Amphiphilic cyclodextrin carriers embedding porphyrins: Charge and size modulation of colloidal stability in heterotopic aggregates

Article Abstract:

The interaction between the anionic 5,10,15,20-tetrakis(4-sulfonatophenyl)-21H,23H-porphyrin (TPPS) and cationic vesicles formed by heptakis(2-omega-amino-O-oligo(ethylene oxide)-6-hexylthio)-beta-cyclodextrin (SC6CDNH2) is examined. The investigations are carried out through a combination of elastic light scattering (ELS), quasi-elastic light scattering (QELS), zeta potential measurements, and time resolved fluorescence anisotropy.

Anisotropy, Cyclodextrins

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Aggregation properties of hyperporphyrins with hydroxyphenyl substituents

Article Abstract:

The acidification of tetra(4-hydroxyphenyl)porphyrin (THPP) and tetrakis(3,5-dihydroxyphenyl)porphyrin (OHPP) in dichloromethane solutions is investigated as a function of the nature of the counteranion. A comparison with tetrakis(4-methoxyphenyl)porphyrin (TMPP) has shown the vital role played by the peripheral hydroxyl groups in stabilizing various porphyrin aggregates.

Fluorescence, Optical properties, Acid deposition, Ultraviolet spectroscopy, Chemical properties

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Nonlinear absorption and nonlinear refraction of self-assembled porphyrins

Article Abstract:

Nonlinear absorption and nonlinear refraction of self-assembled porphyrins in the nanosecond and picosecond regimes are studied at 532 nm by the Z-scan technique. An enhancement of nonlinear absorption is observed for the monomeric components of self-assembled structures by adding pyridine, while their nonlinear refractions remain almost unchanged as pyridine is added.

Science & research, Analytical Laboratory Instrument Manufacturing, Analytical instruments, Ultraviolet Spectrophotometers, Research, Usage, Refraction, Absorption spectra

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