New class of substances for redox reactions
The step-wise oxidation of a new redox-active molecular semiconductor is recognized by changing shape, assembly behavior and other properties by spectro-microscopy correlation.
Using X-ray photoelectron spectroscopy and scanning tunneling microscopy the oxidation of a set of Pyrazenacenes a newly synthesized redox active class of molecular semiconductors, has been investigated. The molecules comprise a very interesting case of multi-stage redox chemistry and photochemistry that has been investigated in solution and on surfaces. In addition to the oxidation state the molecular structure and conformation change with the redox reaction leading to specifically different self-assembled arrangement. In the native reduced form (obtained directly after synthesis), the molecules are isolated and immobile when deposited on a surface, while they mobilize to form chains after a first oxidation step. A second oxidation step changes the geometry of the molecule and they are again isolated and immobile.
Further information available
D. Miklik et al. Communication Chemistry 4, 29 (2021) https://doi.org/10.1038/s42004-021-00470-w