Surface science studies: I. Quinones on metals. II. 2,4-pentanedione on gamma-aluminum oxide/nickel aluminide (100)

A UHV investigation of BQ with polycrystalline iron was performed. The identification of coupling products on iron was monitored after decomposition of the monolayer. The parent BQ decomposes from 200--300 K into bound CO and C2H2 products. The C2H 2 products are coupling to form benzene and 1,3-butadiene at 540 K. The CO is bound in the "deep hollow" sites of the surface. By blocking these reactive sites a separate coupling reaction can be monitored. This reaction is quenched if the surface is pre-exposed to 12 L of O 2.; The results of the surface interaction of Hacac with NiAl (100) and gamma-Al 2O3/NiAl (100) are reported herein. The enol form of Hacac undergoes an acid/base complex reaction with the surface at available aluminum sites. The deprotonation of the Hacac is evident by RAIRS, and the presence of an Al-H stretch on the clean surface. Studies of Hacac on ∼4 A gamma-Al 2O3/NiAl (100) show this same acid/base complex reaction with the surface, but more importantly aluminum is etched at 170 and 750 K. The evidence for etchant products below the decomposition temperature indicates that this would be a suitable etchant for alumina.; Surface science studies of AQM14a were performed in order to identify the mechanism for corrosion inhibition in polymers containing amine quinones. These studies focus on both the shift in the CO stretching mode, and the shift in binding energy of the oxygen AQM14a after deposited onto a metal surface compared to that of the bulk species. The shift of 2 eV up in binding energy, as well as the 100 cm-1 shift up in the CO stretching mode indicate that there is a strong electron donation from the oxygen in AQM14a into the surface. The studies also show a much weaker interaction with copper. Only a 1 eV shift up in binding energy for the oxygen could be measured by XPS on copper.