Abstract
The properties of 12 new heterodi- and heterotrinuclear complexes having general formulae [Cu2Ln(L)2(NO3)(H2O)2](NO3)2·3H2O [where Ln = Pr (1), Nd (2), Sm (3) and Eu (4)], and [CuLn(L)(NO3)2(H2O)3MeOH]NO3·MeOH [where Ln = Gd (5), Tb (6), Dy (7), Ho (8), Ef (9), Tm (10), Yb (11) and Lu (12)], and their main ligand [L = C19H18N2O4Br2 = N,N’-bis(5-bromo-3-methoxysalicylidene)propylene-1,3-diamine] have been characterized by chromatographic analyses. The parameter of relative lipophilicity (R M0) of the tested compounds was determined experimentally by reversed-phase high-performance thin layer chromatography method with mixtures of methanol and water as a mobile phase. We also described interactions between chromatographed substances and various surfaces (silica—SiO2 and modified by hydrocarbon chains—RP-2, RP-8, RP-18 phases). This study also investigates the effect of pH of the mobile phase on the retention on the polar stationary phase. Thin layer chromatography combined with magnetic and electric field has been proposed as a complementary method for the determination of physicochemical properties of the investigated compounds. The chromatograms in the field and outside of it were developed simultaneously in three identical chromatographic chambers. One of them was placed in external magnetic field of 0.4 T inductivity, and the second in external electrical field. In magnetic and electric fields, retention of some complexes changed, which indicated that the presence of these fields influenced physicochemical properties of the compounds and their interactions with the stationary phase.
Highlights
The chemistry of coordination compounds is an important and challenging area of modern chemistry
The relative lipophilicity of 12 complex compounds with Schiff bases as a main ligand was determined by RP-2 High‐Performance Thin Layer Chromatography (HPTLC) with mixtures of methanol and water as mobile phase
In order to develop the knowledge about the various compounds forms, we studied the retention changes in three different environments: retic velocity is opposite to the direction on the mobile phase in cathode side and the same in anode side (Fig. 5a); 2. when the retention is stronger in the anode side than cathode, it means that chromatographed substances may be negatively charged, since electrophoretic velocity is opposite to the direction on the mobile phase in anode side and the same in cathode side (Fig. 5b); 3. when the retention is practically the same on both sides, it may mean that the substance is neutral
Summary
The chemistry of coordination compounds is an important and challenging area of modern chemistry. There has been a growing interest in the synthesis, structure and physicochemical properties of heteronuclear compounds containing simultaneously 3d and 4f metal centers due to the variety of their potential applications mainly in bioinorganic chemistry [2,3,4,5,6], magnetochemistry [7, 8], separation processes, luminescence, environmental chemistry, electrochemistry and catalysis [9] These kinds of compounds belong to molecular magnets being used for the generation of energy and its storage and for the production of charge-transfer superconductors to be characterized by high electrical conductivity at low temperature. Concluding, in presented work, thin layer chromatography being combined with magnetic and electric fields has been proposed as complementary method for the determination of physicochemical properties of investigated coordination compounds. Novel Schiff base derivatives were analyzed with the same mobile phase as in the magnetochromatography
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