A new asymmetric fluorescent dye of the 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) class was prepared by fusing an anthracene unit to the "zig-zag" edge of the BODIPY core by an FeCl3-mediated oxidative cyclodehydrogenation reaction and the photophysical properties of the new BODIPY analogue were investigated. The anthracene-fused BODIPY exhibits significant bathochromic shifts in both absorption and fluorescence maxima compared with a related non-fused BODIPY. In addition, the anthracene-fused BODIPY exhibited a small energy gap (1.81 eV), large Stokes shift and high photo stability. Especially, the emission of the dye extended into the deep red (similar to 640 nm) region. The extensive pi conjugation is responsible for the red-shifted emission. Moreover, the dye emits strong saturated, red fluorescence with a quantum yield of 40% and an enlarged Stokes shift of 1425 cm(-1) (53 nm) in CHCl3, which can be used to image living cells by fluorescence microscopy. Cell imaging experiments demonstrated its potential application as a probe in bioorganisms due to its excellent imaging contrast. (C) 2015 Elsevier Ltd. All rights reserved.
In vitro cytotoxicity of a library of BODIPY-anthracene and -pyrene dyads for application in photodynamic therapy
作者:Susan Callaghan、Mikhail A. Filatov、Huguette Savoie、Ross W. Boyle、Mathias O. Senge
DOI:10.1039/c8pp00402a
日期:2019.2
The facile synthesis and in vitro activity of a library of heavy atom-free BODIPY-anthracene, -pyrene dyads (BAD-13-BPyrD-19) and a control (BODIPY 20) are reported. We demonstrate that singlet oxygen produced from dyad triplet states formed from charge-separated states is sufficient to induce cytotoxicity in human breast cancer cells (MDA-MB-468) at micromolar concentrations. The compounds in this series are promising candidates for photodynamic therapy, especially BAD-17 which displays significant photocytotoxicity (15% cell viability) at a concentration of 5 x 10(-7) M, with minimal toxicity (89% cell viability) in the absence of light.