Monolayer and Langmuir-Blodgett films of amphiphilic complexes with 8-hydroxyquinoline

A series of amphiphilic complexes of N-octadecyl-8-hydroxy-2-quinoline carb oxamide, M(HO)(2) (M = Mg, Ca, Mn, Ni, Zn, Pb), form a stable monolayer on a pure water subphase and can be easily fabricated as fairly stable uniform LB films. Absorption spectra and low-angle X-ray diffraction measurements showed that these LB films had good homogeneity and were Y-type bilayer fil ms. From the position of the Bragg peaks, a thickness of ca. 5.38 similar t o 5.63 nm per bilayer were obtained. X-ray photoelectron spectroscopy analy sis reveals a M:C:N ratio in the LB films consistent with the M(HO), on sto ichiometry. These LB films exhibit intense fluorescence and may be used as emitting material of electroluminescent devices. (C) 1998 Elsevier Science Limited. All rights reserved.