Disabling photoinduced electron transfer in 4,4-difluoro-8(-4'-hydroxyphenyl)-1,3,5,7-tetramethyl-4-bora-3a,4a-diaza-s-indacene by phosphorylation.
The synthesis and photophysical characterization of the phosphorylated Bodipy dye 5 are reported and compared to those of its hydroxyphenyl counterpart 1. Conversion of the latter by three methods of phosphorylation yields the strongly fluorescent dye 5 which exhibits similar steady-state spectra like 1 but an approximately five times prolonged fluorescence lifetime tau(Fl). We attribute this distinct change from tau(Fl) = 0.7 ns for 1 to tau(Fl) = 3.7 ns for 5 to the suppression of photoinduced electron transfer in 5. This photochemical reaction was previously held responsible for fluorescence quenching in 1. Fluorescence correlation spectroscopy reveals that 5 can be detected by single-molecule methods and that uncaging of phosphate in 5 is a minor problem.
Jacob
Michaela
M
Biophysical Chemistry, Saarland University, Saarbruecken, Germany.
Schmitt
Alexander
A
Jung
Gregor
G
D001896:Boron Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D004583:Electrons; D005456:Fluorescent Dyes / Q000138:chemical synthesis / Q000737:chemistry*; D015394:Molecular Structure; D010766:Phosphorylation; D010777:Photochemistry; D013050:Spectrometry, Fluorescence; D013053:Spectrophotometry; D013055:Spectrophotometry, Infrared
C095489:4,4-difluoro-4-bora-3a,4a-diaza-s-indacene; D001896:Boron Compounds; D005456:Fluorescent Dyes