Electron vs energy transfer in arrays featuring two Bodipy chromophores axially bound to a Sn(IV) porphyrin via a phenolate or benzoate bridge
Lazarides T, Kuhri S, Charalambidis G, Panda MK, Guldi DM, Coutsolelos AG (2012)
Publication Type: Journal article, Original article
Publication year: 2012
Journal
Original Authors: Lazarides T., Kuhri S., Charalambidis G., Panda M.K., Guldi D.M., Coutsolelos A.G.
Publisher: American Chemical Society
Book Volume: 51
Pages Range: 4193-4204
Journal Issue: 7
DOI: 10.1021/ic2026472
Abstract
In this report we describe the synthesis of multichromophore arrays consisting of two Bodipy units axially bound to a Sn(IV) porphyrin center either via a phenolate (3) or via a carboxylate (6) functionality. Absorption spectra and electrochemical studies show that the Bodipy and porphyrin chromophores interact weakly in the ground state. However, steady-state emission and excitation spectra at room temperature reveal that fluorescence from both the Bodipy and the porphyrin of 3 are strongly quenched suggesting that, in the excited state, energy and/or electron transfer might occur. Indeed, as transient absorption experiments show, selective excitation of Bodipy in 3 results in a rapid decay (τ ≈ 2 ps) of the Bodipy-based singlet excited state and a concomitant rise of a charge-separated state evolving from the porphyrin-based singlet excited state. In contrast, room-temperature emission studies on 6 show strong quenching of the Bodipy-based fluorescence leading to sensitized emission from the porphyrin moiety due to a transduction of the singlet excited state energy from Bodipy to the porphyrin. Emission experiments at 77 K in frozen toluene reveal that the room-temperature electron transfer pathway observed in 3 is suppressed. Instead, Bodipy excitation in 3 and 6 results in population of the first singlet excited state of the porphyrin chromophore. Subsequently, intersystem crossing leads to the porphyrin-based triplet excited state. © 2012 American Chemical Society.
Authors with CRIS profile
Susanne Kuhri
Lehrstuhl für Physikalische Chemie I
Dirk Michael Guldi
Lehrstuhl für Physikalische Chemie I
Involved external institutions
Greece (GR)How to cite
APA:
Lazarides, T., Kuhri, S., Charalambidis, G., Panda, M.K., Guldi, D.M., & Coutsolelos, A.G. (2012). Electron vs energy transfer in arrays featuring two Bodipy chromophores axially bound to a Sn(IV) porphyrin via a phenolate or benzoate bridge. Inorganic Chemistry, 51(7), 4193-4204. https://doi.org/10.1021/ic2026472
MLA:
Lazarides, Theodore, et al. "Electron vs energy transfer in arrays featuring two Bodipy chromophores axially bound to a Sn(IV) porphyrin via a phenolate or benzoate bridge." Inorganic Chemistry 51.7 (2012): 4193-4204.
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