Abstract
Zinc complex of methyl 3 1-octadecyl-bacteriopheophorbide- d was prepared from modification of naturally occurring chlorophyll- a. The 3 1-epimerically pure samples were obtained by HPLC separation and their stereochemistry including the absolute configuration at the secondary alcoholic 3 1-position was determined by combination of esterification to methoxy(trifluoromethyl)phenylacetate and NMR spectroscopy (Mosher's method). Both the epimers were monomeric in a polar organic solvent and self-aggregated in a non-polar solvent to give oligomers as well as dimers possessing red-shifted visible absorption bands. Visible spectra of the non-polar organic solutions were dependent upon the 3 1-chirality and such a diastereoselective control on the self-aggregation led to the formation of self-aggregates with different supramolecular structures.
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