BF2-Azadipyrromethenes: Probing the Excited-State Dynamics of a NIR Fluorophore and Photodynamic Therapy Agent

Batat, Pinar and Cantuel, Martine and Jonusauskas, Gediminas and Scarpantonio, Luca and Palma, Aniello and O’Shea, Donal F. and McClenaghan, Nathan D. (2011) BF2-Azadipyrromethenes: Probing the Excited-State Dynamics of a NIR Fluorophore and Photodynamic Therapy Agent. The Journal of Physical Chemistry A, 115 (48). pp. 14034-14039. ISSN 1089-5639. (doi:https://doi.org/10.1021/jp2077775) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
https://doi.org/10.1021/jp2077775

Abstract

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 ?s) 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 1?g luminescence. Photostability measurements reveal extremely high stability, notably for the nonhalogenated variant, which is at least 103-times more stable (?photodeg. = < 10–8) than some representative BODIPY and fluorescein dyes.

Item Type: Article
Subjects: Q Science
Divisions: Faculties > Sciences > School of Physical Sciences
Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Aniello Palma
Date Deposited: 22 Nov 2017 11:30 UTC
Last Modified: 23 Nov 2017 10:52 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/64615 (The current URI for this page, for reference purposes)
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