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Digitale Medien

Fluorescence of poly(di-n-alkylsilane)s in room-temperature solution (1991)

Sun, Ya-Ping ; Miller, Robert D. ; Sooriyakumaran, R. ; [weitere]

Springer

Journal of inorganic and organometallic polymers and materials 1 (1991), S. 3-35

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ISSN: 1572-8870

Schlagwort(e): Fluorescence ; polysilane ; σ conjugation ; conformation ; segment distribution

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Abstract A comprehensive study of the electronic absorption and emission spectra and the fluorescence quantum yield and lifetime of seven poly(di-n-alkylsilane)s and of three isotopically labelled poly(di-n-hexylsilane)s in hydrocarbon solution at room temperature is reported. Also reported are fluorescence polarization and carbon tetrachloride quenching of fluorescence of poly(di-n-hexylsilane). The observed fluorescence spectra, quantum yield, and polarization depend on the selected excitation energy in a very characteristic fashion, whereas the fluorescence lifetime does not; however, it depends on the selected emission energy. These characteristic dependencies are qualitatively accounted for by the previously proposed segment distribution model if one assumes that the photophysical behavior at higher excitation energies is strongly affected by the presence of a low-lying weakly allowed state in short-segment chromophores and the behavior at lower excitation energies is dictated by the selective excitation of emitting long-segment chromophores.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00701027

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Digitale Medien

Polysilanes - a new look at some old materials (1989)

Miller, Robert D.

Weinheim : Wiley-Blackwell

Advanced Materials 1 (1989), S. 433-440

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ISSN: 0935-9648

Schlagwort(e): Radiation Sensitivity ; Ceramic Precursors ; Photoinitiators ; Microlithography ; Nonlinear Optics ; Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Maschinenbau , Physik

Notizen: In spite of the fact that the first polysilane derivatives were probably prepared in the mid 1920's, there was little scientific interest until recently. The synthesis of the first soluble homo and copolymers about 10 years ago has stimulated an explosive development of this class of materials. This brief review traces the historical development of the polysilanes and focuses on recent studies of polymer structure, electronic properties, photochemical reactions and mechanisms and finally on new applications.

Zusätzliches Material: 4 Ill.