A novel pyrene-Schiff base fluorescent ‘turn on’ sensor toward Zn2+ and Al3+ with aggregation-induced emission enhancement

  • 許 秉豐

Student thesis: Master's Thesis


A novel fluorescent sensor PySb comprising of pyrene moiety as the fluorophore benzene ring as the spacer and 2-(hydroxymethyl)propane-1 3-diol as the ionophore was synthesized PySb itself exhibited weak fluorescence due to photoinduced electron transfer (PET) It can serve as a highly selective and sensitive fluorescent ‘turn on’ sensor toward (a) Zn2+ in ethanol solution (λem = 470 nm) and (b) Al3+ in DMSO solution (λem = 458 nm) The complexes of PySb-Zn2+ and PySb-Al3+ were further supported by 1H NMR spectra The 1:2 stoichiometry between PySb and Zn2+ was obtained from Job plot Excellent detection limit toward Zn2+ (2 39×10-8 M) was derived from titration experiment Similarly the binding constant toward Zn2+ was estimated as 2×109 M-1 based on titration experiment PySb-Zn2+ complex in DMF solution showed aggregation-induced emission enhancement with increasing content of ethanol (0-99%) It could be utilized as a fluorescent sensor in a wide range of pH (3-11) Green emission of PySb (λem = 515 nm) was observed when pH was higher than 12 due to intramolecular charge transfer (ICT)
Date of Award2016 Jul 15
Original languageEnglish
SupervisorYun Chen (Supervisor)

Cite this