The liquid crystal orientation technique has been utiiized to determine the j#arizatfon of the emission from complexes formed in the excited state. The experimentaL results agree wtth theoretfcal predicttons made for hetero-excimers with appreciable admixture of locally excited states.
The polarization of excimer fluorescence from a dinucleotide
β Scribed by Patrik R. Callis
- Publisher
- Elsevier Science
- Year
- 1973
- Tongue
- English
- Weight
- 483 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
The polarization of the excimer fluorescence from the dinucleotide CpC has been observed to be strikingIy different from that of the monomer. The mixed polarization in the absorption reflects significant ground state interaction. The mixed polarization in the fluorescence is most likely due to a component which is polarized between the chromophores, a manifestation of charge resonance character in the excimer state.
π SIMILAR VOLUMES
The monomer and excimer fluorescence polarization of 4,9-disubstituted pyrenes with molecular long axes nearly perpendicular to the pyrene skeleton were measured in a nematic liquid crystal. By comparison with unsubstituted pyrene it is found that the excimer transition moment is oriented parallel t
Using the excimer modei, an expression is derived to explain solvent and con~~untion dependence of the "anom-&Us" longwavelength fluorescence intensity of N,N-di;rlkyl-p-cYano~niLines in polar media. Olher ITIOdCIS are discussed.
The spcclficlty of fluorometry IS u\cful m the qualitative analysis of a compound without prior szpsration. EIowevcr. in some CBSCS. the fluorcsccncc emission due to two compctmg Processes may take place at clo~ly xparatcd wavcIengths. It 15 suggested that in such d ca5c. the polarlzdtlon spectrum m