Fluorescent ratiometry of tetrahomodioxacalix[4]arene pyrenylamides upon cation complexation.
[structure: see text] C-1,2-alternate tetrahomodioxacalix[4]arene pyreneamides were synthesized. Pb(2+) coordination gave a quenched monomer and excimer fluorescence emission, while upon Ca(2+) ion binding, the receptor provides an enhanced excimer and declined monomer emission with ratiometric response. The excimer emission spectra changes are rationalized by frontier molecular orbitals that the effective Py-Py interaction induces emission intensity increases upon Ca(2+) ion complexation, whereas there is no such interaction observed upon Pb(2+) binding.
Choi
Jung Kyu
JK
Department of Chemistry, Institute of Nanosensor & Biotechnology, Dankook University, Seoul 140-714, Korea.
Lee
Areum
A
Kim
Seyoung
S
Ham
Sihyun
S
No
Kwanghyun
K
Kim
Jong Seung
JS