Recently, the LB films based on rare earth metals have a high attractiveness for many researchers. Previously, we have studied the complex formation of Co (II) and Ni(II) with the monolayers of octadecane-2,4-dione [1]. In this work, we start study of the complex formation of Eu (III) and Tb (III) with the monolayers of amphiphilic β-diketones (Fig. 1) and prepare the LB films based on this structure.
Fig. 1 The structure forms of amphiphilic β-diketones (a - octadecane-2,4-dione; b – 3-tetradecylheptadecane-2,4-dione; c – 3-acetylnonadecane-2,4-dione; d – 3-heptadecyl-3-phenilpentane-2,4-dione
We investigated the complex formation of Eu (III) and Tb (III) ions in the monolayer of β-diketones as a function of concentration of the metal ions in the subphase (pH = 5.9). In the case of the subphase containing Eu3+ and Tb3+, the area per molecule was significantly increased compared to metal ions- free subphase. It indicates the formation of the complex in the monolayer. In the monolayer creates the steric strain due to the complexes formation. This can be confirmed dependences of molecular area and collapse pressure of the monolayer β-diketone as a function of concentration Eu3+ and Tb3+ ion in the subphase. This dependences is clearly illustrate a more broadening of the monolayer of complex Tb (III) than Eu (III).
arhiiren@inbox.ru
[1] Repina I.N., Sokolov M.E., Panyushkin V.T. Investigation of complex formation of cobalt(II) with molecular Langmuir layers of octadecan-2,4-dione // The Journal of Physical Chemistry C. 2012, V. 116, pp. 5554 - 5557.
This work supported by a grant from the Russian Foundation for Basic Research.
arhiiren@inbox.ru
