Structure and Conformation of Individual Molecules upon Adsorption of a Mixture of Benzoporphyrins on Ag(111), Cu(111), and Cu(110) Surfaces
Rajan Adhikari, Jan Brox, Stephen Massicot, Michael Ruppel, Norbert Jux, Hubertus Marbach, Hans‐Peter Steinrück- Physical and Theoretical Chemistry
- Atomic and Molecular Physics, and Optics
Abstract
We investigated the adsorption behavior of a mixture of six 2H‐tetrakis‐(3, 5‐di‐tert‐butylphenyl)(x)benzoporphyrins (2H‐diTTBP(x)BPs, x=0, 1, 2‐cis, 2‐trans, 3, and 4) on Ag(111), Cu(111) and Cu(110) at room temperature by scanning tunneling microscopy (STM) under ultra‐high vacuum conditions. On Ag(111), we observe an ordered two‐dimensional square phase, which is stable up to 400 K. On Cu(111), the same square phase coexists with a stripe phase, which disappears at 400 K. In contrast, on Cu(110), 2H‐diTTBP(x)BPs adsorb as immobile isolated molecules or dispersed short chains along the [1