STM observation of C60 adducts on HOPG

Molecules that may adopt various stable conformations might be applied to store information. We have investigated arrangement of complex fullerene organometallic cycloadducts deposited on HOPG (Highly Oriented Pyrolitic Graphite) substrate using Scanning Tunneling Microscopy (STM) seeking ehether their structure could be determined. These complexes are easily distinguishable on HOPG by the molecules of high density of states of C60 and the adducted group. Various types of arrangement of the molecules were identified and tunneling spectroscopic measurements were performed at individual molecules. The images and spectroscopic results are interpreted using semiempirical quantum chemistry calculations.