TY - JOUR
T1 - Chemosensors displaying pH controlled multistage fluorescence emission
AU - Pina, Fernando
AU - Melo, M. João
AU - Bernardo, M. Alexandra
AU - Luis, Santiago V.
AU - García-España, Enrique
PY - 1999/9
Y1 - 1999/9
N2 - A large number of systems displaying pH controlled multistages of fluorescence emission intensity, have not been recognized from this point of view. In this work we present two paradigmatic cases: (i) polyamine receptors linked to a fluorophore unit, in which the signal is modulated by an intra-molecular pH dependent electron transfer process, (ii) phenols presenting adiabatic excited state proton transfer. In the first example the chemosensors are constituted by a receptor unit containing a polyaza moiety suitable for binding protons (but also metal ions or anions). The receptor is linked to a benzene or naphthalene unit that acts as a fluorophore. The fluorescence signal is dependent on the protonation state of the receptor. In the second example, addition of buffers are used to tune the intensity of the fluorescence emission.
AB - A large number of systems displaying pH controlled multistages of fluorescence emission intensity, have not been recognized from this point of view. In this work we present two paradigmatic cases: (i) polyamine receptors linked to a fluorophore unit, in which the signal is modulated by an intra-molecular pH dependent electron transfer process, (ii) phenols presenting adiabatic excited state proton transfer. In the first example the chemosensors are constituted by a receptor unit containing a polyaza moiety suitable for binding protons (but also metal ions or anions). The receptor is linked to a benzene or naphthalene unit that acts as a fluorophore. The fluorescence signal is dependent on the protonation state of the receptor. In the second example, addition of buffers are used to tune the intensity of the fluorescence emission.
UR - http://www.scopus.com/inward/record.url?scp=0002530816&partnerID=8YFLogxK
U2 - 10.1016/S1010-6030(99)00102-1
DO - 10.1016/S1010-6030(99)00102-1
M3 - Article
AN - SCOPUS:0002530816
SN - 1010-6030
VL - 126
SP - 65
EP - 69
JO - Journal of Photochemistry and Photobiology A: Chemistry
JF - Journal of Photochemistry and Photobiology A: Chemistry
IS - 1-3
ER -