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Journal Article

Imaging single-molecule reaction intermediates stabilized by surface dissipation and entropy


Rubio,  Angel
Nano-Bio Spectroscopy Group and ETSF, Universidad del País Vasco, 20018 San Sebastián, Spain;
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science (CFEL), Luruper Chaussee 149, 22761 Hamburg, Germany;

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Riss, A., Paz, A. P., Wickenburg, S., Tsai, H.-Z., Oteyza, D. G. D., Bradley, A. J., et al. (2016). Imaging single-molecule reaction intermediates stabilized by surface dissipation and entropy. Nature Chemistry, 8(7), 678-683. doi:10.1038/nchem.2506.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002A-4C78-4
Chemical transformations at the interface between solid/liquid or solid/gaseous phases of matter lie at the heart of key industrial-scale manufacturing processes. A comprehensive study of the molecular energetics and conformational dynamics that underlie these transformations is often limited to ensemble-averaging analytical techniques. Here we report the detailed investigation of a surface-catalysed cross-coupling and sequential cyclization cascade of 1,2-bis(2-ethynyl phenyl)ethyne on Ag(100). Using non-contact atomic force microscopy, we imaged the single-bond-resolved chemical structure of transient metastable intermediates. Theoretical simulations indicate that the kinetic stabilization of experimentally observable intermediates is determined not only by the potential-energy landscape, but also by selective energy dissipation to the substrate and entropic changes associated with key transformations along the reaction pathway. The microscopic insights gained here pave the way for the rational design and control of complex organic reactions at the surface of heterogeneous catalysts.