title: Optical chemosensor for Ag+, Fe3+, and cysteine: information processing at molecular level.
abstract: A thiacalix[4]arene based chemosensor 3 bearing two pyrene groups has been synthesized which demonstrates ratiometric sensing with Ag(+) and fluorescence quenching with Fe(3+) ions in mixed aqueous media. The 'in situ' prepared Ag(+) and Fe(3+) complexes showed high selectivity toward cysteine. The molecular switching between three chemical inputs (Ag(+), Fe(3+), cysteine) results in various molecular logic gates which have been integrated sequentially to generate a sequential information processing device.
authors.affiliation: Department of Chemistry, UGC-Center for Advance Studies-1, Guru Nanak Dev University, Amritsar, Punjab, India. mksharmaa@yahoo.co.in
authors.forename: Manoj
authors.initials: M
authors.lastname: Kumar
authors.forename: Rajesh
authors.initials: R
authors.lastname: Kumar
authors.forename: Vandana
authors.initials: V
authors.lastname: Bhalla
mesh_terms: D047250:Calixarenes / Q000737:chemistry; D003545:Cysteine / Q000032:analysis* / Q000737:chemistry; D005290:Ferric Compounds / Q000032:analysis* / Q000737:chemistry; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000737:chemistry*; D010636:Phenols / Q000737:chemistry; D011721:Pyrenes / Q000138:chemical synthesis* / Q000737:chemistry; D012834:Silver / Q000032:analysis* / Q000737:chemistry; D013050:Spectrometry, Fluorescence
chemical_list: D005290:Ferric Compounds; D009942:Organometallic Compounds; D010636:Phenols; D011721:Pyrenes; C121325:calix(4)arene; D047250:Calixarenes; D012834:Silver; D003545:Cysteine