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Energetics and Dynamics of Naphthalene Polyaminic Derivatives. Influence of Str...

Melo, J. Seixas de; Pina, J.; Pina, F.; Lodeiro, C.; Parola, A. J.; Lima, J. C.; Teresa Albelda, M.; Paz Clares, M.; Garcia-España, Enrique

Two new fluorescent macrocyclic structures bearing two naphthalene (Np) units at both ends of a cyclic polyaminic chain were investigated with potentiometric, fluorescence (steady-state and time-resolved) and laser flash photolysis techniques. The fluorescence emission studies show the presence of an excimer species whose formation depends on the protonation state of the polyamine chains implying the existence ...


Long Range Electron Transfer Quenching in Polyamine Chains Bearing a Terminal N...

Pina, Fernando; Lima, J. C.; Lodeiro, Carlos; Melo, J. Seixas de; Díaz, Pilar; Teresa Albelda, M.; García-España, Enrique

The fluorescence emission of a naphthalene unit attached to a polyamine chain is quenched by intramolecular electron transfer from the deprotonated amines to the excited fluorophore. Measurements of the respective quenching rate constants as a function of the distance, reveal an exponential dependence with β = 0.45 Å-1. Identical measurements carried out in deuterated water have shown a similar dependence with ...


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Fundação para a Ciência e a Tecnologia Universidade do Minho   Governo Português Ministério da Educação e Ciência Programa Operacional da Sociedade do Conhecimento União Europeia