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

Batat, Pinar, Cantuel, Martine, Jonusauskas, Gediminas, Scarpantonio, Luca, Palma, Aniello, O’Shea, Donal F., 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: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) (KAR id:64615)

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.
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
DOI/Identification number: 10.1021/jp2077775
Subjects: Q Science
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
Depositing User: Aniello Palma
Date Deposited: 22 Nov 2017 11:30 UTC
Last Modified: 16 Nov 2021 10:24 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/64615 (The current URI for this page, for reference purposes)

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