The water-soluble compound L modified by mono-nitrogen heterocyclic ring was synthesized from acetylacetone,ethylenediamine and N-methylimidazole by aldehyde-amine condensation and bromide reaction,and characterized by 1H-NMR,13C-NMR and FT-IR.The coordination properties of L with metal cations (Na+,K+,Cd2+,Co2+,Cu2+,Mn2+,Ni2+,Zn2+,Pb2+) were studied by UV absorption spectroscopy.The chemical coordination ratio of L and Pb2+and detection limit were investigated,and the effects of solvent,time and pH value on the recognition properties of L to Pb2+ were discussed.The results showed that aqueous solution of L can quickly coordinated with Pb2+ in a stoichiometric ratio of 1∶1 after 30 minutes,and UV absorption intensity after L and Pb2+ coordination decreased significantly.The detection limit was 5×10-5mol/L.In the allowable range of error,L can be used to detect Pb2+ of actual samples.In a word,L is a kind of chemical probe which can be used to identify Pb2+ selectively in organic system and water system.
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基金资助
国家自然科学基金(51473045)
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