NDLI: A fluorescent sensing membrane for iodine based on intramolecular excitation energy transfer of anthryl appended porphyrin

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A fluorescent sensing membrane for iodine based on intramolecular excitation energy transfer of anthryl appended porphyrin

Content Provider	Springer Nature Link
Author	Long, LiPing You, MingXu Wang, Hao Wang, YongXiang Yang, RongHua
Copyright Year	2009
Abstract	A single anthryl appended meso-tetraphenylporphyrin (TPP) dyad has been synthesized and applied in fluorescence sensing of iodine based on the intramolecular excitation energy transfer. The molecular recognition of the sensor is based on the interaction of iodine with inner anthracene moiety of the dyad, while the signal reporter for the recognition process is the TPP fluorescence quenching. Because the emission spectrum of anthracene is largely overlapped with the Soret band absorption of TPP, intramolecular excitation energy transfer interaction occurs between the donor, anthracene and acceptor, TPP. This energy transfer leads to TPP fluorescence emission by excitation of anthracene. The sensor was constructed by immobilizing the dyad in a plasticized poly(vinyl chloride) (PVC) membrane. The sensing membrane shows higher sensitivity compared to the sensors by using anthracene, TPP, or a mixture of anthracene and TPP as sensing materials. Under the optimum conditions, iodine in a sample solution can be determined from 2.04 to 23.6 mmol·L$^{−1}$ with a detection limit of 33 nmol·L$^{−1}$. The sensing membrane shows satisfactory response characteristics including good reproducibility, reversibility and stability, as well as the short response time of less than 60 s. Except for Cr$_{2}$O 7 2− and MnO 4 − , other common metal ions and anions in foodstuff do not interfere with iodine determination. The proposed method was applied in the determination of iodine in table salt samples. The results agree well with those obtained by other methods.
Starting Page	793
Ending Page	801
Page Count	9
File Format	PDF
ISSN	10069291
Journal	Science in China Series B: Chemistry
Volume Number	52
Issue Number	6
e-ISSN	18622771
Language	English
Publisher	SP Science in China Press
Publisher Date	2009-05-20
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	fluorescence sensor energy transfer iodine Chemistry/Food Science
Content Type	Text
Resource Type	Article
Subject	Chemistry

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