Triazole linked picolylimine conjugate of calix[6]arene as a sequential sensor for La3+ followed by F-.
A new 1,3,5-tris-triazole linked picolylimine conjugate of calix[6]arene (L) has been shown to be selective toward La(3+) by turn on fluorescence with ∼70-fold enhancement and emits blue, with a minimal detection limit of 65 ± 5 ppb (490 nM). The species of recognition has been modeled computationally to have a monocapped twisted square antiprism with a N(6)O(3) binding core about La(3+). The in situ complex of L with La(3+) recognizes F(-) via fluorescence quenching. The reversible response of sensing La(3+) and F(-) sequentially by L has been demonstrated.
Department of Chemistry, Indian Institute of Technology, Powai, Mumbai-400076, India.
V V Sreenivasu
VV
Mummidivarapu
Anita
A
Nehra
Vijaya Kumar
VK
Hinge
Chebrolu P
CP
Rao
D047250:Calixarenes / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000032:analysis / Q000737:chemistry*; D005461:Fluorine / Q000032:analysis / Q000737:chemistry*; D007097:Imines / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D007811:Lanthanum / Q000032:analysis / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D010636:Phenols / Q000737:chemistry*; D014230:Triazoles / Q000737:chemistry*
D005456:Fluorescent Dyes; D007097:Imines; D007477:Ions; D010636:Phenols; D014230:Triazoles; C476540:calix(6)arene; D047250:Calixarenes; D005461:Fluorine; D007811:Lanthanum