Synthesis and anion recognition properties of thiosemicarbazone based molecular tweezers

摘要

A series of novel thiosemicarbazone based molecular tweezers were synthesized and studied as anion-binding receptors. Contrasting our former work, some of these receptors not only have considerable selectivity to H2PO4-, as well as F- and CH3COO-. When adding F-, CH3COO- and H2PO4 anions to their solutions respectively, the color has shown striking changes from colorless to yellow or dark yellow. The binding abilities of the receptors are according with the acidities of the N-Hgroups on the thiourea moiety, which are determined by the electronegatiuity of subgroups on them. Job plot indicated that 1:1 stoichiometry complex are formed between receptors and anions.