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
  • Chemistry  (3)
  • distance distribution  (1)
  • side-chain liquid crystalline polymer  (1)
Collection
Keywords
Publisher
Years
  • 1
    Electronic Resource
    Electronic Resource
    Concentration quenching of photoluminescence of polysiloxane-pendant Ru(bpy) 3 2+ film and intermolecular distance distribution of the complex (1994)
    Springer
    Journal of inorganic and organometallic polymers and materials 4 (1994), S. 391-401 
    Details
    ISSN: 1572-8870
    Keywords: Polysiloxane ; ruthenium complex ; photoluminescence ; concentration quenching ; distance distribution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Photoluminescent Ru(bpy) 3 2+ complex was covalently anchored on a polysiloxane chain, and photoluminescence of the film was studied. The emission yield becomes lower with higher probe concentration indicating concentration quenching. The intermolecular distance distribution of the probe was obtained by statistical analysis, and the distance for static concentration quenching was 0.83 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00683703
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Photoluminescence of polysiloxane containing mesogenic 4-cyanobiphenyl in solution (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 34 (1996), S. 2059-2065 
    Details
    ISSN: 0887-6266
    Keywords: side-chain liquid crystalline polymer ; polysiloxane ; fluorescence ; excimer ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Photoluminescent characteristics of polysiloxane containing pendant mesogenic 4-cyanobiphenyl (CB) and its monomeric analogues were studied in THF solution. An excimer formation was observed, and the increase in CB content in polysiloxane induced the increase in the fluorescence intensity from the excimers. The fluorescence decays were analyzed by triexponential function. A high CB content induced small decay rates, indicating the decrease of nonradiational decay. Such suppression of the nonradiation decay in higher CB content was explained by a strong mesogenic interaction between CB groups in solution. © 1996 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
  • 3
    Electronic Resource
    Electronic Resource
    Concentration quenching of photoluminescent Ru(bpy)2+3 dispersed in a polysiloxane film containing 2,2′-bipyridine pendant groups in dependence of molecular distribution (1995)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 196 (1995), S. 1241-1250 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The photoluminescent Ru(bpy)2+3 complex was dispersed in a polysiloxane film containing 2,2′-bipyridine (bpy) pendant groups. The unusually long photoluminescence lifetime of the Ru(bpy)2+3 (1,94 μs at 25°C) and the blue-shifted photoluminescent wavelength suggest a rigid polymer matrix. The fluorescence yield becomes lower with higher probe concentration, indicating concentration quenching. According to the analysis based on Stern-Volmer plots, the quenching obeys a mechanism composed of both static and dynamic processes. A statistical intermolecular distance distribution between the probes was used to interpret the results in terms of static and dynamic quenching. It is shown that in the present system the dispersed complexes diffuse slightly during the excited state.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1995.021960423
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Photoluminescence of a new water-insoluble polysiloxane film containing pendant Ru(bpy)32+ and its quenching by dioxygen (1996)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 197 (1996), S. 2983-2999 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A new water-insoluble polysiloxane containing pendant Ru(bpy)32+ (bpy = 2,2′-bipyridine) was studied with respect to the photoluminescence and its quenching by dioxygen. The emission was quenched by O2 in water more efficiently than in gas phase, and the Stern-Volmer plots showed a downward deviating curve. To determine which of several quenching models can be applied to the present system, the emission decays under various O2 concentration were measured, and analyzed by a double exponential decay. From the simulations of the decay using the kinetic parameters obtained from the model analysis, it has been concluded that the quenching by O2 is caused by static quenching (model 4). The O2 concentration in the film in contact with water estimated from the quenching parameters was much higher than the solubility of O2 estimated from the solubility coefficient in a dry film. These results suggest specific affinity of the polysiloxane for O2 molecule in water.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1996.021970930
    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...