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. 2005 Jan 25;102(4):971-4.
doi: 10.1073/pnas.0409145102. Epub 2005 Jan 18.

Mesoscopic self-organization of a self-assembled supramolecular rectangle on highly oriented pyrolytic graphite and Au(111) surfaces

Jian-Ru Gong  1 , Li-Jun Wan, Qun-Hui Yuan, Chun-Li Bai, Hershel Jude, Peter J Stang
Affiliations

Mesoscopic self-organization of a self-assembled supramolecular rectangle on highly oriented pyrolytic graphite and Au(111) surfaces

Jian-Ru Gong et al. Proc Natl Acad Sci U S A. .

Abstract

A self-assembled supramolecular metallacyclic rectangle was investigated with scanning tunneling microscopy on highly oriented pyrolytic graphite and Au(111) surfaces. The rectangles spontaneously adsorb on both surfaces and self-organize into well ordered adlayers. On highly oriented pyrolytic graphite, the long edge of the rectangle stands on the surface, forming a 2D molecular network. In contrast, the face of the rectangle lays flat on the Au(111) surface, forming linear chains. The structures and intramolecular features obtained through high-resolution scanning tunneling microscopy imaging are discussed.

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Figures

Fig. 1.
Fig. 1.
Chemical structure (A) and space-filling model (B), from a top and side view, of the rectangle.
Fig. 2.
Fig. 2.
STM images and structural model of the rectangle on HOPG. (A) Low-resolution image (Vbias = 758 mV, Itip = 684 pA) showing a STM image of HOPG in the lower left corner. (B) High-resolution image (Vbias = 876 mV, Itip = 691 pA. (C) A proposed structural model for the adlayer of the rectangle on HOPG surface.
Fig. 3.
Fig. 3.
STM images of the molecular rectangles on a HOPG substrate. (A) A large-scale (100 × 100 nm) STM image (Vbias = 859 mV, Itip = 667 pA) of the rectangle adlayer. (B) A composite STM image showing the underlying HOPG lattice and the rectangle adlayer simultaneously. The imaging conditions are Vbias = 859 mV, Itip = 667 pA for the molecular adlayer (Lower) and Vbias = 15 mV, Itip = 667 pA for HOPG lattice (Upper).
Fig. 4.
Fig. 4.
STM images and structural model of the molecular rectangles on Au(111). (A) A large-scale (60 × 60 nm) image (Vbias = –50 mV, Itip = 1.883 nA) of the rectangle adlayer. (B) High-resolution image (Vbias = –50 mV, Itip = 1.698 nA) of the rectangle adlayer, showing the underlying Au(111) lattice in the lower left corner, and an individual rectangle is shown in the upper right corner. (C) A proposed structural model for the adlayer of the rectangle on Au(111) surface. STM images were recorded in 0.1 M HClO4.
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