 5, 5-dimethyl-1, 3-cyclohexanone bis(4-phenylthiosemicarbazone), H2CPT, have been characterized by elemental analysis, i.r. and reflectance spectral studies, and magnetic moment measurements. I.r. spectra show that H2CPT gives rise to dibasic quadridentate SNNS donor. A square-planar structure is proposed for the copper(II) complex and octahedral for cobalt(II) and nickel(II) complexes according to the magnetic and electronic spectral data. The electrical conductivities of H2CPT and its COII, NiII, CuII and CdII complexes were measured. The positive temperature coefficient (dδ/dT) and the higher activation energies of H2CPT and its CdII and CuII complexes is evidence of their semiconducting character.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01087807
    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 and properties of 7-formyl-8-hydroxyquinoline and its transition metal complexes (1990)
    Springer
    Transition metal chemistry 15 (1990), S. 222-225 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary CoII, NiII, CuII, CdII and HgII complexes of 7-formyl-8-hydroxyquinoline (HFHQ) have been prepared, and characterized by elemental analysis, molar conductivities, electronic and i.r. spectra, and magnetic measurements. It was found that the ligand acts as a neutral monodentate or a monobasic bidentate donor. The CoII, NiII and CuII complexes possess, respectively, tetrahedral, octahedral and square-planar structures based on their magnetic and electronic spectral data. The electrical conductivities of HFHQ and its metal complexes were measured at different temperatures and their activation energies were calculated. The values obtained for the CoII, NiII, CdII and HgII complexes agree fairly well with those reported for semiconductors. The ligand was tested as a corrosion inhibitor for aluminium; the limiting concentration of HFHQ to give maximum efficiency (99.2%) is 10−3 mole dm−3 at 22°C. The metal-ligand ratios and apparent formation constants for the species generated in ethanol solution were determined spectrophotometrically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01038379
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    The effect of γ-irradiation on optical and electrical properties of polycarbonate (1987)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 150 (1987), S. 81-87 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wurde Poly(bisphenol-A-carbonat) (PC) unterschiedlichen Dosen von Gammastrahlung einer 60Co-Quelle (0,05-0,3 Mrad) bei Raumtemperatur ausgesetzt, und anschließend wurden Leitfähigkeits-, Dielektrizitäts- und optische Messungen ausgeführt. Erwähnt wird, daß in noch keiner Arbeit über das elektrische Leitvermögen von PC bei hohen Temperaturen berichtet worden ist. Man vermutet, daß die Gammabestrahlung von PC freie Radikale erzeugt, die den Unordnungszustand erhöhen und die Orientierung der Dipole im Polymeren stören. Bei ca. 95°C erhöhen sich die elektrischen Leitfähigkeiten der bestrahlten Proben nahezu um eine Größenordnung im Vergleich zu den unbestrahlten. Die Dielektrizitätskonstante ∊ des unbehandelten PC ist über einen Bereich von ca. 70°C nahezu temperaturunabhängig, bevor sie mit der Temperatur zunimmt. Bei bestrahlten Proben (0,05-0,3 Mrad) dagegen wächst ∊ kontinuierlich mit der Temperatur. Dies bestätigt, daß die Gammastrahlung eine Störung der Orientierung der Dipole im Polymeren bewirkt. Im UV-Spektrum wurde eine breite Bande bei 0,280 μm gefunden, und die Absorptionsintensität war sehr stark von der Gammastrahlungsdosis abhägig.
    Notes: Poly-(bisphenol A carbonate) (PC) samples were exposed to different doses of γ-rays from a 60Co source (from 0.05 to 0.3 M rad) at room temperature. Conductivity and dielectric constant as well as optical measurements were carried out. It was noticed that almost no work has been reported on the electrical conductivity of polycarbonate at high temperatures. γ-irradiation of polycarbonate is believed to create free radicals which increases the state of disorder and perturb the orientation of dipoles inside the polymer. At about 95°C, the electrical conductivities of irradiated samples were found to increase by nearly one order of magnitude with respect to the unirradiated one. The dielectric constant, ∊, of fresh polycarbonate was nearly temperature independent over a range of ∼ 70°C, then it increased with temperature, but for γ-irradiated samples (from 0.05 to 0.3 M rad) the dielectric constant increased continuously with temperature and also with respect to the fresh sample what confirms the effect of γ-irradiation in perturbing the orientation of the dipoles in the polymer. It was found that the UV absorption spectrum has a broad band at 0.280 μm and the absorption intensity was strongly dependent on the dose of γ-irradiation.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1987.051500107
    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...