title: Novel lanthanide pH fluorescent probes based on multiple emissions and its visible-light-sensitized feature.
abstract: A new type of Eu(III) ofloxacin complex as the fluorescent pH indicator has been presented. Compared to pure ligand, the complex offers more distinguished color changes (green-red-blue) derived from both lanthanide line emissions and the secondary ionization steps of ofloxacin. During the concentration dependence experiments, the photoluminescence studies on the complex showed that the excitation of this pH probe can occur at a very long wavelength which extends to visible range (Ex=427 nm). Furthermore, the functional complex was successfully incorporated into soft networks and two novel luminescent hydrogels (rod and film) were fabricated. The soft materials also exhibited specific responses towards the pH variation. Finally, the onion cell-stain experiments were carried out to further confirm the validity of pH dependence and the results support the idea that the material will be suitable for monitoring biological samples in the future.
authors: School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China.
authors: Jintai
authors: J
authors: Lin
authors: School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China. Electronic address: yhzheng78@scnu.edu.cn.
authors: Yuhui
authors: Y
authors: Zheng
authors: Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China; School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China; Guangzhou Key Laboratory of Materials for Energy Conversion and Storage, Guangzhou 510006, PR China; State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, PR China. Electronic address: qmwang@scnu.edu.cn.
authors: Qianming
authors: Q
authors: Wang
authors: School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China.
authors: Zhi
authors: Z
authors: Zeng
authors: Departments of Physiology and Developmental Biology, University of Texas Southwestern Medical Center, Dallas, USA.
authors: Cheng Cheng
authors: CC
authors: Zhang
mesh_terms: D005456:Fluorescent Dyes / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D008027:Light; D015242:Ofloxacin / Q000737:chemistry; D066244:Proton Magnetic Resonance Spectroscopy
chemical_list: D005456:Fluorescent Dyes; D028581:Lanthanoid Series Elements; D015242:Ofloxacin
keywords: Europium; Fluorescence probe; Hydrogel; Ofloxacin; pH value