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À propos de : Fluorescent Anion Sensor Derived from Cholic Acid:The Use of Flexible Side Chain        

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  • Fluorescent Anion Sensor Derived from Cholic Acid:The Use of Flexible Side Chain
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  • The fluorescent photoinduced electron transfer (PET) chemosensors 1−3 were synthesized fromcholic acid. 1 and 2 containing amidothiourea groups as anion receptive sites demonstrated muchhigher affinity toward anions than 3 containing traditional thiourea H-bond donating group.Comparative studies on their binding affinity toward carboxylates, dihydrogen phosphate, andhalides revealed that the amidothiourea moiety on the C17 side chain could work cooperativelywith H-bond donating groups on C7 and C12 to bind spherical halogen anions. An unexpectedspecific fluorescence enhancement of 1 by coordinating bromide ion was observed.
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