A sugar-aza-crown ether-based fluorescent sensor for Cu~(2+) and Hg~(2+) ions

摘要

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 4Cu ~(2+) and 4Hg~(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) M Hg~(2+), respectively.