Journal
SMALL
Volume 3, Issue 6, Pages 1007-1014Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.200600497
Keywords
aggregation; chlorophyll; dyes; self-assembly; zinc chlorins
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The highly efficient, light-harvesting antennae systems present in chloro somes of green phototrophic bacteria, such as Chloroflexus aurantiacus, serve as a model for the design of bioinspired nanostructured materials. A semisynthetic zinc chlorin, derived from natural chlorophyll a, is used as a building block that self-assembles into excitonically coupled chromophore stacks. Temperature-dependent UV/Vis and circular dichroism spectroscopic measurements show the reversible formation of soluble chiral aggregates of this new zinc chlorin dye. High-resolution scanning tunneling microscopy and atomic force microscopy studies reveal the formation of two types of well-ordered ac-stacked aggregates on highly ordered pyrolytic graphite.
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