Journal of Organic Chemistry, volume 77, issue 10, pages 4516-4527
Heavy Atom Free Singlet Oxygen Generation: Doubly Substituted Configurations Dominate S1 States of Bis-BODIPYs
Publication type: Journal Article
Publication date: 2012-05-02
Journal:
Journal of Organic Chemistry
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor: 3.6
ISSN: 00223263, 15206904
Organic Chemistry
Abstract
S(0), S(1), and T(1) states of various orthogonal 8,8' and 8,2'-bis-boradiaza-s-indacene (BODIPY) dyes, recently (Angew. Chem., Int. Ed.2011, 50, 11937) proposed as heavy atom free photosensitizers for O(2)((1)Δ(g)) generation, were studied by multireference quantum chemical approaches. S(0)→S(1) excitation characteristics of certain bis-BODIPYs are shown to be drastically different than the parent BODIPY chromophore. Whereas a simple HOMO→LUMO-type single substitution perfectly accounts for the BODIPY core, S(1) states of certain orthogonal bis-BODIPYs are described as linear combinations of doubly substituted (DS) configurations which overall yield four electrons in four singly occupied orbitals. Computed DS character of S(1), strongly correlated with facile (1)O(2) production, was presumed to occur via S(1)→T(1) intersystem crossing (ISC) of the sensitizer. Further confirmation of this relation was provided by newly synthesized BODIPY derivatives and comparison of spectroscopic properties of their dimers and monomers. Near-IR absorption, desired for potential photodynamic therapy applications, was not pursuable for bis-chromophores by the standard strategy of π-extension, as DS singlet states are destabilized. Decreased exchange coupling in π-extended cases appears to be responsible for this destabilization. Comparisons with iodine incorporated bis-BODIPYs suggest that the dynamics of (1)O(2) generation via DS S(1) states are qualitatively different from that via ISC originating from heavy atom spin-orbit coupling. Although red-shifting the absorption wavelength to enter the therapeutic window does not seem attainable for orthogonal bis-BODIPYs with DS S(1) states, modifications in the chromophore cores are shown to be promising in fine-tuning the excitation characteristics.
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- We do not take into account publications that without a DOI.
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Duman S. et al. Heavy Atom Free Singlet Oxygen Generation: Doubly Substituted Configurations Dominate S1 States of Bis-BODIPYs // Journal of Organic Chemistry. 2012. Vol. 77. No. 10. pp. 4516-4527.
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Duman S., Cakmak Y., Kolemen S., Akkaya E. U., Dede Y. Heavy Atom Free Singlet Oxygen Generation: Doubly Substituted Configurations Dominate S1 States of Bis-BODIPYs // Journal of Organic Chemistry. 2012. Vol. 77. No. 10. pp. 4516-4527.
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TY - JOUR
DO - 10.1021/jo300051v
UR - https://doi.org/10.1021%2Fjo300051v
TI - Heavy Atom Free Singlet Oxygen Generation: Doubly Substituted Configurations Dominate S1 States of Bis-BODIPYs
T2 - Journal of Organic Chemistry
AU - Duman, Selin
AU - Cakmak, Yusuf
AU - Kolemen, Safacan
AU - Akkaya, Engin U.
AU - Dede, Yavuz
PY - 2012
DA - 2012/05/02 00:00:00
PB - American Chemical Society (ACS)
SP - 4516-4527
IS - 10
VL - 77
SN - 0022-3263
SN - 1520-6904
ER -
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@article{2012_Duman,
author = {Selin Duman and Yusuf Cakmak and Safacan Kolemen and Engin U. Akkaya and Yavuz Dede},
title = {Heavy Atom Free Singlet Oxygen Generation: Doubly Substituted Configurations Dominate S1 States of Bis-BODIPYs},
journal = {Journal of Organic Chemistry},
year = {2012},
volume = {77},
publisher = {American Chemical Society (ACS)},
month = {may},
url = {https://doi.org/10.1021%2Fjo300051v},
number = {10},
pages = {4516--4527},
doi = {10.1021/jo300051v}
}
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MLA
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Duman, Selin, et al. “Heavy Atom Free Singlet Oxygen Generation: Doubly Substituted Configurations Dominate S1 States of Bis-BODIPYs.” Journal of Organic Chemistry, vol. 77, no. 10, May. 2012, pp. 4516-4527. https://doi.org/10.1021%2Fjo300051v.