Anisotropic organization and microscopic manipulation of self-assembling synthetic porphyrin microrods that mimic chlorosomes: Bacterial light-harvesting systems

Cyril Chappaz-Gillot, Peter L. Marek, Bruno J. Blaive, Gabriel Canard, Jochen Bürck, Gyozo Garab, Horst Hahn, Tamás Jávorfi, Loránd Kelemen, Ralph Krupke, Dennis Mössinger, Pál Ormos, Chilla Malla Reddy, Christian Roussel, Gábor Steinbach, Milán Szabó, Anne S. Ulrich, Nicolas Vanthuyne, Aravind Vijayaraghavan, Anita ZupcanovaTeodor Silviu Balaban

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

Being able to control in time and space the positioning, orientation, movement, and sense of rotation of nano- to microscale objects is currently an active research area in nanoscience, having diverse nanotechnological applications. In this paper, we demonstrate unprecedented control and maneuvering of rod-shaped or tubular nanostructures with high aspect ratios which are formed by self-assembling synthetic porphyrins. The self-assembly algorithm, encoded by appended chemical-recognition groups on the periphery of these porphyrins, is the same as the one operating for chlorosomal bacteriochlorophylls (BChl's). Chlorosomes, rod-shaped organelles with relatively long-range molecular order, are the most efficient naturally occurring light-harvesting systems.(1, 2) They are used by green photosynthetic bacteria to trap visible and infrared light of minute intensities even at great depths, e.g., 100 m below water surface or in volcanic vents in the absence of solar radiation. In contrast to most other natural light-harvesting systems, the chlorosomal antennae are devoid of a protein scaffold to orient the BChl's; thus, they are an attractive goal for mimicry by synthetic chemists, who are able to engineer more robust chromophores to self-assemble. Functional devices with environmentally friendly chromophores-which should be able to act as photosensitizers within hybrid solar cells, leading to high photon-to-current conversion efficiencies even under low illumination conditions-have yet to be fabricated. The orderly manner in which the BChl's and their synthetic counterparts self-assemble imparts strong diamagnetic and optical anisotropies and flow/shear characteristics to their nanostructured assemblies, allowing them to be manipulated by electrical, magnetic, or tribomechanical forces.

Original languageEnglish
Pages (from-to)944-954
Number of pages11
JournalJournal of the American Chemical Society
Volume134
Issue number2
DOIs
Publication statusPublished - Jan 18 2012

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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    Chappaz-Gillot, C., Marek, P. L., Blaive, B. J., Canard, G., Bürck, J., Garab, G., Hahn, H., Jávorfi, T., Kelemen, L., Krupke, R., Mössinger, D., Ormos, P., Reddy, C. M., Roussel, C., Steinbach, G., Szabó, M., Ulrich, A. S., Vanthuyne, N., Vijayaraghavan, A., ... Balaban, T. S. (2012). Anisotropic organization and microscopic manipulation of self-assembling synthetic porphyrin microrods that mimic chlorosomes: Bacterial light-harvesting systems. Journal of the American Chemical Society, 134(2), 944-954. https://doi.org/10.1021/ja203838p