title: Central metal dependence of conformation and self-assembly of porphyrins on Ag(110).
abstract: The conformation and self-assembly of tertiary-butylphenyl substituted free-base and metal porphyrins (M-TBPP) on Ag(110) have been investigated as a function of the central metals (M = 2H, Cu, Pt, Ni, Zn, and Co) using scanning tunneling microscopy and low-energy electron diffraction. In the case of M = Cu, Pt, Ni, and Zn, a metastable adsorption structure is formed by the deposition below about 270 K and irreversibly transformed into a stable one after thermal annealing above 280 K. Nevertheless, we find that 2H- and Co-TBPP molecules do not exhibit structural transformation even after thermal annealing. The distinct adsorption behaviors should be related mainly to the porphyrin-substrate interactions depending on the central metal in M-TBPP.
authors.affiliation: Department of Nanoscience and Technology, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama 236-0027, Japan. tyoko@yokohama-cu.ac.jp
authors.forename: Takashi
authors.initials: T
authors.lastname: Yokoyama
authors.forename: Yuuki
authors.initials: Y
authors.lastname: Tomita