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Synthesis of a Phenylhydrazone‐based Colorimetric Anion Sensor with Complementary IMP/INH Logic Functions
Author(s) -
Uahengo Veikko,
Xiong Bi,
Zhou Nana,
Cai Ping,
Hu Kai,
Cheng Gongzhen
Publication year - 2012
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201200149
Subject(s) - chemistry , naked eye , hydrazone , titration , absorbance , ion , colorimetry , stereochemistry , inorganic chemistry , chromatography , organic chemistry , detection limit
A dinitrophenyl hydrazone colorimetric anion sensor (receptor 1 ) was synthesized and its recognition properties towards various anions were investigated by naked eye observation and spectroscopic methods, namely UV‐vis and 1 H NMR titrations in DMSO. The addition of AcO − , F − and H 2 PO 4 − to receptor 1 resulted in marked red shift of the charge‐transfer absorbance band (Δ λ= 91 nm, 407 nm to 498 nm) concomitant with a 'naked‐eye' detectable colour change from yellow to pink. However, both the colour and spectral changes were reversible by the addition of cations (M II ) of 3d 5‐10 as well as Cd II , Hg II , Mg II and Ca II . Subsequently, complementary IMP/INH logic functions based on colour and spectral switching (ON/OFF) were affirmed. The sensor can, thus be utilized as a colorimetric molecular switch modulated by F − /M II .