Reversible trilayer formation at the air -water interface from a mixed monolayer containing a cationic lipid and an anionic porphyrin

Article Abstract:

The molecular organization of a cationic matrix (DOMA) as influenced by the presence of an aniomic water-soluble porphyrin (TSPP), in the mixed monolayer, molar ratio TSPP/DOMA - 1:4 is studied by Pi-A isotherms, the reflection spectra, Brewster angle microscopy images, and imaging ellipsometry at the air-water interface. The formation of an aggregate of the porphyrin molecules under compression is inferred from the reflection spectra.

Lipids, Monomolecular films

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Porphyrin nanorods

Article Abstract:

Aggregates of the diacid form of tetrakis(4-sulfonatophenyl)porphine (TPPS) formed in acidic aqueous solutions are deposited onto hydrophilic and hydrophobic substrates and imaged using atomic force microscopy (AFM). The increasing ionic strength of aqueous solutions of H(sub 4) leading to the formation of either single rod-shaped aggregates with a height of 3.8 plusmn 0.3 nm or bundles of these same rods is described.

Analysis, Atomic force microscopy, Aqueous solution reactions

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Impact of electronic asymmetry on photoexcited triplet-state spin distributions in conjugated porphyrin oligomers probed via EPR spectroscopy

Article Abstract:

The photophysics of triplet excitons is studied along with electronically symmetric analogues. X-band electron paramagnetic resonance (ERP) spectroscopy is used for this purpose.

Electron paramagnetic resonance spectroscopy, Excited state chemistry, Oligomers

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