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Title: Intramolecular Excimer Formation in a Tripodal Polyamine Receptor Containing Three Naphthalene Fluorophores
Authors: Albelda, M. Teresa 
García-España, Enrique 
Gil, Laura 
Lima, João C. 
Lodeiro, Carlos 
Melo, J. Seixas de 
Melo, M. João 
Parola, A. Jorge 
Issue Date: 10-Jul-2003
Publisher: American Chemical Society
Citation: The Journal of Physical Chemistry B. 107:27 (2003) 6573-6578
Abstract: A comprehensive investigation on the energetics and dynamics of a new fluorescent sensor constituted by a tripodal polyamine receptor containing three naphthalene fluorophores, compound L, is reported. The influence of external factors such as the solvent, hydrogen ion concentration, and temperature in the photophysics of the sensor is discussed. The temperature dependence of monomer/excimer interconversion of L revealed an average percentage relative sensitivity of 4.5%/°C thus portending its use as a temperature sensor. The activation energy for excimer formation (E1 = 12 kJ mol-1) and dissociation (E-1 = 57 kJ mol-1), entropy change (ΔS = −128 J K-1 mol-1), and the binding energy of the excimer (ΔH = 45 kJ mol-1) were obtained in water at acidic pH values and ethanol (E1 = 15 kJ mol-1, E-1 = 40 kJ mol-1, ΔS = −61 J K-1 mol-1, and ΔH = 25 kJ mol-1). The dependence of the kinetic and thermodynamic parameters on the dielectric constant of the medium and on the degree of protonation of the polyamine chain was interpreted in terms of the excimer destabilization provoked by the electrostatic repulsion between the positively charged chains.
ISSN: 1520-6106
DOI: 10.1021/jp0343032
Rights: openAccess
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais

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