title: Ratiometric/'turn-on' fluorescent chemosensor for CN-: mimicking XNOR logic function with Fe3+ ions.
abstract: The naphthyl-appended chemosensors 5-7 based on thiacalix[4]arene of cone and 1,3-alternate conformations have been synthesized which show high selectivity toward CN(-) ions by using hydrogen bonding and displacement approach. The presence of CN(-) induces quenching of fluorescence emission of compound 5 and ratiometric fluorescence behaviour of compounds 6 and 7 through hydrogen bonding interactions. Further, chemosensors 5-7 show high affinity for Fe(3+) ions with quenching of fluorescence emission, among all the metal ions tested. The 'in situ' prepared iron complexes of compounds 5-7 shows high "turn-on" selectivity toward CN(-) ions over the other anions. The molecular switching has been observed between chemical inputs of Fe(3+) and CN(-) ions which mimics the operation of an exclusive-NOR (XNOR) logic gate.
authors: Department of Chemistry, UGC Sponsored-Centre for Advance Studies-1 Guru Nanak Dev University, Amritsar, Punjab, India.
authors: Rajesh
authors: R
authors: Kumar
authors: Vandana
authors: V
authors: Bhalla
authors: Manoj
authors: M
authors: Kumar
mesh_terms: D002621:Chemistry / Q000379:methods; D003486:Cyanides / Q000737:chemistry*; D006860:Hydrogen Bonding; D007477:Ions / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D011522:Protons; D013050:Spectrometry, Fluorescence / Q000379:methods; D013053:Spectrophotometry / Q000379:methods; D013055:Spectrophotometry, Infrared / Q000379:methods
chemical_list: D003486:Cyanides; D007477:Ions; D011522:Protons; D007501:Iron