Detection of Zinc Ion and Sulfion Using a Rhodamine B Hydrazide Fluorescent Probe Based on Sequential Response
  
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KeyWord:rhodamine  fluorescence molecular probe  systhesis  zinc ion  sulfion
  
AuthorInstitution
YANG Jun-qing,WU Fang-hui,LUO Xiang-rui,ZHU Hai-wei,YU Ai-min School of Chemistry and Chemical Engineering,Anhui University of Technology
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Abstract:
      A novel molecular probe of N-(2-hydroxy-5-chlorophenyl) based rhodamine B hydrazide(HCPRH) was synthesized through a simple two-step reaction.Then its structure and fluorescence response were studied.Addition of Zn2+ into N,N-dimethylformamide(DMF) solution containing HCPRH resulted in increasement of fluorescence,while a fluorescent color change from colorless to yellow could be observed promptly with naked eyes under 365 nm ultraviolet lamp,indicating that the probe HCPRH could be used for rapid,sensitive and naked eye recognition of Zn2+.Moreover,the fluorescence emission of this probe toward Zn2+ was hardly affected by other metal ions.The binding constant between HCPRH and Zn2+ was calculated by Benesi-Hildebrand equation,and the 1∶1 binding mode was proposed based on the Job's method.In addition,according to the experimental results of fluorescence titration,the difference value of fluorescent intensity was proportional to Zn2+ concentration in the range of 10-250 μmol/L with a detection limit of 3.6 μmol/L.Results showed that HCPRH could be used in detection of trace amount of Zn2+.Subsequent experimental studies also showed that this molecular probe could be successfully applied in the continuous fluorescence response toward Zn2+ and S2-.
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