TY - JOUR
T1 - Tautomerism and dual fluorescence in 9-substituted n-propyl- and methoxyethyl-porphycenes
AU - Planas, Oriol
AU - Tejedor-Estrada, Roger
AU - Nonell, Santi
N1 - Funding Information:
We are indented to Professor Silvia E. Braslavsky, from the Max-Planck-Institut für Bioanorganische Chemie (formerly Strahlenchemie) for the gift of the porphycene samples studied in this work. This project was supported by a grant from the Spanish Ministry of Science and Innovation (MICINN, ref. CTQ2010-20870-C03-01). R.T. thanks the Comissionat per a Universitats i Recerca del Departament d’Innovació, Universitats i Empresa de la Generalitat de Catalunya and the European Social Fund for a FI research grant.
PY - 2012
Y1 - 2012
N2 - Dual fluorescence is described and characterized for several 9-substituted porphycenes. Using both spectroscopic and computational studies, the phenomenon is related to the differential stabilization of the two trans tautomers in the excited state. The electronic nature of the 9-substituents affects both the energy and the lifetime of the two tautomers as well as their interconversion. The results are consistent with a two-step model for excited-state tautomerization that involves the population of an upper excited state, tentatively assigned to a cis species, which in turn provides an efficient non-radiative pathway to the ground state.
AB - Dual fluorescence is described and characterized for several 9-substituted porphycenes. Using both spectroscopic and computational studies, the phenomenon is related to the differential stabilization of the two trans tautomers in the excited state. The electronic nature of the 9-substituents affects both the energy and the lifetime of the two tautomers as well as their interconversion. The results are consistent with a two-step model for excited-state tautomerization that involves the population of an upper excited state, tentatively assigned to a cis species, which in turn provides an efficient non-radiative pathway to the ground state.
KW - dual fluorescence
KW - porphycene
KW - tautomerization
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U2 - 10.1142/S1088424612500526
DO - 10.1142/S1088424612500526
M3 - Article
AN - SCOPUS:84862904240
SN - 1088-4246
VL - 16
SP - 633
EP - 640
JO - Journal of Porphyrins and Phthalocyanines
JF - Journal of Porphyrins and Phthalocyanines
IS - 5-6
ER -