Title:Synthesis and State of Hydroxy-substituted Porphyrins in Premicellar and Micellar Solutions of SDS
Volume: 29
Issue: 20
Author(s): Natalia Lebedeva, Elena Yurina, Sabir Guseinov, Irina Skorobogatkina, Yana Kibireva and Sergey Syrbu*
Affiliation:
- G.A. Krestov Institute of Solution Chemistry, Russian Academy of Sciences, Ivanovo 153045, Russian Federation
Keywords:
Porphyrins, SDS, micelles, localization, fluorescence, premicellar region.
Abstract: The use of micelles enables the resolution of a number of problems associated
with the aggregation and reduction in photocatalytic activity of porphyrins. The formation
of transport systems is impossible without information on the localization of porphyrins
containing hydrophilic and hydrophobic parts in highly organized systems, such as liposomes
or model systems–micelles. To solve the above issues, 5,10,15,20-tetra(3ʹ,4ʹ-
dihydroxyphenyl)porphin (Por(OH)8), 5-(3ʹ,4ʹ-dihydroxyphenyl)-10,15,20-triphenylporphin
(Por(OH)2), and 5-(3ʹ,4ʹ-dihydroxyphenyl)-10,15,20-tri(pyridinium-3ʹ-yl)porphine (PorN
(OH)2) were synthesized, and their state was studied in aqueous media in the presence of an
anionic surfactant in the premicellar region. It was found that the porphyrins are sedimentation-
stable in the premicellar region, while in the micellar region, Por(OH)2 and
PorN(OH)2 are localized inside SDS micelles. However, the peripheral substituents of PorN(OH)2 are oriented
toward the "head" of the surfactant. Por(OH)8 is the worst isolated from water molecules of all the studied porphyrins,
and can be located both on the surface and inside the micelle, orienting the OH groups toward the surface
of the micelle, or the channels inside it. The results obtained can be used to design transport systems for the
delivery of hydroxy-substituted porphyrin photosensitizers.