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Linear FreeEnthaipy Relation for Radical Yield in Fluorescence Quenching by Electron Transfer
| Content Provider | Semantic Scholar |
|---|---|
| Author | Stelner, U. E. Vogeknann, E. Kramer, A. |
| Copyright Year | 2001 |
| Abstract | pendicular to the bimane u orbitals, and the fluorescence should not be quenched. The low quantum yield in mono(trimethy1ammonio)syn-bimane (c#I~ = 0.06) and monoprotonated monopiperidino-syn-bimane (& = 0.045) may be due to an intramolecular quenching process promoted by an unsymmetrical charge distribution in the excited state. Unsymmetrical substitution in the syn-bimane system, especially when one ring is "donor" substituted and the other Yacceptorn substituted, lowers the quantum yield of fluorescence. A large ApK, difference (ca. 7) has been found by Kemp and co-workersB for what we think best described as syn-(H0,H)B or syn-(hydroxy,hydrogen)bimane (5). The similarity of the pK, for the excited state of the monopiperidino derivative, syn-(C5HloNH+CHz,CH3)(CH3,CH3)B, based on fluorescence data, to the pK, for the ground state, based on absorption data, indicated that there are no substantial differences between the protonation equilibria for the ground and excited states, at least as far as the donor substituents are concerned. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://kops.uni-konstanz.de/bitstream/handle/123456789/9748/Linear_free_enthalpy_relation_for_radical_yield_in_fluorescence_quenching_by_electron_transfer.pdf?isAllowed=y&sequence=1 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
