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Cover Picture: Solid‐State Gas Sensors Developed from Functional Difluoroboradiazaindacene Dyes (Chem. Eur. J. 6/2009)
Author(s) -
Ziessel Raymond,
Ulrich Gilles,
Harriman Anthony,
Alamiry Mohammed A. H.,
Stewart Beverly,
Retailleau Pascal
Publication year - 2009
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200990008
Subject(s) - chemistry , fluorescence , anthracene , thymine , reagent , combinatorial chemistry , photochemistry , dna , organic chemistry , optics , biochemistry , physics
Highly porous polyacrylate beads coated with a dialkylaminostyryl boradiazaindacene dye are green, but emit light outside the range visible to the human eye. Exposure to trace amounts of acid (symbolized on the picture by a gas flow spiced with traces of HCl<100 ppb) turns the beads deep blue and switches on an intense red fluorescence. The process, which is fully reversed in the presence of base, also responds to alkylating reagents and phosgene. In their Full paper on page 1359 ff. , R. Ziessel et al. report compelling evidence for this unique push–pull–pull mechanism