| dc.description.abstract | We have designed and synthesized a series of quinoxaline derivatives Q1, Q2, Q3, Q4, Q5 that quinoxaline is used for chromophore. The sensors have hydrazine, hydrazone, and imine functional group. All of them can be as anion sensor’s recognition site which can interaction with anion like hydrogen bonding or deprotonation. In UV-Visable spectra, we can find the quinoxaline chromophore’s absorbance is down by adding anion.
In fluorescence spectra, we can find the quinoxaline chromophore’s fluorescence is quenching by adding anion. especially the sensor Q2, we can find the quinoxaline chromophore’s fluorescence is by adding F-, Cl-, Br-, I-. In nmr titration experiments, we can find the sensors interact with anion is hydrogen bonding or deprotonation, even if the sensors can use hydrocarbon of the quinoxaline chromophore and bind with anions with hydrogen bonding. The sensors Q3 and Q5 have clearly color change wuth F-, OH-, CN-. The sensor Q4 have rhenium metal which is transition metal and which can make the sensor’s hydrogen more acid, and then the sensor can have much stronger interaction with anion. The reason results the sensor Q4’s selectivity more bad. The sensors Q1 and Q2 have hydroxyl functional groups and we find the selectivity compared with the semsor Q1and Q2 is worse
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