Abstract
Optical spectroscopy in the UV and visible ranges, dynamic light scattering, and 1H NMR spectroscopy are used to study monomerization of magnesium octa[(4′-benzo-15-crown-5)oxy]phthalocyaninate (Mgcr8Pc) in aqueous solutions of anionic surfactants: sodium dodecyl benzenesulfonate, sodium bis-(2-ethylhexyl)sulfosuccinate, and sodium deoxycholate (SDBS, AOT, and SDC, accordingly). Structural differences in surfactant molecules determine organization of Mgcr8Pc molecules in microheterogeneous media. It is found that Mgcr8Pc is in a monomeric form in aqueous SDBS solutions at concentrations in the range of CMC1 to CMC2 (critical micelle concentration) and it is in a dimeric and/or aggregate form at concentrations below CMC1. In AOT/water solutions (direct micelles) or hexane/AOT (0.1 M)/water (inverted micelles), Mgcr8Pc is solubilized forming dimeric and/or aggregate forms. In micellar solutions of SDC, the Mgcr8Pc monomer is predominantly formed in the presence of NaCl. The results obtained using the NMR spectroscopy technique agree with the binding of Mgcr8Pc by SDBS micelles similar to solubilization of phthalocyanine by micellar solutions of sodium dodecyl sulfate.
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Original Russian Text © N.F. Goldshleger, A.V. Chernyak, A.S. Lobach, I.P. Kalashnikova, V.E. Baulin, A.Yu. Tsivadze, 2015, published in Fizikokhimiya Poverkhnosti i Zashchita Materialov, 2015, Vol. 51, No. 2, pp. 160–169.
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Goldshleger, N.F., Chernyak, A.V., Lobach, A.S. et al. Monomerization of crown-containing phthalocyanines in microheterogeneous organized systems. Prot Met Phys Chem Surf 51, 212–220 (2015). https://doi.org/10.1134/S2070205115020070
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DOI: https://doi.org/10.1134/S2070205115020070