Synthesis and Characterization of Bis-Rhodamine Appended Fluorescent Pd2+ Chemosensor

  • 林 健勤

Student thesis: Master's Thesis


A bis-rhodamine appended Schiff base derivative (BRI) has been designed as colorimetric as well as fluorescent sensor for the selective detection of Pd2+ The synthesis and the spectroscopic sensing characterization of the BRI probe were carried out The probe BRI exhibited high sensitivity and selectivity towards Pd2+ in solution of acetonitrile/water (3:2 v/v) In the presence of Pd2+ BRI exhibited obvious absorption at 556 5 nm and fluorescence emission at 591 nm Those peaks increased with increasing of Pd2+ concentration Results of ion selectivity show that the intensity of the BRI-Pd2+ complex was not affected by the presence of other metal ions 1H-NMR and FT-IR spectroscopic investigations of BRI and BRI-Pd2+ revealed that the -C=N- groups and spirolactam of rhodamine B are capable of coordinating cation guest species Furthermore Job’s plot profile exhibited that each BRI may coordinate with 1 8 Pd2+ ions under the conditions Based on these results a schematic representation of BRI coordinated with two Pd2+ ions was proposed It was found that coordination of BRI with Pd2+ ions caused ring opening of BRI Emission of fluorescence could be due to the formation of long conjugation construction of ring-opening BRI The coordination behaviors of BRI were reversible Addition of sodium sulfide into the system may cause the releasing of Pd2+ leads to the ring-closing of BRI probe
Date of Award2016 Aug 17
Original languageEnglish
SupervisorJui-Hsiang Liu (Supervisor)

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