An anionic chromogenic sensor based on the competition between the anion and a merocyanine solvatochromic dye for calix[4]pyrrole as a receptor site
The interaction of Brooker’s merocyanine ( BM), a merocyanine dye, with calix[4]pyrrole ( CP) was studied in acetonitrile. BM is violet in solution, but its interaction with CP changes the color of the solution due to the formation of CP– BM species associated through hydrogen bonding. A displacemen...
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Published in | Tetrahedron letters Vol. 48; no. 26; pp. 4547 - 4551 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
25.06.2007
|
Subjects | |
Online Access | Get full text |
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Summary: | The interaction of Brooker’s merocyanine (
BM), a merocyanine dye, with calix[4]pyrrole (
CP) was studied in acetonitrile.
BM is violet in solution, but its interaction with
CP changes the color of the solution due to the formation of
CP–
BM species associated through hydrogen bonding. A displacement assay was then carried out in the presence of different anions (F
−, Cl
−, Br
−, I
−,
H
2
PO
4
-
,
HSO
4
-
, and
NO
3
-
). It was verified that F
−, and to a lesser extent Cl
− and
H
2
PO
4
-
, displace
BM through the formation of a complex with
CP, coloring the solution. Addition of
HSO
4
-
makes the solution almost colorless because it is sufficiently acidic to transfer a proton to
BM, removing it from the receptor site in
CP and protonating the dye, thereby allowing the visual detection of the anion in relation to the other anions. |
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ISSN: | 0040-4039 1873-3581 |
DOI: | 10.1016/j.tetlet.2007.04.141 |