1997
DOI: 10.1016/s0040-4039(97)00916-7
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One-pot synthesis of a red-fluorescent chemosensor from an azacrown, phloroglucinol and squaric acid: A simple in-solution construction of a functional molecular device

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Cited by 45 publications
(6 citation statements)
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“…635 nm and ca. 665 nm, respectively (Scheme 4) [59]. The 1-Aza-18-crown-6 ionophore on SQS4 provided some preferential interactions with alkaline-earth metal ions over those of the alkaline ones, with Mg 2+ and Ba 2+ ions causing the largest decrease in the absorption and emission intensities of the sensor upon binding.…”
Section: Crown Ether-containing Squaraine Sensorsmentioning
confidence: 99%
See 1 more Smart Citation
“…635 nm and ca. 665 nm, respectively (Scheme 4) [59]. The 1-Aza-18-crown-6 ionophore on SQS4 provided some preferential interactions with alkaline-earth metal ions over those of the alkaline ones, with Mg 2+ and Ba 2+ ions causing the largest decrease in the absorption and emission intensities of the sensor upon binding.…”
Section: Crown Ether-containing Squaraine Sensorsmentioning
confidence: 99%
“…It is of interest to Scheme 4. One-pot synthesis of aza-crown-containing sensors SQS4 [59] and SQS5 [60].…”
Section: Crown Ether-containing Squaraine Sensorsmentioning
confidence: 99%
“…The observed fluorescence quenching is in line with a literature report of a crown-ether containing squaraine whose fluorescence was quenched in the presence of alkali and alkali earth metals. 17 In that report, the authors concluded that the metal ions caused fluorescence quenching through binding in the crown ether moieties, which disrupted the donor-acceptordonor nature of the squaraine chromophore. 18 Similarly, in this case we expect that the cesium cation binds strongly to diethanolamine, attenuating its strongly donating character and leading to highly efficient fluorescence quenching.…”
Section: Dalton Transactions Communicationmentioning
confidence: 99%
“…A large number of squaraines have been used as probes for the detection of a variety of analytes. 39 However, selectivity and sensitivity in most of the cases are not very promising. This limitation has led to further studies on the design of squaraine based molecular probes for better selectivity and sensitivity.…”
Section: Molecular Probes For Cations and Anionsmentioning
confidence: 99%