title: A novel pyrazole biscoumarin based chemosensors for the selective detection of Cu(2+) and Zn(2+) ions.
abstract: A novel chemosensor based on pyrazole biscoumarin molecule "4-hydroxy-3-((4-hydroxy-2-oxo-2H-chromen-3-yl)(1,3-diphenyl-1H-pyrazol-4-yl)methyl)-2H-chromen-2-one" (PBC) was synthesized by a simple method. The chemosensing properties of PBC towards transition metal ions like Cu(2+) and Zn(2+) by naked eye, UV-Visible and fluorescence spectroscopic methods were described. The PBC solution with Cu(2+) and Zn(2+) ion showed brown and blue colour respectively. The UV-Visible spectra of PBC with Cu(2+) and Zn(2+) ions exposed their corresponding absorption maxima. Further, the Job's plot method confirmed the 1:1 and 2:1 stoichiometry of the complex formation between the PBC with Cu(2+) and Zn(2+) ions respectively. The fluorescence enhancement of PBC on binding with Cu(2+) and Zn(2+) is due to the inhibition of photo induced electron transfer mechanism.
authors.affiliation: Department of Chemistry, University College of Engineering Tindivanam (a Constituent College of Anna University Chennai), Melpakkam 604001, India.
authors.forename: Karthikeyan
authors.initials: K
authors.lastname: Kandasamy
authors.affiliation: Department of Chemistry, University College of Engineering Tindivanam (a Constituent College of Anna University Chennai), Melpakkam 604001, India. Electronic address: sibi.gb@gmail.com.
authors.forename: Sivaprasad
authors.initials: S
authors.lastname: Ganesabaskaran
authors.affiliation: Department of Chemistry, University College of Engineering Tindivanam (a Constituent College of Anna University Chennai), Melpakkam 604001, India; Department of Chemistry, Anna University, Chennai 600025, India.
authors.forename: Muthusamy Poomalai
authors.initials: MP
authors.lastname: Pachamuthu
authors.affiliation: Center for Environmentally Beneficial Catalysis (CEBC), The University of Kansas, Lawrence, KS 66047, USA. Electronic address: anand@ku.edu.
authors.forename: Anand
authors.initials: A
authors.lastname: Ramanathan
mesh_terms: D002412:Cations / Q000032:analysis; D003300:Copper / Q000032:analysis*; D003374:Coumarins / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry; D011720:Pyrazoles / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D015032:Zinc / Q000032:analysis*
chemical_list: D002412:Cations; D003374:Coumarins; D005456:Fluorescent Dyes; D011720:Pyrazoles; C031280:pyrazole; D003300:Copper; D015032:Zinc
keywords: Copper ion; Coumarin; Fluorescence sensor; Naked-eye detection; Pyrazole; Zinc ion