报告摘要：

The combination of high-resolution AFM using CO functionalized tips [1,2] with atomic manipulation offers the possibility to custom-design individual molecules by making and breaking bonds with the tip of the microscope and directly characterizing the products on the atomic scale.

We recently generated and studied reaction intermediates and investigated chemical reactions trigged by atomic manipulation [3-5]. We formed radicals by dissociation and reversibly triggered ring-opening and -closing reactions via atomic manipulation (see Figure). By STM and AFM we address long-standing debates about the structure, charge distribution, aromaticity and the open-/closed shell character of radicals, antiaromatics and non-Kekulé molecules. 

Figure: Reversible Bergman cyclization by atom manipulation: Chemical reaction scheme (top) observed for an individual molecule using an AFM with CO tip functionalization (bottom). All reaction steps are induced by bias voltage pulses with the AFM tip. [4]

References:

[1] L. Gross et al. Science 325, 1110 (2009)

[2] L. Gross et al. Science 337, 1326 (2012)

[3] N. Pavliček et al. Nature Chem. 7, 623 (2015)

[4] B. Schuler et al. Nature Chem. 8, 220 (2016)

[5] N. Pavliček et al. Nature Nano. 12, 308 (2017)

报告人简介：