title: Highly sensitive and selective colorimetric and off-on fluorescent reversible chemosensors for Al³⁺ based on the rhodamine fluorophore.
abstract: A series of rhodamine derivatives L1-L3 have been prepared and characterized by IR, 1H-NMR, 13C-NMR and ESI-MS. These compounds exhibited selective and sensitive "turn-on" 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-L3 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).
authors.affiliation: Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247 667, India. mergu.naveen@gmail.com.
authors.forename: Naveen
authors.initials: N
authors.lastname: Mergu
authors.affiliation: Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247 667, India. akscyfcy@gmail.com.
authors.forename: Ashok Kumar
authors.initials: AK
authors.lastname: Singh
authors.affiliation: Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247 667, India. vinodfcy@iitr.ac.in.|Center for Environment and Water, The research Institute, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia. vinodfcy@iitr.ac.in.|Department of Applied Chemistry, University of Johannesburg, Johannesburg 17011, South Africa. vinodfcy@iitr.ac.in.
authors.forename: Vinod Kumar
authors.initials: VK
authors.lastname: Gupta
mesh_terms: D003124:Colorimetry / Q000379:methods*; D009682:Magnetic Resonance Spectroscopy; D012235:Rhodamines / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D012235:Rhodamines