Per-6-ammonium-β-cyclodextrin/ p-nitrophenol complex as a colorimetric sensor for phosphate and pyrophosphate anions in water

Using per-6-ammonium-β-cyclodextrin (per-6-NH 3 +-β-CD) as an anion binding site and p-nitrophenol as a spectroscopic probe, a colorimetric sensor is developed for phosphate and pyrophosphate anions in water. Per-6-NH 3 +-β-CD forms a 1:2 inclusion complex with p-nitrophenol as characterized by NOES...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2011-07, Vol.155 (2), p.909-914
Main Authors: Azath, Ismail Abulkalam, Suresh, Palaniswamy, Pitchumani, Kasi
Format: Article
Language:English
Subjects:
Actuators
Anions
Aqueous medium
Binding sites
Color
Colorimetric anion sensor
Colorimetry
electrospray ionization mass spectrometry
electrostatic interactions
p-Nitrophenol
Per-6-ammonium-β-cyclodextrin
Phosphate
Phosphates
Pyrophosphate anions
Sensors
Spectra
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Summary:Using per-6-ammonium-β-cyclodextrin (per-6-NH 3 +-β-CD) as an anion binding site and p-nitrophenol as a spectroscopic probe, a colorimetric sensor is developed for phosphate and pyrophosphate anions in water. Per-6-NH 3 +-β-CD forms a 1:2 inclusion complex with p-nitrophenol as characterized by NOESY and ESI-MS spectra and it undergoes a distinct color change from colorless to intense yellow upon exposure to phosphate or pyrophosphate anions over other anions including perchlorate, ATP 2−, ADP 2− and AMP 2−. The seven ammonium groups of 1, bind phosphate (characterized by ESI-MS) or pyrophosphate anions specifically by electrostatic interaction. This naked eye sensing is significant for very low concentration (5 × 10 −5 M) of anion with 1:2 ratio of host and guest.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2011.01.041