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Although some colorimetric probes have been reported to detect hydrogen sulfide (H<jats:sub>2<\/jats:sub>S), the creation of rapid, highly selective and sensitive probes for the detection of H<jats:sub>2<\/jats:sub>S remains a challenging target. In this work, we established dinitrosulphonamide decorated phenanthridine and 2,4\u2010dinitro\u2010N\u2010(4\u2010(7,8,13,14\u2010tetrahydrodibenzo[a, i]phenanthridin\u20105\u2010yl)phenyl)benzenesulfonamide (<jats:bold>PHSH<\/jats:bold>), for the calorimetric detection of H<jats:sub>2<\/jats:sub>S. H<jats:sub>2<\/jats:sub>S\u2010triggered thiolysis of <jats:bold>PHSH<\/jats:bold> resulted in a marked absorption enhancement alongside a visual color change from colorless to dark yellow. The result indicated that the chemosensor showed high sensitivity and selectivity with a fast response of less than 10\u2009s with a detection limit as low as 6.5\u2009nM. The chemosensor reaction mechanism with H<jats:sub>2<\/jats:sub>S was studied by UV\u2010vis, <jats:sup>1<\/jats:sup>H NMR, mass and HPLC analysis. In addition, the chemosensor has been used for the determination of H<jats:sub>2<\/jats:sub>S in many real\u2010time samples.<\/jats:p>","DOI":"10.1111\/php.13506","type":"journal-article","created":{"date-parts":[[2021,8,13]],"date-time":"2021-08-13T08:21:53Z","timestamp":1628842913000},"page":"141-149","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["A Highly Selective and Sensitive Colorimetric Chemosensor for the Detection of Hydrogen Sulfide: A Real\u2010time Application in Multiple platforms"],"prefix":"10.1111","volume":"98","author":[{"given":"Dhanapal","family":"Jothi","sequence":"first","affiliation":[{"name":"Department of Chemistry School of Advanced Sciences Vellore Institute of Technology Vellore India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sathishkumar","family":"Munusamy","sequence":"additional","affiliation":[{"name":"Institute of Chemical Biology and Nanomedicine State 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