Structure and Chemistry of Chemisorbed PF3, PF2, and PF on Ni(111): An ESDIAD (Electron Stimulated Desorption Ion Angular Distribution)

摘要

The chemisorption of Phosphorus trifluoride on Nickel (111) was studied with the electron stimulated desorption ion angular distribution (ESDIAD) technique, temperature programmed desorption (TPD), Auger electron spectroscopy (AES), and low energy electron diffraction (LEED). PF3 is shown to bond to atop Ni sites, with PF bonds azimuthally oriented over neighboring Ni atoms. There are two such orientations on the Ni(111) surface that contribute to the observed six beam F(+) (ads). The PF2 and PF species produce a F(+) ESDIAD pattern which indicates that PF2 is bound to 2-fold bridge sites, and PF is bound so that P-F bond is normal to the surface. The chemisorption bonding of PF3 and PF2 to Ni(111) is in accordance with known modes of coordination of these ligands in transition-metal complexes.