The molecular interactions between Nd3+, Gd3+and Yb3+ and DPPC in multibilayer have been studied by Fourier transform infrared spectroscopy. The results show that incorporations of the lanthanide ions considerably shift the gel to liquid-crystal phase transition to higher temperatures. The incorporations of Gd3+ and Yb3+ obviously reduce the cooperations of the transition. The phosphate region of the spectra indicates that the Ln3+ binding to DPPC forms DPPC-Ln3+complex and the Lna3+binding is not dependent on the phase state of DPPC. The C-H stretching region of the spectra suggests that the incorporation of Ln3+increases the conformational order of DPPC both in gel and in liquid-crystal phase as a result of the reduction of gauche rotamers.
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