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Chronological Change from Face‐On to Edge‐On Ordering of Zinc–Tetraphenylporphyrin at the Phenyloctane–Highly Oriented Pyrolytic Graphite Interface
Author(s) -
Sakano Takeshi,
Hasegawa Junya,
Higashiguchi Kenji,
Matsuda Kenji
Publication year - 2012
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201100587
Subject(s) - materials science , highly oriented pyrolytic graphite , porphyrin , pyrolytic carbon , alkoxy group , monolayer , phase transition , crystallography , scanning tunneling microscope , tetraphenylporphyrin , phase (matter) , ostwald ripening , chemical physics , condensed matter physics , nanotechnology , chemistry , photochemistry , organic chemistry , physics , alkyl , pyrolysis
The self‐assembled structure of alkoxy‐ and N ‐alkylcarbamoyl‐substituted zinc–tetraphenylporphyrin at the liquid–highly oriented pyrolytic graphite (HOPG) interface was observed by using scanning tunneling microscopy. The alkoxy porphyrin showed a phase transition from face‐on to edge‐on ordering. The phase transition requires the close‐packed structure of alkoxy porphyrin. The chronological change of the ordering was traced to show the existence of several types of Ostwald ripening including two‐step phase transition from small edge‐on to face‐on and then further to edge‐on orderings. On the other hand, the N ‐alkylcarbamoyl porphyrin showed persistent edge‐on ordering, and the ordering was analyzed by the Moiré pattern. Although the edge‐on ordering is observed only in the nonpolar solvent, the orderings have potential applications in the charge and energy transfer.