Liquid-phase systems with specified properties based on water-soluble derivatives of cobalt (II) phthalocyanine

Abstract

In this work a wide range of sulfo derivatives of cobalt phthalocyaninewas used as an example for the creation of liquid-phase systems with specified parameters. The role of the spacer bridge in the peripheral position of the macrocycle on its aggregation and coordination properties is illustrated. It was found that associated forms (H-associates) of sulfonated metal phthalocyanines, in which the ionic peripheral group is removed from the macrocycle by oxynaphthyl-/oxyphenylazo-fragments (CoTSPc2 and CoTSPc3, respectively), have absorption in the region of 620-630 nm, while the Q-band of the monomeric form is located in the region 680-700 nm. It is shown that in the concentration range of 10−5 – 10−4 M the change in the optical density for CoTSPc1 and CoTSPc2is described by a linear law. Based on the position of the absorption maxima of the Q-band, phthalocyanines are in an aggregated form in the form of H-aggregates. The study of the coordination properties of macrocycles was carried out with the addition ofbidentate DABCO molecule. The stability of monoligand complexes with DABCO in aqueous solution changes in the order CoTSPc1 > CoTSPc3 > CoTSPc2.