Author/Authors :
Kim، نويسنده , , Su Ho and Choi، نويسنده , , Jung Kyu and Kim، نويسنده , , Sung Kuk and Sim، نويسنده , , Wonbo and Kim، نويسنده , , Jong Seung، نويسنده ,
Abstract :
A new calix[4]arene-based fluorescence chemosensor displaying a strong excimer emission was prepared. When a Pb2+ ion is bound to the two amide oxygen atoms linked to the fluorophores, the ligand exhibits a marked quenched excimer emission due to its geometrical change during the complexation. By the addition of Ca2+ ion into the 1·Pb2+, the excimer emission band was revived, by which an interesting on/off switch process is proposed.
