ИСТИНА

Development of molecular machines and switches is on the foremost edge of the nowadays science. Crown-phthalocyanines attract the attention of the researchers as the very promising platform for formation of molecular machines because of their intensive absorbance in visible range and its high sensitivity to external influence as well as their ability to form different supramolecular ensembles. In this work we present synthesis and investigation of supramolecular aggregation of 24-crown-8-substituted phthalocyanine and ist metal complexes (Mg(II), Zn(II), Cu(II), Ni(II)) with viologens as the first step towards creation of new electrochemically-driven molecular machines. It was shown that addition of viologen to MgPc and ZnPc solution leads to slight bathochromic shift of the Q-band in UV-Vis spectra (Fig. 1) which can evidence the formation of J-aggregates. However, in the same conditions for H2Pc, CuPc and NiPc significant hypsochromic shift of the Q-band occurred (Fig. 2) that can testify the formation of cofacial dimers. The difference can be explained by the presence of axial ligands in the molecules of MgPc and ZnPc which prevent the formation of cofacial dimers as it was earlier shown on similar compounds1. Also it was shown that supramolecular aggregation strongly depends on the solvents and concentration of the solutions. The most prominent results were shown in the mixture of CH2Cl2 with acetone at the concentrations of 10-4.