4-Isobutyl homologs of farnesyl bacteriochlorophyll c in carbon tetrachloride |
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Authors: | John M Olson |
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Institution: | (1) Institute of Biochemistry, Odense University, Campusvej 55, DK-5230 Odense M, Denmark |
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Abstract: | Absorption (ABS) and circular dichroism (CD) spectra were recorded for 3 concentrations (2.3, 19 and ca. 75 M) of 4-isobutyl homologs. Monomer spectra were the same as those for 4-n-propyl-5-ethyl farnesyl bacteriochlorophyll c. Pure polymer spectra were obtained by subtracting the 2.3- M spectra appropriately scaled from the ca. 75- M spectra. The polymer showed an ABS peak at 742 nm and a CD trough at ca. 742 nm. These properties are in harmony with the aggregate model proposed by Smith KM, Kehrs LA and Fajer J (1983, J Am Chem Soc 105: 1387–1389). A log-logplot of absorbance at 742 nm vs. monomer concentration could be fitted by a straight line of slope 1.6.Abbreviations ABS
absorbance
- BChl
bacteriochlorophyll
- CD
circular dichroism
- iBM/EF
4-isobutyl-5-methyl/ethyl farnesyl
- PEF
4-n-propyl-5-ethyl farnesyl |
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Keywords: | bacteriochlorophyll c Chlorobium limicola chlorosome circular dichroism green photosynthetic bacteria |
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