摘要
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 1H NMR titrations in DMSO. The addition of AcO？, F？ and H2PO4？ to receptor 1 resulted in marked red shift of the charge-transfer absorbance band （Δλ=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 （MII） of 3d5-10 as well as CdII, HgII, MgII and CaII. 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？/MII.
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 1H NMR titrations in DMSO. The addition of AcO？, F？ and H2PO4？ to receptor 1 resulted in marked red shift of the charge-transfer absorbance band （Δλ=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 （MII） of 3d5-10 as well as CdII, HgII, MgII and CaII. 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？/MII.
