Abstract
Thin films of the rare earth tris(8-hydroxyquinolines) YbQ 3 and ErQ 3 were evaporated in ultra-high vacuum, and studied by X-ray photoelectron spectroscopy (XPS). Evaporation was monitored by mass spectroscopy of the major cracking products, which have masses >200 a.m.u. and show further splitting due to wide isotope distributions. C and N 1s XPS data are very similar to those of aluminium tris(8-hydroxyquinolines), implying very similar ligand behaviour, while the O 1s binding energy was significantly higher, indicating a more ionic metal–oxygen bond. YbQ 3 was found to be completely trivalent, with no indication of the mixed valence behaviour observed in other Yb compounds.
Published Version
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