| | 1 | Author
| I. Timtcheva, P. Nikolov, St Minchevand, N. Sofroniev | Requires cookie* | | | Title
| Luminescence Properties of Some 4-or 5-Aminosubstituted Indan-13-Diones  | | | | Abstract
| The photophysical characteristics of some 4(5)-amino-2-aryl-and 4(5)-amino-2-aryl-2-carboxy-methyl-l,3-indandiones have been studied in solvents of different polarity at room temperature and at 77 °K. In contrast to the 2-arylindan-l,3-diones unsubstituted in the phthaloyl fragment, the compounds investigated are photostable and fluoresce in the region 25 000-18 000 cm -1 with fluorescence quantum yields between 0.1 and 0.5. | | | |
Reference
| Z. Naturforsch. 42a, 289—292 (1987); received October 22 1986 | | | |
Published
| 1987 | | | |
Keywords
| 4-and 5-amino indan-l, 3-diones, absorption, fluorescence, phosphorescence | | | |
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| default:Reihe_A/42/ZNA-1987-42a-0289.pdf | | | | Identifier
| ZNA-1987-42a-0289 | | | | Volume
| 42 | |
| 2 | Author
| J. Krzystek, H.J U C Von Schütz, Wolf, R.-D Stigler, J. J. Stezowski | Requires 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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| default:Reihe_A/42/ZNA-1987-42a-0622.pdf | | | | Identifier
| ZNA-1987-42a-0622 | | | | Volume
| 42 | |
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