Adsorption-induced conformational changes of porphyrin derivatives and formation of twin superstructures on a copper surface

T. Sekiguchi, Y. Wakayama, S. Yokoyama, T. Kamikado, S. Mashiko

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The adsorbed structures and assembly behavior of porphyrin derivatives on Cu substrates were studied using low-temperature scanning tunneling microscopy (STM). The STM images showed that a porphyrin molecule with four tert-butyl-phenyl groups (H2-TBPP) forms twin domains of a square superstructure. The deformation of H2-TBPP required to explain the STM images forms a pair of corresponding chiral conformations. The conformation determines which of the twin domains is formed. In contrast, porphyrin molecules with two tert-butyl-phenyl and two vinyl-phenyl groups (H2-TBPVPP) showed no form of ordered assembly due to the strong interaction between the vinyl-phenyl and substrate. STM observation showed that cis- and trans-H 2-TBPVPP undergo different conformational changes, leading to mirror and two-fold symmetry, respectively.

Original languageEnglish
Pages (from-to)393-397
Number of pages5
JournalThin Solid Films
Publication statusPublished - Oct 1 2004
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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