BATAT, Pinar; CANTUEL, Martine; JONUSAUSKAS, Gediminas; SCARPANTONIO, Luca; PALMA, Aniello; O'SHEA, Donal F.; MCCLENAGHAN, Nathan

doi:10.1021/jp2077775

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BATAT, Pinar
Institut des Sciences Moléculaires [ISM]
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

CANTUEL, Martine
Institut des Sciences Moléculaires [ISM]

JONUSAUSKAS, Gediminas
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

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Journal of Physical Chemistry A. 2011-10-21, vol. 115, n° 48, p. 14034-14039

American Chemical Society

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BF2-Azadipyrromethene dyes are a promising class of NIR emitter (nonhalogenated) and photosensitizer (halogenated). Spectroscopic studies on a benchmark example of each type, including absorption (one and two photon), time-resolved transient absorption (ps-ms) and fluorescence, are reported. Fast photodynamics reveal that intense nanosecond NIR fluorescence is quenched in a brominated analog, giving rise to a persistent (21 μs) transient absorption signature. Kinetics for these changes are determined and ascribed to the efficient population of a triplet state (72%), which can efficiently sensitize singlet oxygen formation (ca. 74%), directly observed by 1Δg luminescence. Photostability measurements reveal extremely high stability, notably for the nonhalogenated variant, which is at least 103-times more stable (Φphotodeg. = < 10-8) than some representative BODIPY and fluorescein dyes.< Réduire

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BF2-azadipyrromethenes: probing the excited-state dynamics of a NIR fluorophore and photodynamic therapy agent

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