title: Spectrophotometric and spectrofluorimetric studies on the selective sensing of fluoride ions by Co(II) and Ni(II) complexes of naphthoquinone derivative possessing enhanced H-bonding property.
abstract: A novel colorimetric chemosensor based on aminonaphthoquinone (L) bearing an N-H receptor unit directly attached to quinone signaling unit has been designed, synthesized and demonstrated. The ligand showed a highly selective colorimetric response to fluoride ions based on H-bond formation with the receptor unit. The binding constants of the L and its square planar [Co(L)Cl(2)]·3H(2)O and [Ni(L)Cl(2)]·4H(2)O complexes, computed using fluorescent enhancement data, were found to be 0.6, 1.5 and 0.9×10(8)M(-1), respectively, indicating enhancement of H-bond donor ability of the receptor unit, as a result of complexation with metal ions, towards fluoride ion sensing. Also, these sensors had high selectivity for fluoride ion detection over other common anions, such as Cl(-), Br(-), I(-), AcO(-), NO(3)(-), H(2)PO(4)(-) and CN(-) in acetonitrile.
authors: Department of Chemistry, Gandhigram Rural Institute (Deemed University), Gandhigram 624302, India.
authors: Selvaraj
authors: S
authors: Madhupriya
authors: Kuppanagounder P
authors: KP
authors: Elango
mesh_terms: D000042:Absorption; D000097:Acetonitriles / Q000737:chemistry; D003035:Cobalt / Q000737:chemistry*; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry; D005459:Fluorides / Q000032:analysis*; D005470:Fluorometry / Q000379:methods*; D006860:Hydrogen Bonding; D007477:Ions; D008024:Ligands; D009285:Naphthoquinones / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet
chemical_list: D000097:Acetonitriles; D056831:Coordination Complexes; D007477:Ions; D008024:Ligands; D009285:Naphthoquinones; D003035:Cobalt; D009532:Nickel; D005459:Fluorides; C032159:acetonitrile