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1987 (1)
1Author    J. Krzystek, H.J U C Von Schütz, Wolf, R.-D Stigler, J. J. StezowskiRequires cookie*
 Title    Characterization of the Phenanthrene-Tetrachlorophthalic Anhydride (P/TCPA) 1:1 Charge-Transfer Crystal: Spectroscopic and Structural Investigations  
 Abstract    The 1:1 phenanthrene-tetrachlorophthalic anhydride (P/TCPA) charge-transfer complex crystalizes with monoclinic symmetry, space group P2,, with two magnetically inequivalent stacks in the unit cell. The noncentrosymmetric space group is very unusual for CT-complexes. The optical emission spectra at low temperature are characterized by a strong CT phospho-rescence and a weak CT fluorescence and delayed fluorescence. The S, band lies at 22 800 ± 100 cm" 1 , the T, band at 21 200 ± 100 cm" 1 . Above 15 K triplet excitons, moving along the stacks are revealed by ESR. They have a CT character of about 30%, coinciding with that of the shallow X-traps found by ODMR at jow temperatures. A further trap, with zero-field-splitting (zfs) parameters of £> = ±0.0617, E = + 0.0116 cm" 1 has a much larger CT character of 50% as found in the isolated complex in low-temperature glass [1]. A structural model is proposed. 
  Reference    Z. Naturforsch. 42a, 622—630 (1987); received February 28 1987 
  Published    1987 
  Keywords    Charge-transfer crystal, crystal structure, fluorescence, phosphorescence, triplet excitons 
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 TEI-XML for    default:Reihe_A/42/ZNA-1987-42a-0622.pdf 
 Identifier    ZNA-1987-42a-0622 
 Volume    42