title: Solvent viscosity tuned highly selective NIR and ratiometric fluorescent sensing of Fe3+ by a symmetric chalcone analogue.
abstract: The present communication outlined for the first time a novel combination of chromogenic near-infrared (NIR) and ratiometric fluorescence responses for Fe(3+) by a symmetric chalcone analogue (receptor 1). The key step behind NIR chromogenic response was attributed to chelation of Fe(3+) with receptor 1 upon its unfolding in aprotic, low viscosity solvents. The receptor 1 also exhibited Fe(3+) selective ratiometric changes at 538 nm and 463 nm. The chromogenic detection limit of the receptor 1 for Fe(3+) is the lowest ever (5.8 × 10(-8) M). The mechanistic details of NIR/fluorescence sensing of receptor 1 along with its solvent dependency have been discussed in detail.
authors.affiliation: Department of Chemistry (Centre of Advanced Study), Faculty of Science, Banaras Hindu University, Varanasi-221005, India. drkaushalbhu@yahoo.co.in.
authors.forename: Uzra
authors.initials: U
authors.lastname: Diwan
authors.forename: Ajit
authors.initials: A
authors.lastname: Kumar
authors.forename: Virendra
authors.initials: V
authors.lastname: Kumar
authors.forename: K K
authors.initials: KK
authors.lastname: Upadhyay
mesh_terms: D002599:Chalcone / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry; D018360:Crystallography, X-Ray; D007501:Iron / Q000032:analysis*; D057230:Limit of Detection; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D008958:Models, Molecular; D056004:Molecular Dynamics Simulation; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013055:Spectrophotometry, Infrared; D019265:Spectroscopy, Near-Infrared / Q000379:methods*
chemical_list: D002599:Chalcone; D007501:Iron