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- W69765894 abstract "Micelles have been used as simple model systems to simulate the electrostatic and hydrophobic interactions found in biological membranes and in the haem cavity. The authors continue in the report on both the optical and transient excited state behavior of metalloporphyrins as probes of micellar environments. For NiPP (nickel protoporphyrin IX) they have compared porphyrin optical propertie such as the [alpha]/[beta] ratio, and the Gouterman A[sub 1g] parameter to those of Orange OT and the solvent probe E[sub T](30) in an attempt to gauge the influence of the micellar environment on porphyrin reactivity and conversely, the porphyrins effect on the aggregation behavior of the surfactant monomers and their formation of micelles. The results of optical and transient Raman experiments indicate that at low surfactant concentrations the porphyrin is primarily aggregated. Increases in the surfactant concentration up to the CMC caused continuous changes in the optical properties of the probe molecules. However, the relatively large changes in the value of E[sub T](30), which was used to probe the electrostatic properties of the micelle, are not reflected in the transient excited state vibrational behavior of NiPP. Studies on NiPP in various micellar systems, in which the porphyrin was monomeric, have lead tomore » the conclusion that in anionic, cationic, nonionic, or reverse micelles the porphyrin resides mainly in the hydrophobic region of the micelle.« less" @default.
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- W69765894 title "Spectroscopic studies of metalloporphyrins in micellar systems" @default.
- W69765894 hasPublicationYear "1992" @default.
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