Synthesis,Organized Molecular Films And Applications Of New-type Amphiphilic Compounds

Two new-type amphiphilic ligands H2A, (H2A 12, H2A), derived from 8-aminoquinoline, and their complexes with copper, CuA (CuA, CuA), were synthesized and characterized by elemental analyses, IR, NMR, UV-visible spectroscopy in different concentrations and under different acidities. The effects of pH, metal ions and counterions containing in subphase on the surface pressure-area (it -A) isotherms were discussed. H2A can form monolayer on pure water subphase. The it -A isotherms of monolayers of H2A were investigated on different subphases. Acidity and counterions containing in subphases have little effect on the A isotherms. When metal ions such as Cu2+, Zn2+, Ni2+, Mn2+, Co2+,Cd2+, Fe2+, Pb2+, La3+, Hg2+5 Na+, Ca2+, and Mg2+ ions were introduced in subphases, all the metal ions but copper ion show the similar features as that on pure water subphase. Only copper ion has a special coordination with H2A and H2A at the air/water interface. The concentration of CuCl2 on subphase has an apparent effect on the coordination between H2A and Cu + ion. This coordination occurred in the concentration region of 5X1O-7 to 1X103mo1/L CuCI2 in the subphase. It not only causes an increase of collapse pressure (it max) but also changes the area per H2A of molecule (Ao). This coordination was confirmed by UV-visible spectra, X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES). Compared the UV-visible spectra of H2A LB films deposited from subphase containing Cu2+ ions with that from pure water subphase, a new band appeared due to this coordination. The characteristic peaks of Cu2+ ion can be seen in the XPS spectrum. In the concentration region of 1X10 to 1X1O4molIL CuC 12, + max and A0 value of H2A monolayer change markedly with the change of the concentration of CuC12. Furthermore, the absorbance of H2A-Cu LB films has a linear relationship to the concentration of CuC12 containing in subphases. It indicates that H2A may detect the copper ion concentration in this region and H2A LB film may be fabricated as a sensor of copper ion. The investigation of H2A and CuA as an emitter in electroluminescent device is in progress.