Abstract
Paramagnetic derivatives of tolan, anthracene, and terphenyl of the A - Sp - R ̇ type, where A is an aromatic group, R ̇ is a stable radical center, and Sp is a spacer, were synthesized. The electronic absorption and luminescence spectra of these compounds were examined. The introduction of the paramagnetic dihydroimidazole fragment causes a decrease (10 - 500-fold) in the quantum yield of luminescence compared to emission of the individual aromatic luminophore. The presence of a radical center (R ̇ ) in the (alkane) ̇+ / -̇ A - Sp - R ̇ radical-ionic pair leads to the disappearance or fast (nanoseconds) damping of the magnetic effect of luminescence arising upon recombination of these pairs.
Original language | English |
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Pages (from-to) | 1409-1414 |
Number of pages | 6 |
Journal | Russian Chemical Bulletin |
Volume | 49 |
Issue number | 8 |
DOIs | |
Publication status | Published - 1 Jan 2000 |
Externally published | Yes |
Keywords
- Alkynes
- Anthracene
- Luminescence
- Magnetic effects
- Nitroxyl radicals
- Radical ions
- Terphenyl
- Tolan
ASJC Scopus subject areas
- Chemistry(all)