Journal
TETRAHEDRON LETTERS
Volume 50, Issue 46, Pages 6383-6388Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2009.08.091
Keywords
Bodipys'; Dual dyes; Amino groups; Polyethyleneglycol; Fluorescence; Sensors
Categories
Funding
- CNRS
- French Embassy in India
- Bhabha Atomic Research Centre
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Several Bodipy dyes were synthesized with various substituents designed to potentially interact with adventurous cations including protons. Among the different synthetic strategies, protection of the amino group by a BOC appears efficient for the substitution of the fluoro groups on the boron by Grignard reagents. Single alkylation on the amino-Bodipy compounds by a polyethyleneglycol chain bearing an alkyne end group is feasible using a biphasic strategy. Linkage of a blue dye on the alkyne fragment is promoted by palladium(0) and it provides novel dual donor-acceptor dyes. Fluorescence of the mono-alkylated amino dyes is heavily quenched but restored by protonation or interaction with Fe(II) salts. Very efficient energy transfer from the donor (energy input at 20,000 cm(-1)) to the acceptor (energy output at 15,100 cm(-1)) is quantitative and not distance dependent. (C) 2009 Elsevier Ltd. All rights reserved.
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