Organic Molecular Beam Deposition of Oligophenyls on Au(111): A Study by X‐ray Absorption Spectroscopy

Abstract

Near-edge X-ray absorption fine structure (NEXAFS) spectroscopy has been applied to reveal the molecular arrangement of ultrathin oligophenyl films [p-quaterphenyl (4P) and p-hexaphenyl (6P)] on Au(111). In the half-monolayer films the molecules lie flat on the surface but still have a considerable inter-ring twist of 30 degrees -40 degrees , similar to the gas-phase conformation. In the saturated monolayer film the second half of the molecules is side-tilted by an angle of less than 66 degrees with respect to the surface. This arrangement is already similar to that in bulk net planes of thicker films parallel to the surface, that is, the 4P(211) and 6P(21-3) planes, respectively.

Surface-assisted diastereoselective Ullmann coupling of bishelicenes

“…This conclusion is consistent with the planar adsorption geometry of p-hexaphenyl on Au(111). 35 Note that the unoccupied frontier orbitals simulated using extended Hückel theory after geometry optimization of (M,M)-2 on a single Cu(100) layer ( Fig. 2d) agree very well with the observed STM contrast, thereby confirming the assignment of the sense of helicity of the two helical subunits.…”

Uniform π‐System Alignment in Thin Films of Template‐Grown Dicarbonitrile‐Oligophenyls

“…Furthermore, Müllegger et al measured OMBE grown thin fi lms of quaterphenyl and found a significantly less pronounced dichroism compared to our case. [ 16 ] The authors showed that such a weak angle-dependence is consistent with the typical herringbone packing of oligophenyl molecules.…”

The Molecular Orientation of para‐Sexiphenyl on Cu(110) and Cu(110) p(2×1)O

“…[8] On clean gold the first organic layer consists of flat lying molecules and lying molecules which have their molecular planes tilted by 668 with respect to the substrate. [9] In contrast, on the carbon precovered substrate the molecular plane tilt is constant in the monolayer, but their relative in-plane orientation is randomly distributed due to the lack of order in the graphitic layer. An other approach is to deposit molecules with functional groups (i.e.…”