title: Thiacalix[4]crown based optical chemosensor for Fe3+, Li+ and cysteine: a Fe3+/Li+ ion synchronized allosteric regulation.
abstract: A heteroditopic chemosensor 2 based on a thiacalix[4]crown with a 1,3-alternate conformation has been synthesized and shows a selective fluorescence turn-off response with Fe(3+) ions in mixed aqueous media. Furthermore, the 2-Fe(3+) complex can be used as a chemosensing system for the detection of Li(+) and cysteine based on two different approaches. Moreover, the sequence addition of Fe(3+) and Li(+) triggers an Fe(3+)/Li(+) switchable on-off-on fluorescence chemosensor with negative allosteric regulations.
authors.affiliation: Department of Chemistry, UGC Sponsored Centre for Advanced Studies-1, Guru Nanak Dev University, Amritsar, Punjab, India. mksharmaa@yahoo.co.in
authors.forename: Manoj
authors.initials: M
authors.lastname: Kumar
authors.forename: Naresh
authors.initials: N
authors.lastname: Kumar
authors.forename: Vandana
authors.initials: V
authors.lastname: Bhalla
mesh_terms: D000494:Allosteric Regulation; D047248:Crown Compounds / Q000737:chemistry*; D003545:Cysteine / Q000032:analysis*; D005290:Ferric Compounds / Q000032:analysis*; D005456:Fluorescent Dyes / Q000737:chemistry; D007477:Ions / Q000737:chemistry; D008094:Lithium / Q000032:analysis*; D011789:Quantum Theory; D013056:Spectrophotometry, Ultraviolet
chemical_list: D047248:Crown Compounds; D005290:Ferric Compounds; D005456:Fluorescent Dyes; D007477:Ions; D008094:Lithium; D003545:Cysteine