Supramolecular organization of crown- and phosphoryl-containing magnesium and zinc phthalocyaninates in solutions of synthetic and natural surfactants

Supramolecular assemblies based on crown- and phosphoryl-substituted phthalocyanines and their metal complexes in microheterogeneous media

“…The anionic surfactants SDS and BS diff er in the structure of micelles and in the number of the micelle-forming surfactant molecules. 44 In PBS, specifi c features of BS had almost no eff ect on the EAS of compound 4 in the microheterogeneous medium. The spectra of the systems 4-BS-PBS were characterized by close values of the extinction coeffi cient for the Q-band and demonstrated some features that were mentioned above for the spectrum of the system 4-SDC-PBS (see Fig.…”

“…10, spectrum 1). 44 In organized microheterogeneous media (supramolecular assemblies) containing oppositely charged surfactants ([surfactant] > cmc) phthalocyaninate 4 exists as monomer, which is confi rmed by its EAS recorded in the presence of cationic surfactant CTAB (spectrum 2) and anionic surfactant SDC (spectrum 3). The absorption spectrum of 4 in micellar solutions of CTPB obeys the same pattern as the spectrum of the system 4-CTAB (see Fig.…”

“…Similarly to the spectrum of magnesium phthalocyaninate 1d in micellar solutions of SDC 43 the EAS of 1d in the presence of SC also changes (spectrum 2). 44 The addition of NaCl to the system 1d-SC causes an increase in the optical density of the Q-band and the appearance of an isosbestic point on the long-wavelength side (spectra 3-5). Zinc phthalocyaninate 1e behaves analogously.…”

“…46 Zinc phthalocyaninate 4 bearing phosphonate peripheral substituents is almost insoluble in water, being, however, soluble in the phosphate buff er (PBS, рН 7.4). 44 Based on the results of potentiometric titration of 1,5-bis-[2-(oxyethoxyphosphoryl)-4-ethylphenoxy]-3-oxapentane 47 with phosphoryl-containing fragments, one can assume that compound 4 forms a multiply charged anion in PBS. The position of the Q-band in the EAS of this phthalocyaninate ( max = 644 nm) suggests that it mainly exists in the form of Н-dimers (Fig.…”

“…The last-mentioned value suggests that compound 4 exists in the micellar solution containing SDC not only as monomer, but also as Н-dimer. 44 Peculiar features of solubilization of zinc phthalocyaninate 4 were studied using solutions of SDS and BS (SC, SDC, taurine-conjugated STC and STDC). The anionic surfactants SDS and BS diff er in the structure of micelles and in the number of the micelle-forming surfactant molecules.…”