Abstract: The thin-layer chromatography behavior of dicyclopentadienyl ytterbium and dysprosium o-substituted benzoic acid derivatives is studied using silica gel Gplate impregnated with decane. The following rules have been obtained:1. The R_f values are decreased as the increasing of the electron donating ability of o-substituting group in the aromatic ring.2. The silica gel plate impregnated with decane diminishes the absorbing activity only, but has no effect on the behavior of absorption chromatography.3. The R_f values change in the opposite direction with the λ_max, values of ultraviolet spectrum for the series of compounds. The preliminary discussion is also made for this relationship in theory.

Key words: Modified thin layer plate, Ultraviolet spectrum R band, Mutual relationship