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. 2019 Feb 6;13(2):1385–1393. doi: 10.1021/acsnano.8b06885

Figure 7.

Figure 7

Coordination-restricted dehydrogenative coupling of 1,4-BPyB on Au(111) with coordinated Fe atoms. (a) Coordinated honeycomb network formed by three-fold coordination of 1,4-BPyB and Fe atoms. (b) Detailed STM image of the coordinated network. (c) Molecular model of a coordinated trimer. (d) Compound network emerging after triggering the dehydrogenative coupling at 350 K. Such network is composed of well-organized pristine 1,4-BPyB and product D through three-fold coordination interaction. (e) Close-up image showing details of the compound network of octagonal cavities in panel d. The contour of a product D has been marked in white. (f) Schematic diagram interpreting the molecular structure of product D and the formation of compound network with D as the only product. (g, h) Calculated reaction path and energies of different intermediate states based on a pyridine ring on Au(111) with one coordinated Fe atom and one free Au adatom. The white arrows in panels a and d point to [11̅0] direction. Scanning parameters: (a, d) constant-current mode, Vb = 0.5 V, It = 30 pA; (b) constant-height mode, Vb = 50 mV, It = 60 pA; (e) constant-height mode, Vb = 10 mV, It = 70 pA.