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- W2000404449 abstract "Low temperature (T= 10 K) site-selection fluorescence and excitation spectra of both isolated pheophorbide-a molecules (I PHEO) and pheophorbide covalently bonded to the synthetic l-lysyl-l-alanyl-l.-alanine polypeptide (B PHEO) were measured in dimethylformamide (DMF) matrices. The fluorescence spectra display sharp vibronic lines at different wavenumbers for different dye laser excitation wavelengths, superimposed on a broad band background. Spectral analysis provides frequencies of normal vibrations (FNV) and site distribution functions (SDF). The FNV and SDF of I PHEO in DMF have been found to show good agreement with other chlorophyll-like molecules. A covalent binding between the polypeptide and PHEO molecules produces only slight changes in FNV but significant broadenings and shifts to lower energies in SDF. The fluorescence spectra of I PHEO in a typical Shpolskii matrix (n-octane) were also measured and found to exhibit sharp non-shifting vibronic lines for all wavelengths and kinds of excitation. A general model explaining both site-selection and Shpolskii spectroscopy is presented." @default.
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- W2000404449 date "1985-05-01" @default.
- W2000404449 modified "2023-09-23" @default.
- W2000404449 title "SITE-SELECTION and SHPOLSKII SPECTROSCOPY OF MODEL PHOTOSYNTHETIC SYSTEMS" @default.
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- W2000404449 doi "https://doi.org/10.1111/j.1751-1097.1985.tb03617.x" @default.
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