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Spectrochim Acta A Mol Biomol Spectrosc. 2015 Sep 5;148:78-84. doi: 10.1016/j.saa.2015.03.109. Epub 2015 Apr 3.

A colorimetric and absorption ratiometric anion sensor based on indole & hydrazide binding units.

Author information

1
State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for Research and Development of Fine Chemicals, Guizhou University, Guiyang 550025, People's Republic of China.
2
State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for Research and Development of Fine Chemicals, Guizhou University, Guiyang 550025, People's Republic of China. Electronic address: baoxp_1980@aliyun.com.

Abstract

A colorimetric and absorption ratiometric anion sensor (L) based on indole and hydrazide binding units was designed and synthesized, and its recognition & sensing properties towards different anions were studied by naked-eye observations, UV-vis and (1)H NMR titration spectra. Sensor L could selectively recognize biologically important F(-), AcO(-) and H2PO4(-) in DMSO over other anions, along with a significant change in its color and absorption spectrum, resulting from the formation of corresponding 1:2 (L/F(-)) and 1:1 (L/AcO(-) and L/H2PO4(-)) complexes. The (1)H NMR titration experiments proved that sensor L experienced deprotonation of NH fragment and produced [HF2](-) species, whereas a stable H-bonding complex was formed in the presence of AcO(-) and H2PO4(-).

KEYWORDS:

Absorption ratiometry; Colorimetric sensor; Hydrazide NH; Indole

PMID:
25875028
DOI:
10.1016/j.saa.2015.03.109
[Indexed for MEDLINE]

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