title: Monitoring of photoluminescence decay by alkali and alkaline earth metal cations using a photoluminescent bolaamphiphile self-assembly as an optical probe.
abstract: Photoluminescence (PL) decay induced by the displacement of an ionic fluorescence component, Tb(3+), with alkali and alkaline earth metal cations was investigated using photoluminescent spherical self-assemblies as optical probes. The photoluminescent spherical self-assembly was prepared by the self-organization of a tyrosine-containing bolaamphiphile molecule with a photosensitizer and Tb(3+) ion. The lanthanide ion, Tb(3+), electrically bound to the carboxyl group of the bolaamphiphile molecule, was displaced by alkali and alkaline earth metal cations that had stronger electrophilicity. The PL of the self-assembly decayed remarkably due to the substitution of lanthanide ions with alkali and alkaline earth metal cations. The PL decay showed a positive correlation with cation concentration and was sensitive to the cation valency. Generally, the PL decay was enhanced by the electrophilicity of the cations. However, Ca(2+) showed greater PL decay than Mg(2+) because Ca(2+) could create various complexes with the carboxyl groups of the bolaamphiphile molecule. Microscopic and spectroscopic investigations were conducted to study the photon energy transfer and displacement of Tb(3+) by the cation exchange. This study demonstrated that the PL decay by the displacement of the ionic fluorescent compound was applied to the detection of various cations in aqueous media and is applicable to the development of future optical sensors.
authors.affiliation: Department of Chemical and Biomolecular Engineering, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, Republic of Korea.
authors.forename: Sunhyung
authors.initials: S
authors.lastname: Kim
authors.affiliation: Department of Chemical and Biomolecular Engineering, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, Republic of Korea.
authors.forename: Jinyoung
authors.initials: J
authors.lastname: Kwak
authors.affiliation: Department of Chemical and Biomolecular Engineering, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, Republic of Korea. Electronic address: leessy@yonsei.ac.kr.
authors.forename: Sang-Yup
authors.initials: SY
authors.lastname: Lee
mesh_terms: D000468:Alkalies / Q000737:chemistry*; D002412:Cations / Q000737:chemistry*; D005663:Furans / Q000737:chemistry*; D049449:Luminescence; D008163:Luminescent Measurements / Q000379:methods*; D008673:Metals, Alkaline Earth / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D015335:Molecular Probes / Q000737:chemistry*; D017319:Photosensitizing Agents / Q000737:chemistry; D011728:Pyridones / Q000737:chemistry*; D020156:Salicylic Acid / Q000737:chemistry; D013050:Spectrometry, Fluorescence
chemical_list: D000468:Alkalies; D002412:Cations; D005663:Furans; D008673:Metals, Alkaline Earth; D015335:Molecular Probes; D017319:Photosensitizing Agents; D011728:Pyridones; C543575:bolaamphiphile; D020156:Salicylic Acid
keywords: Bolaamphiphile; Cation; Photoluminescence; Self-assembly