Atropisomer-specific formation of premicellar porphyrin J-aggregates in aqueous surfactant solutions

Abstract

reduced fluorescence yield (an approximately one-third reduction relative to ethanol) are observed for the premicellar 4,0-THex J-aggregates relative to the monomer.

Analysis by partial reflection spectrometry of protonated tetraphenylporphyrin adsorbed at a liquid–liquid interface

“…According to the discussion on the relationship between bandshift mode and aggregation type [11,12], such a spectrum may be derived from a co-adsorption of H-and J-type aggregates or from a T-type (zigzag) aggregate. Regardless, it would be more reasonable to assign it to the J-type aggregate in the present case, since our reflection spectra resemble the flow-induced dichroic spectrum for J-aggregate of water-soluble porphyrin, 5,10,15,20-tetra(4-sulfophenyl) porphyrin (H 2 TPPS 4 4-) in an acidic form, (H 4 TPPS 4 2-) 11 with a slipped face-to-face stacking [13].…”

Size Controlled Synthesis of Gold Nanoparticles by Porphyrin with Four Sulfur Atoms

“…In comparison with a mixture of 1 and HAuCl 4 in DMF (Fig. 2b), the Soret band of GN:1 was broadened and red-shifted, suggesting that 1 stacked on gold nanoparticles side by side [20]. Figure 3a shows a typical high resolution transmission electron microscopy (HRTEM) image and histogram of GN:1.…”

An observation of the coexistence of multimers and micelles in a nonionic surfactant C10E4 solution by dynamic light scattering

“…A water solubility enhancement of insoluble compounds was observed in nonionic and ionic surfactant solutions (Barber et al, 1991;Kano et al, 1991;Kile and Chiou, 1989). The dimerization of oleate in aqueous solutions resulted a decrease of slope in g-log C curve at increasing concentration (g = surface tension, C = surfactant concentration) (Somasundaran et al, 1984).…”