RESUMEN
A simple indole-based receptor 1 was prepared by a simple Schiff-base reaction of 1H-indole-3-carbaldehyde with ethane 1,2-diamine and its fluoroionophoric properties toward anions were investigated. Indole-based receptor 1 acts as a selective turn-on fluorescent sensor for HSO4(-) in methanol among a series of tested anions. Fluorescence spectroscopy, ultraviolet and nuclear magnetic resonance imaging support that the HSO4(-) indeed interacted with imine nitrogen and the proton of nitrogen in indole ring.
Asunto(s)
Aniones/química , Indoles/química , Mediciones Luminiscentes/métodos , Espectrometría de Fluorescencia/métodos , Sulfatos/química , Fluorescencia , Mediciones Luminiscentes/instrumentaciónRESUMEN
Sugar-aza-crown ether-based cavitand 1 can act as a selective turn-on fluorescence sensor for hydrogen sulfate ion in methanol among a series of tested anions. Spectroscopic studies, particularly NMR spectroscopy, revealed that the C-H hydrogen bonding between 1,2,3-triazole ring of cavitand 1 and hydrogen sulfate ion is crucial for the high selectivity of the receptor for hydrogen sulfate.
Asunto(s)
Colorimetría/métodos , Colorantes Fluorescentes/química , Teoría Cuántica , Sulfatos/análisis , Iones , Espectroscopía de Resonancia Magnética , Modelos Moleculares , Sulfatos/químicaRESUMEN
A sugar-aza-crown ether (SAC)-based fluorescent sensor 4 was prepared. It contains a pyrene as the fluorophore and its fluoroionophoric properties toward transition metal ions were investigated. Chemosensor 4 exhibits highly selective recognition toward Cu(2+) and Hg(2+) ions among a series of tested metal ions in methanol solution. The association constants for 4*Cu(2+) and 4*Hg(2+) in methanol solution were calculated to be 7.4×10(1)M(-1) and 4.4×10(3)M(-1), respectively. Chemosensor 4 formed complexes with the Cu(2+) or Hg(2+) ion at a 1:1 ligand-to-metal ratio with a detection limit of 1.3×10(-4)M Cu(2+) and 1.26×10(-5)MHg(2+), respectively.