FTIR Study on Molecular Mechanism of the Interactions between Rare Earth Ions and Dipalmitoylphosphatidylcholine Cast dry Film

Fourier transform infrared spetroscopy was used to Study the molecular interactions between Sm³⁺. Gd³⁺. Er³⁺ and Yb³⁺ and DPPC in cast dry film. The results indicate that Ln³⁺ have electrostatic interactions with DPPC multibilayer dry film. On raising the Ln³⁺ molecular ratio, the interactional degree was increasing; Meanwhile the electrostatic interactions become stronger in the order of Sm³⁺ ＜ Gd³⁺＜Er³⁺ ＜Yb³⁺.