Journal
RSC ADVANCES
Volume 6, Issue 62, Pages S7417-S7423Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra11009f
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- CSIR (Govt. of India)
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For ratiometric, fluorogenic and naked eye detection of the environmentally and biologically important ions Hg2+ and OCl- in one platform, a 2-(2'-hydroxyphenyl)-benzothiazole (HBT) inserted thiolactam containing a new rhodol system, spirothiolactamized benzothiazole substituted N,N-diethylrhodol (STBR), is designed and synthesized. We can detect Hg2+ and OCl- in solutions by a simple, easy-to-synthesize practical ratiometric chemodosimeter with two different modes of reactions with a low detection limit. The observed color in the presence of Hg2+ or OCl- may arise from the reaction of Hg2+ or OCl- with STBR - the thiolactam moiety is broken and it helps to achieve maximum pi-pi* conjugation which results in a brilliant red fluorescence. From H-1-NMR and ESI-MS data, it is clear that the modes of the reaction for Hg2+ and OCl- are different. Test strips are also prepared to observe color changes. The sensing phenomena are fruitfully applied for live-cell imaging in Saccharomyces cerevisiae cells (from a short to long time range, 0 min to 120 min). The single crystal X-ray structure of the synthesised ESIPT rhodol moiety is also reported.
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