Abstract
| - Because of its tetrahedral structure, spirobifluorene is an innovative molecule for molecular mechanics studiesby means of scanning tunneling microscopy. On Cu(100), it was observed only anchored at defects becauseof its mobility at room temperature. To frustrate its diffusion, it was functionalized with phenyl and thiophenegroups. Tetraphenylspirobifluorene is also mobile on Cu(100), whereas tetrathienylspirobifluorene is fixed inthe middle of the terraces. This very different behavior is an original and unexpected result because bothbenzene and thiophene are reported to be weakly bound to Cu(100) with almost the same adsorption energy.
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