Abstract

Single molecule level time-dependent binding of O2 to cobalt(II) octaethylporphyrin [CoOEP] supported on graphite at the solution-solid interface was observed with scanning tunneling microscopy (STM). Using STM movies of the surface and a stochastic kinetic analysis it was possible to extract both the binding and dissociation rate constants for this reversible equilibrium process. This study was the first of its kind and has opened the way for kinetic analysis if reversible surface reactions at the single molecule level by STM methodology. These results are transformative for STM based studies because they demonstrate both the possibility of, and the methodology for, performing kinetic binding studies at the solution solid interface at room temperature.

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