Self-assembled single- and double-stack pi-aggregates of chlorophyll derivatives on highly ordered pyrolytic graphite.
The highly efficient, light-harvesting antennae systems present in chlorosomes 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 pi-stacked aggregates on highly ordered pyrolytic graphite.
Huber
Valerie
V
Universität Würzburg Institut für Organische Chemie and Röntgen Research Center for Complex Material Systems, Am Hubland, 97074 Würzburg, Germany.
Lysetska
Marina
M
Würthner
Frank
F
D002734:Chlorophyll / Q000031:analogs & derivatives* / Q000737:chemistry*; D002942:Circular Dichroism; D006108:Graphite / Q000737:chemistry*; D018625:Microscopy, Atomic Force; D016252:Microscopy, Scanning Tunneling; D008958:Models, Molecular; D011166:Porphyrins / Q000138:chemical synthesis / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D053545:Spirulina / Q000737:chemistry; D013696:Temperature
D011166:Porphyrins; D002734:Chlorophyll; C006969:chlorin; D006108:Graphite