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Sensors 2012, 12(4), 4421-4430; doi:10.3390/s120404421
Article

2:1 Multiplexing Function in a Simple Molecular System

1
, 1
, 2
, 1,* , 1
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, 1,* , 1,*  and 2,*
1 School of Chemical Biology and Pharmaceutical Sciences, Capital Medical University, Beijing 100069, China 2 Beijing National Laboratory for Molecular Sciences, State Key Lab of Rare Earth Materials Chemistry and Applications & PKU-HKU Joint Lab in Rare Earth Materials and Bioinorganic Chemistry, Peking University, Beijing 100871, China
* Authors to whom correspondence should be addressed.
Received: 31 December 2011 / Revised: 18 February 2012 / Accepted: 12 March 2012 / Published: 30 March 2012
(This article belongs to the Section Physical Sensors)
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Abstract

1-[(Anthracen-9-yl)methylene] thiosemicarbazide shows weak fluorescence due to a photo-induced electron transfer (PET) process from the thiosemicarbazide moiety to the excited anthracene. The anthracene emission can be recovered via protonation of the amine as the protonated aminomethylene as an electron-withdrawing group that suppresses the PET process. Similarly, chelation between the ligand and the metal ions can also suppress the PET process and results in a fluorescence enhancement (CHEF). When solvents are introduced as the third control, a molecular 2:1 multiplexer is constructed to report selectively the inputs. Therefore, a molecular 2:1 multiplexer is realized in a simple molecular system.
Keywords: fluorescence; anthracene; molecular 2:1 multiplexer fluorescence; anthracene; molecular 2:1 multiplexer
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Xu, S.; Hao, Y.-X.; Sun, W.; Fang, C.-J.; Lu, X.; Li, M.-N.; Zhao, M.; Peng, S.-Q.; Yan, C.-H. 2:1 Multiplexing Function in a Simple Molecular System. Sensors 2012, 12, 4421-4430.

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