Conformation selective assembly of carboxyphenyl substituted
porphyrins on Au (111)

Takashi Yokoyama^a)
Graduate School of Integrated Science, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama
236-0027, Japan

Toshiya Kamikado, Shiyoshi Yokoyama, and Shinro Mashiko
Kansai Advanced Research Center, National Institute of Information and Communications Technology,
588-2 Iwaoka, Nishi-Ku, Kobe 651-2401, Japan

(Received 27 July 2004; accepted 28 September 2004)

The selective assembly of carboxyphenyl substituted porphyrins on the Au (1 1 1) surface has been
studied using scanning tunneling microscopy. We find that conformational isomers of the porphyrins
are induced upon adsorption and are selectively assembled into hydrogen-bonded supramolecular
clusters or wires on the surface. The conformation selective assembly is attributed to the coplanar
intermolecular interactions between hydrogen-bonded carboxyphenyl groups. © 2004 American
Institute of Physics. [DO1: 10. 1063/1.1819877]