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• W1981009794 abstract "In this work we report on the influence of the polarity of the environment on the optical properties of octa-α-butyloxy-H 2 phthalocyanine ( H 2 PC ( OBu ) 8 ) in organic solvents and liposomes using steady-state absorption as well as time correlated single photon counting (TCSPC). A change was found in Q-band absorption in various solvents. Taking into account that the absorption properties of H 2 PC ( OBu ) 8 are modulated by the polarity of the direct surrounding, polarities inside micro-heterogeneous systems can be probed. This was demonstrated for liposomes of dipalmitoylphosphatidylcholine (DPPC), with regard to the behavior during the phase transition between the gel and liquid-crystal state. Absorption spectra of H 2 PC ( OBu ) 8 embedded in DPPC-liposomes have been recorded in the temperature range from 15 to 70 °C, covering the phase transition region at about 36–39 °C. The Q-band absorption at temperatures below and above the phase transition resembles those in polar and non-polar solvents, respectively. Measurements of fluorescence lifetime confirm this equivalence. We explain this behavior by a change of the localization of the dye molecules inside the membrane. For H 2 PC ( OBu ) 8 embedded in DPPC-liposomes we demonstrated by using optical methods that the position of the dye molecules strongly depends on the phase-state of the phospholipid. In addition, H 2 PC ( OBu ) 8 can be used as a probe for phase transition processes taking advantage of the specific behavior in surroundings with different polarity." @default.
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• W1981009794 date "2001-09-01" @default.
• W1981009794 modified "2023-09-25" @default.
• W1981009794 title "Observation of the phase transition in phospholipid liposomes taking advantage of the particular optical properties of octa-α-butyloxy-H2phthalocyanines" @default.
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• W1981009794 doi "https://doi.org/10.1002/jpp.374" @default.
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