6533b7ddfe1ef96bd1275173
RESEARCH PRODUCT
Switching from intramolecular energy transfer to intramolecular electron transfer by the action of pH and Zn2+ co-ordination
Pilar DíazJoão C. LimaFernando PinaM. Teresa AlbeldaConxa SorianoCarlos LodeiroA. Jorge ParolaEnrique García-españaJ. Sérgio Seixas De Melosubject
Anthracenechemistry.chemical_compoundElectron transferQuenching (fluorescence)chemistryIntramolecular forceExcited stateGeneral Physics and AstronomyProtonationPhysical and Theoretical ChemistryPhotochemistryLone pairAcceptordescription
Abstract Intramolecular electron (eT) and energy transfer (ET) have shown to occur in a covalently linked donor–acceptor (CLDA) system consisting of a naphthalene donor covalently linked through a polyamine chain connector to an anthracene acceptor; the connector has been chosen in order to switch ON or OFF the energy flux as a function of its protonation state as well as by co-ordination to Zn 2+ . The largest energy transfer efficiency ( η =0.61) occurs for the fully protonated form (pH 9 (eT) from the lone pairs of the nitrogens to the excited fluorophore takes place, leading to complete quenching of the emission. On the other hand at neutral and basic pH values, co-ordination of Zn 2+ prevents the eT quenching allowing the ET process to occur.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2002-02-01 | Chemical Physics Letters |