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Azophenine has previously been identified as a controllable molecular switchwhen deposited on a Cu(110) surface, where it can be in two symmetry-equivalentstates. Each of the two states can be set as well as read by means of ascanning tunneling microscope (STM). We propose a family of molecules based onthe same quinone core, which show similar switching behavior without asupporting metal surface. Such a molecule could be an element in a molecularcircuit or computer. Using the example of a simple hypothetical molecule, weshow that it is possible to create molecules that show the necessaryproperties: two conformations with similar energy but different electricconductivity, and the possibility to switch between those by applying anexternal electric field.

A Quinone Based Single-Molecule Switch as Building Block for Molecular Electronics