and 50973128), the ‘‘Bairen program’’ of CAS, and the
Shanghai Science and Technology Committee (Grant Nos.
09XD1405000 and 08JC1421900).
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BA (red). Both of them were in chloroform-d solution; tetramethyl-
silane (TMS) was used as an internal standard.
The reversibility of this sensor system was also investigated.
Fig. 1d illustrates the time-dependent fluorescence responses
of PdTPP/PFO film to saturated vapor of BA at 25 1C.
Obviously, PdTPP/PFO film could be regenerated after heating
under vacuum for 12 h to release amines.
In conclusion, a sensitive, selective, reversible, and easy
performance way of detecting electron donating volatile
amines such as abused drug MAPA has been reported. Highly
fluorescent PFO was used to generate an optical signal,
TPP and MTPP were receptors both as quenchers of PFO
and binding sites for amines. The fluorescence of PFO was
dramatically recovered after an electron donating amine was
bound to the receptors, which resulted in the ‘‘turn-on’’
fluorescent signal. Different amines have different electron
donating ability as well as diverse binding intensity with
MTPP, which bring on the selectivity. The reported fluorescent
sensor system based on a ‘‘turn-on’’ mechanism represents a
new simple, instant way for chemical sensors.
We thank the research programs from the Ministry
of Science and Technology of China (Program No.
2007AA06A408, 2009BAK64B03, 2009BAK43B15), the
National Natural Science Foundation of China (No. 60977067
c
7538 Chem. Commun., 2010, 46, 7536–7538
This journal is The Royal Society of Chemistry 2010