{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,9]],"date-time":"2026-03-09T00:11:39Z","timestamp":1773015099286,"version":"3.50.1"},"reference-count":40,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2015,4,17]],"date-time":"2015-04-17T00:00:00Z","timestamp":1429228800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>A series of rhodamine derivatives L1\u2013L3 have been prepared and characterized by IR, 1H-NMR, 13C-NMR and ESI-MS. These compounds exhibited selective and sensitive \u201cturn-on\u201d fluorescent and colorimetric responses to Al3+ in methanol. Upon the addition of Al(III), the spiro ring was opened and a metal-probe complex was formed in a 1:1 stoichiometry, as was further confirmed by ESI-MS spectroscopy. The chemo-dosimeters L1\u2013L3 exhibited good binding constants and low detection limits towards Al(III). We also successfully demonstrate the reversibility of the metal to ligand complexation (opened ring to spirolactam ring).<\/jats:p>","DOI":"10.3390\/s150409097","type":"journal-article","created":{"date-parts":[[2015,4,17]],"date-time":"2015-04-17T11:09:30Z","timestamp":1429268970000},"page":"9097-9111","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":74,"title":["Highly Sensitive and Selective Colorimetric and Off-On  Fluorescent Reversible Chemosensors for Al3+ Based on the Rhodamine Fluorophore"],"prefix":"10.3390","volume":"15","author":[{"given":"Naveen","family":"Mergu","sequence":"first","affiliation":[{"name":"Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247 667, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ashok","family":"Singh","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247 667, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2809-2966","authenticated-orcid":false,"given":"Vinod","family":"Gupta","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247 667, India"},{"name":"Center for Environment and Water, The research Institute, King Fahd University of  Petroleum & Minerals, Dhahran 31261, Saudi Arabia"},{"name":"Department of Applied Chemistry, University of Johannesburg, Johannesburg 17011, South Africa"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2015,4,17]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"S18","DOI":"10.1016\/S0264-410X(02)00166-4","article-title":"Aluminum salts in vaccines-US perspective","volume":"20","author":"Baylor","year":"2002","journal-title":"Vaccine"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"66","DOI":"10.1006\/rtph.2000.1441","article-title":"Safety evaluation of dietary aluminum","volume":"33","author":"Soni","year":"2001","journal-title":"Regul. 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