Model of adsorption sites. (a) Adsorption sites of [MnIII
CrIII]3+ on HOPG. (b) [MnIII
CrIII]3+ adsorbs on HOPG with its methyl groups fitting exactly the shown sites forming an equilateral triangle. (c) Model of the lattice of [MnIII
CrIII]3+ on HOPG matching our data with respect to the angle and periods. The circles illustrate the molecule's size measured in crystal .