title: New duel fluorescent "on-off" and colorimetric sensor for Copper(II): Copper(II) binds through N coordination and pi cation interaction to sensor.
abstract: Schiff base derived from naphthylamine and benzil (L) binds to two Cu(2+) ions, one by coordination through N of the Schiff base and another by pi cation interaction through benzil rings. This bonding pattern determined by DFT calculation has been proved by matching electronic spectrum obtained from TDDFT calculation to the experimental one. L acts as "on-off" fluorescent and bare eye detectable colorimetric (purple color) sensor for Cu(2+) ion over the metal ions - Na(+), K(+), Ca(2+) Mn(2+), Co(2+) Ni(2+), Zn(2+), Pb(2+), Cd(2+), Hg(2+), Ag(+), Hg(2+) and Al(3+) in 1:1 v/v CH3CN:H2O. These metal ions do not interfere the fluorescent/colorimetric sensing. As fluorescent sensor the linear range of detection is 5×10(-5) to 3×10(-4)M and detection limit 10(-5)M.
authors.affiliation: Department of Chemistry, Gauhati University, Guwahati 781 014, India.
authors.forename: Jutika
authors.initials: J
authors.lastname: Kumar
authors.affiliation: Department of Chemistry, Arya Vidyapeeth College, Guwahati 781 016, India.
authors.forename: Pradip K
authors.initials: PK
authors.lastname: Bhattacharyya
authors.affiliation: Department of Chemistry, Gauhati University, Guwahati 781 014, India. Electronic address: digantakdas@gmail.com.
authors.forename: Diganta Kumar
authors.initials: DK
authors.lastname: Das
mesh_terms: D015057:1-Naphthylamine / Q000737:chemistry; D002413:Cations, Divalent / Q000032:analysis; D003124:Colorimetry / Q000379:methods; D003300:Copper / Q000032:analysis*; D005456:Fluorescent Dyes / Q000737:chemistry*; D057230:Limit of Detection; D008958:Models, Molecular; D010658:Phenylglyoxal / Q000031:analogs & derivatives / Q000737:chemistry; D012545:Schiff Bases / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods
chemical_list: D002413:Cations, Divalent; D005456:Fluorescent Dyes; D012545:Schiff Bases; D003300:Copper; D015057:1-Naphthylamine; D010658:Phenylglyoxal; C006697:benzil
keywords: Colorimetric; Copper(II); DFT; Fluorescence; Sensor; pi-Cation