Abstract
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.
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