1. Department of Chemistry, Ji′nan University, Guangzhou 510632, China 2. Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080，China
Abstract：The coordination of monolayer of amphiphilic ligands, N, N-bis(8-quinolinyl)alkyl propanediamide, H2A(alkyl=dodecyl, H2A12; hexadecyl, H2A16) with Cu2＋ at air-water interface was investigated by X-ray Photoelectron Spectroscopy (XPS) and UV-Ｖis spectra.The collapse pressure of the monolayers of H2A12 and H2A16 increased from 12.5 and 15.6 mN·m-1 to 28.0 and 33.8 mN·m-1 after their coordination with Cu2＋ ions, respectively. XPS indicated that the coordination ratio between H2A and Cu2＋ was 1∶1. The binding energies of Cu2p were 935 and 955 eV. The Langmuir-Blodgett(LB) films of H2A12 and H2A16 can be used as transporting materials in three-layer electroluminescence devices: ITO/TPD/LB films/Alq3/Al. The driving voltages were 6.5 and 7.5 V, the maximum luminances were 621 and 201 cd·m-2, respectively.
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