title: Nickel(II)-induced excimer formation of a naphthalene-based fluorescent probe for living cell imaging.
abstract: Ni(2+)-induced intramolecular excimer formation of a naphthalene-based novel fluorescent probe, 1-[(naphthalen-3-yl)methylthio]-2-[(naphthalen-6-yl)methylthio]ethane (L), has been investigated for the first time and nicely demonstrated by excitation spectra, a fluorescence lifetime experiment, and (1)H NMR titration. The addition of Ni(2+) to a solution of L (DMSO:water = 1:1, v/v; λ(em) = 345 nm, λ(ex) = 280 nm) quenched its monomer emission, with subsequent enhancement of the excimer intensity (at 430 nm) with an isoemissive point at 381 nm. The fluorescence lifetime of free L (0.3912 ns) is much lower than that of the nickel(2+) complex (1.1329 ns). L could detect Ni(2+) as low as 1 × 10(-6) M with a fairly strong binding constant, 2.0 × 10(4) M(-1). Ni(2+)-contaminated living cells of plant origin could be imaged using a fluorescence microscope.
authors.affiliation: Department of Chemistry, The University of Burdwan, Burdwan 713104, West Bengal, India.
authors.forename: Arnab
authors.initials: A
authors.lastname: Banerjee
authors.forename: Animesh
authors.initials: A
authors.lastname: Sahana
authors.forename: Subarna
authors.initials: S
authors.lastname: Guha
authors.forename: Sisir
authors.initials: S
authors.lastname: Lohar
authors.forename: Ipsit
authors.initials: I
authors.lastname: Hauli
authors.forename: Subhra Kanti
authors.initials: SK
authors.lastname: Mukhopadhyay
authors.forename: Jesús
authors.initials: J
authors.lastname: Sanmartín Matalobos
authors.forename: Debasis
authors.initials: D
authors.lastname: Das
mesh_terms: D002413:Cations, Divalent / Q000032:analysis / Q000737:chemistry; D005456:Fluorescent Dyes / Q000138:chemical synthesis / Q000737:chemistry*; D019684:Magnoliopsida / Q000166:cytology*; D008856:Microscopy, Fluorescence / Q000379:methods; D008958:Models, Molecular; D009281:Naphthalenes / Q000138:chemical synthesis / Q000737:chemistry*; D009532:Nickel / Q000032:analysis* / Q000737:chemistry; D011058:Pollen / Q000166:cytology
chemical_list: D002413:Cations, Divalent; D005456:Fluorescent Dyes; D009281:Naphthalenes; C031721:naphthalene; D009532:Nickel