Please use this identifier to cite or link to this item:
https://hdl.handle.net/10316/10401
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Albelda, M. Teresa | - |
dc.contributor.author | García-España, Enrique | - |
dc.contributor.author | Gil, Laura | - |
dc.contributor.author | Lima, João C. | - |
dc.contributor.author | Lodeiro, Carlos | - |
dc.contributor.author | Melo, J. Seixas de | - |
dc.contributor.author | Melo, M. João | - |
dc.contributor.author | Parola, A. Jorge | - |
dc.contributor.author | Pi | - |
dc.date.accessioned | 2009-06-29T08:29:37Z | - |
dc.date.available | 2009-06-29T08:29:37Z | - |
dc.date.issued | 2003-07-10 | - |
dc.identifier.citation | The Journal of Physical Chemistry B. 107:27 (2003) 6573-6578 | en_US |
dc.identifier.issn | 1520-6106 | - |
dc.identifier.uri | https://hdl.handle.net/10316/10401 | - |
dc.description.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. | en_US |
dc.language.iso | eng | en_US |
dc.publisher | American Chemical Society | en_US |
dc.rights | openAccess | eng |
dc.title | Intramolecular Excimer Formation in a Tripodal Polyamine Receptor Containing Three Naphthalene Fluorophores | en_US |
dc.type | article | en_US |
dc.identifier.doi | 10.1021/jp0343032 | - |
uc.controloAutoridade | Sim | - |
item.grantfulltext | open | - |
item.cerifentitytype | Publications | - |
item.languageiso639-1 | en | - |
item.openairetype | article | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | Com Texto completo | - |
crisitem.author.researchunit | CQC - Coimbra Chemistry Centre | - |
crisitem.author.parentresearchunit | Faculty of Sciences and Technology | - |
crisitem.author.orcid | 0000-0001-9708-5079 | - |
Appears in Collections: | FCTUC Química - Artigos em Revistas Internacionais |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Intramolecular Excimer Formation in a Tripodal Polyamine.pdf | 161.55 kB | Adobe PDF | View/Open |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.