Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/10401
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dc.contributor.authorAlbelda, M. Teresa-
dc.contributor.authorGarcía-España, Enrique-
dc.contributor.authorGil, Laura-
dc.contributor.authorLima, João C.-
dc.contributor.authorLodeiro, Carlos-
dc.contributor.authorMelo, J. Seixas de-
dc.contributor.authorMelo, M. João-
dc.contributor.authorParola, A. Jorge-
dc.contributor.authorPina, Fernando-
dc.contributor.authorSoriano, Conxa-
dc.date.accessioned2009-06-29T08:29:37Z-
dc.date.available2009-06-29T08:29:37Z-
dc.date.issued2003-07-10-
dc.identifier.citationThe Journal of Physical Chemistry B. 107:27 (2003) 6573-6578en_US
dc.identifier.issn1520-6106-
dc.identifier.urihttp://hdl.handle.net/10316/10401-
dc.description.abstractA 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.en_US
dc.language.isoengen_US
dc.publisherAmerican Chemical Societyen_US
dc.rightsopenAccesseng
dc.titleIntramolecular Excimer Formation in a Tripodal Polyamine Receptor Containing Three Naphthalene Fluorophoresen_US
dc.typearticleen_US
dc.identifier.doi10.1021/jp0343032-
item.languageiso639-1en-
item.fulltextCom Texto completo-
item.grantfulltextopen-
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais
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