title: Optical determination of thallium(I) and cesium(I) with a fluorogenic calix[4]arenebis(crown-6 ether) containing one pendent dansyl group.
abstract: A fluorogenic derivative of 1,3-alternate calix[4]arenebis(crown-6) (1) containing a dansyl group in the proton-ionizable side arm has been employed in selective sensing of Tl+ and Cs+ at low concentration levels in MeCN-H2O (1:1) mixed solvent. Optical recognition of these two metal cations by 1 occurs in contrasting modes. On the basis of the results of fluorescence, matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS), and 1H NMR studies, Tl+ and Cs+ react with 1 via formation of 1:1 complexes that differ in coordination arrangement around the metal ion.
authors.affiliation: Department of Chemistry, Howard University, 525 College Street, NW, Washington, District of Columbia 20059, USA.
authors.forename: Ebony D
authors.initials: ED
authors.lastname: Roper
authors.forename: Vladimir S
authors.initials: VS
authors.lastname: Talanov
authors.forename: Maryna G
authors.initials: MG
authors.lastname: Gorbunova
authors.forename: Richard A
authors.initials: RA
authors.lastname: Bartsch
authors.forename: Galina G
authors.initials: GG
authors.lastname: Talanova
mesh_terms: D002412:Cations / Q000032:analysis; D002586:Cesium / Q000032:analysis*; D043844:Crown Ethers / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008856:Microscopy, Fluorescence / Q000379:methods*; D055095:Optics and Photonics; D010713:Phosphatidylcholines / Q000737:chemistry; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D013793:Thallium / Q000032:analysis*
chemical_list: C520515:1,3-alternate calix(4)arenebis(crown-6); C496906:1-myristoyl-2-(12-((5-dimethylamino-1-naphthalenesulfonyl)amino)dodecanoyl)-sn-glycero-3-phosphocholine; D002412:Cations; D043844:Crown Ethers; D005456:Fluorescent Dyes; D010713:Phosphatidylcholines; D002586:Cesium; D013793:Thallium