SuPrAMOLECuLAr CHEMISTry
7
Table 3. ph determination of commercial vinegar using Bipy-NDis as ph chemosensor.
Compound
Sample 1
Glass electrode
r.S.D. %
Sample 2
Glass electrode
r. S. D. %
1B
1C
1D
2.55
2.62
2.96
2.51
2.51
2.51
1.58
4.28
16.10
2.55
2.58
2.85
2.45
2.45
2.45
4.00
5.16
15.09
under the same conditions. First, a calibration of curve in
acetate buffer was elaborated for each BIPy-NDI (Figure 8),
and then was determinate the pH values of BIPy-NDIs
solutions prepared using the commercial vinegar as sol-
vent. The results obtained with fluorescent method and
the glass electrode measure are compared in Table 3. Is
noteworthy that BIPy-NDI 1B presented the best results
with a r.S.D. % of 1.58 for sample 1 and 4.00 for sample 2,
while with BIPy-NDIs 1C and 1D r.S.D.% were higher. These
results are according with the competitive experiment for
1B due to its fluorescence intensity is not affected by the
presence of other cationic species.
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In this paper, we have presented evidence of PET pro-
cess in BIPy-NDIs in aqueous media. On the basis of the
present investigation it can assumed that the BIPy-NDI
1B is suitable for developing a pH chemosensor based
on the quenching of PET processes at low concentration
and pH range between 1.7 and 4.1. The BIPy-NDIs testing
with commercial samples show that the pH chemosen-
sor based on BIPy-NDI 1B offers the advantages of ade-
quate sensitivity, accuracy and rapid detection of pH. The
results are according with the data of conventional glass
electrode method. The sensor proposed shows excellent
stability, high reproducibility, and a short response time.
The method may be useful for constructing pH-sensitive
fluorescence chemosensor.
Supplemental material
Supplemental data for this article can be accessed online
Acknowledgements
The authors gratefully acknowledge Dr. Manuel Flores for his
support in the writing of this manuscript.
Disclosure statement
No potential conflict of interest was reported by the authors.
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ORCID
Georgina Pina-Luis