Fast Molecular Compression by a Hyperthermal Collision Gives Bond-Selective Mechanochemistry

Using electrospray ion beam deposition, we collide the complex molecule Reichardt's dye (C41H30NO+) at low, hyperthermal translational energy (2-50 eV) with a Cu(100) surface and image the outcome at single-molecule level by scanning tunneling microscopy. We observe bond-selective reaction induced by the translational kinetic energy. The collision impulse compresses the molecule and bends specific bonds, prompting them to react selectively. This dynamics drives the system to seek thermally inaccessible reactive pathways, since the compression timescale (subpicosecond) is much shorter than the thermalization timescale (nanosecond), thereby yielding reaction products that are unobtainable thermally.

Automated summary

Through electrospray ion beam deposition and scanning tunneling microscopy, researchers observed bond-selective reactions between complex molecules and metal surfaces at low, hyperthermal translational energy levels. The collision impulse compresses the molecules and bends specific bonds, driving the system to seek thermally inaccessible reactive pathways, resulting in reaction products that are unobtainable thermally due to the fast compression timescale compared to the thermalization timescale.