1987 Volume 1987 Issue 11 Pages 2138-2143
As amphiphilic salcomine derivatives expected for an oxygen adducts, N, N'-disalicylidene-2-hexadecyl-1, 3-propanediamine complexes of cobalt(II), nickel(II) and copper (II) were synthesized and monolayers of these compounds were spread on distilled water. From the measurements of the surface pressure-area isotherms, it was found that the Co complex can form the most stable condensed monolayer. The Co and Ni complexes showed the limiting molecular area of about 65A2 while the Cu complex gave about 98A2, suggesting different orientations of the head group in the monolayers. Using the Langmuir-Blodgett method, the Y-type monolayer assembly of each complex can be obtained. The polarized UV, visible and IR spectra of the LB films suggested that the functional group of the Co and Ni complexes are oriented with the long axis parallel to the surface and the short axis nearly to vertical, whereas both axis of Cu complex are considerably inclined. Thus, the different orientations of the complex in the LB films of the amphiphilic salcomine derivatives can be realized by the choice of the proper metal species. This phenomenon is interesting for a model of dioxygen carriers in the biological systems.
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