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'fluorescence' in keywords Facet   Publication Year 2001  [X]
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1Author    Peter Nikolov, Irina Petkova, Stefan Stoyanov3Requires cookie*
 Title    Media Effect upon the Fluorescence Ability of Differently Substituted a-Cyanostilbenes  
 Abstract    The steady state and dynamic photophysical characteristics of a-cyanostilbene derivatives have been investigated in solution and in Polyvinylchloride (PVC) film at 300 K as well as in a frozen matrix at 77 K. While no emission is observed in solution, a significant fluorescence ability is registered both in PVC and frozen media. This fact is attributed to the matrix effect, which lessens the possible intramolecular motions around the central double bond. No phosphorescence at 77 K is observed. The fluorescence lifetimes at 77 K are compared with literature data for similar chemically fixed structures. 
  Reference    Z. Naturforsch. 56a, 447—451 (2001); received January 23 2001 
  Published    2001 
  Keywords    a-Cyanostilbene Derivatives, Fluorescence, Matrix Effect 
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 TEI-XML for    default:Reihe_A/56/ZNA-2001-56a-0447.pdf 
 Identifier    ZNA-2001-56a-0447 
 Volume    56 
2Author    G. C. Papavassiliou, G. A. Mousdis, I. B. KoutselasRequires cookie*
 Title    Some Organic-Inorganic Hybrid Compounds Based on «ö-Thiuronium Cations and Lead Halide Anions  
 Abstract    Using 1-chlorodecane (C10H21CI), benzyl chloride (C6H5CH2CI), a,a'-dichloro-p-xylene (CICH2C6H4CH2CI), 4-phenylbenzyl chloride (C6H5C6H4CH2CI), 2-bromomethyl-naphthal-ene (CioHyC^Br), 4-bromomethyl-7-methoxycoumarin (CioHzO^C^Br), 2-bromomethyl-anthraquinone (CuH TC ^C ^Br), 9-chloromethyl-anthracene (C14H9CH2CI), thiourea and halides as starting materials, the organic-inorganic hybrid compounds [CioH2iSC(NH2)2]2Pbl4, [C6H5CH2SC(NH2)2]4Pb3l,o, [(H sN h C S C ^ C ö H tC ^ S Q N H jh k sP b ls, [C6H5C6H4CH2S-C(NH2)2]PbI3, [C,oH7CH2SC(NH2)2]Pbl3, [CioH yChC^SQNHzhlPbL, [C^HyOjCHzSC-(NH2)2]PbI3, [C,4H9CH2SC(NH2)2]Pbl3, and [C M H gO ^SQ N H z^hPbB ^ were prepared and characterized analytically and spectroscopically. 
  Reference    (Z. Naturforsch. 56b, 57—61 [2001]; received September 11 2000) 
  Published    2001 
  Keywords    Organic-Inorganic Hybrids, Low-Dimensional Semiconductors, Fluorescence 
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 TEI-XML for    default:Reihe_B/56/ZNB-2001-56b-0057.pdf 
 Identifier    ZNB-2001-56b-0057 
 Volume    56 
3Author    I. Grabchev, I. Moneva, E. Wolarz3, D. Bauman3, S. StoyanovbRequires cookie*
 Title    Spectral Properties of 3-Benzanthrone Derivative Dyes in Isotropic Solvents, Polymer Film and Liquid Crystal  
 Abstract    Some recently synthesized benzanthrone derivatives bearing azomethine and oxy groups at C-3 po­ sition have been systematically studied. The influence of the substituents and of the environment (iso­ tropic and anisotropic media) on the absorption and fluorescence of the dyes and their vibronic transi­ tions is discussed in this paper. 
  Reference    Z. Naturforsch. 56a, 291—296 (2001); received January 24 2001 
  Published    2001 
  Keywords    3-Benzanthrone Derivatives, Azomethine and Oxy substitutes, Absorption, Fluorescence, Vibronic Structure 
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 TEI-XML for    default:Reihe_A/56/ZNA-2001-56a-0291.pdf 
 Identifier    ZNA-2001-56a-0291 
 Volume    56