Multivalued Logic with a Tristable Fluorescent Switch
Ferreira, R; Remon, P; Pischel, Uwe
| HERO ID | 3575463 |
|---|---|
| In Press | No |
| Year | 2009 |
| Title | Multivalued Logic with a Tristable Fluorescent Switch |
| Authors | Ferreira, R; Remon, P; Pischel, Uwe |
| Journal | Journal of Physical Chemistry C |
| Volume | 113 |
| Issue | 14 |
| Page Numbers | 5805-5811 |
| Abstract | A fluorophorel-spacer-receptor-spacer-fluorophore, dyad was prepared and photophysically characterized. The two spectrally well-differentiated fluorophores are 1,8-naphthalimide and its 4-amino-substituted derivative, the latter showing strong ICT emission. The receptor unit consists of a tertiary amine, which leads to site-selective PET (only the 1,8-naphthalimide part gets quenched). This process can be blocked by protonation of the tertiary amine, which, on the other hand, results in enhanced singlet-singlet energy transfer between the 1,8-naphthalimide and 4-amino-1,8-naphthalimide parts (Phi(EET) = 0.27 and 0.59 for neutral and monoprotonated form, respectively). In acetonitrile, the monoprotonated form can be deprotonated by sufficiently basic anions like fluoride in micromolar concentration (<20 mu M). The observed fluorescence\ quenching, due to PET-reactivation, is ca. 41%. Further addition of fluoride in concentrations > 1 mM leads to deprotonation of the 4-amino group of one of the naphthalimides, which is accompanied by more fluorescence quenching (ca. 93%). The resulting double-sigmoidal titration curve enables the implementation of ternary logic. Using fluoride anions as degenerate inputs results in a ternary NOR logic gate, which is demonstrated for the first time. |
| Doi | 10.1021/jp809527d |
| Wosid | WOS:000264805700065 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |