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ABSTRACT
Two amphiphilic bis-amide tetradenate ligands based on 8-aminoquinoline, N,N′-bis(8-quinolinyl)alkylpropanediamide (H2A) [alkyl: dodecyl (H2A12) and hexadecyl (H2A16)], were synthesized and characterized by Fourier transform infrared (FT-IR) 1H-Nuclear magnetic resonance (1H NMR), and Ultraviolet-visible (UV-vis) spectroscopy. H2A can form stable monolayers. The interactions between the H2A monolayer and metal ions such as the main group of metallic ions (Mg2+, Ca2+, Pb2+) and transitional metallic ions (Mn2+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+, Hg2+, and La3+) were investigated. Only the Cu2+ ion has special coordination with H2A monolayers. This coordination has been clearly proved by means of the π-A isotherms, X-ray photoelectron spectroscopy, and UV-vis spectroscopy. The selective copper binder of the Langmuir–Blodgett (LB) film of H2A may be developed as a sensor of copper ion. H2A16 LB film can detect the concentration of Cu(II) ion in the region of 1.0 × 10−7 ∼ 1.0 × 10−6 mol dm−3.
ACKNOWLEDGMENTS
This research work was supported by the Natural Science Foundation of China, the Key Project of Natural Science Foundation of Guangdong Province (Grant Nos. 2001C31401 and 013202), and Foundation of State Key Laboratory of Materials Chemisrty and Applications of Peking University of China.