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Single\u2010crystal structural determinations confirm the planarity of the dyes, while the absorption and fluorescence spectroscopic properties are highly sensitive to the state of protonation (or alkylation) of the terminal anilino donor group(s). Reversible color tuning from green to blue for absorption and from colorless (i.e., near\u2010IR region) to red for fluorescence is obtained on successive addition of acid and base. The difunctionalized derivative is especially interesting in this respect and shows two well\u2010resolved p<jats:italic>K<\/jats:italic><jats:sub>a<\/jats:sub> values of 5.10 and 3.04 in acetonitrile. Addition of the first proton causes only small spectral changes and deactivates the molecule towards addition of the second proton. It is this latter step that accommodates the large change in absorption and emission properties, due to the reversible extinction of the intramolecular charge\u2010transfer character inherent to this type of dye. The main focus of the work is the covalent anchoring of the dyes to inert, porous polyacrylate beads so as to form a solid\u2010state sensor suitable for analysis of gases or flowing liquids. The final material is highly stable\u2014its performance is undiminished after more than one year\u2014and fully reversible over many cycles. The sensitivity is such that reactions can be followed by the naked eye and the detection limit is about 600\u2005ppb for HCl and about 80\u2005ppb for ammonia. Trace amounts of diphosgene can be detected, as can alkylating agents. The sensing action is indiscriminate and also operates when the beads are dispersed in aqueous media.<\/jats:p>","DOI":"10.1002\/chem.200801911","type":"journal-article","created":{"date-parts":[[2008,12,31]],"date-time":"2008-12-31T13:11:30Z","timestamp":1230729090000},"page":"1359-1369","source":"Crossref","is-referenced-by-count":122,"title":["Solid\u2010State Gas Sensors Developed from Functional Difluoroboradiazaindacene Dyes"],"prefix":"10.1002","volume":"15","author":[{"given":"Raymond","family":"Ziessel","sequence":"first","affiliation":[]},{"given":"Gilles","family":"Ulrich","sequence":"additional","affiliation":[]},{"given":"Anthony","family":"Harriman","sequence":"additional","affiliation":[]},{"given":"Mohammed\u2005A.\u2005H.","family":"Alamiry","sequence":"additional","affiliation":[]},{"given":"Beverly","family":"Stewart","sequence":"additional","affiliation":[]},{"given":"Pascal","family":"Retailleau","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2009,1,20]]},"reference":[{"key":"e_1_2_6_1_2","unstructured":"\u00a0"},{"key":"e_1_2_6_2_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr960386p"},{"key":"e_1_2_6_3_2","volume-title":"Chemosensors of Ion and Molecular Recognition","year":"1997"},{"key":"e_1_2_6_4_2","volume-title":"Chemical Sensors and Biosensors for Medical and Biological Applications","year":"1998"},{"key":"e_1_2_6_5_2","doi-asserted-by":"publisher","DOI":"10.1002\/1521-3757(20010202)113:3<502::AID-ANGE502>3.0.CO;2-A"},{"key":"e_1_2_6_5_3","doi-asserted-by":"publisher","DOI":"10.1002\/1521-3773(20010202)40:3<486::AID-ANIE486>3.0.CO;2-P"},{"key":"e_1_2_6_6_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr010450p"},{"key":"e_1_2_6_7_2","volume-title":"Molecular Fluorescence: Principles and Applications","year":"2002"},{"key":"e_1_2_6_8_2","unstructured":"See for example:"},{"key":"e_1_2_6_9_2","unstructured":"Coord. 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