title: Naked-eye recognition of Cu(II), Zn(II) and acetate ion by the first guanine-based difunctional chromoinophore.
abstract: The first guanine-based difunctional colorimetric receptor 8-[(4-nitrophenyl)azo]guanine (receptor 1) was designed, synthesized and characterized by IR, UV-vis, (1)H NMR and mass spectrometric analysis. The synthesized receptor 1 was able to recognize Cu(II), Zn(II) and acetate ion through visible color changes in its DMSO and DMSO-H(2)O (95:5, v/v) solution. The binding affinity of the receptor 1 with the chosen analytes has been estimated in terms of binding constants through non-linear fittings of corresponding UV-vis titration data while the binding mode of the same was studied through (1)H NMR spectral studies.
authors.affiliation: Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi 221005, India. drkaushalbhu@yahoo.co.in
authors.forename: K K
authors.initials: KK
authors.lastname: Upadhyay
authors.forename: Ajit
authors.initials: A
authors.lastname: Kumar
authors.forename: Jianzhang
authors.initials: J
authors.lastname: Zhao
authors.forename: Rakesh K
authors.initials: RK
authors.lastname: Mishra
mesh_terms: D000085:Acetates / Q000737:chemistry*; D001391:Azo Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D003124:Colorimetry / Q000379:methods*; D003300:Copper / Q000737:chemistry*; D006147:Guanine / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D008968:Molecular Conformation; D013056:Spectrophotometry, Ultraviolet; D015032:Zinc / Q000737:chemistry*
chemical_list: C549493:8-((4-nitrophenyl)azo)guanine; D000085:Acetates; D001391:Azo Compounds; D006147:Guanine; D003300:Copper; D015032:Zinc