2007•Diffusion and defect data, solid state data. Part B, Solid state phenomena/Solid state phenomenaRequires access
Evaluation and X-Ray Induced Modification of the Cerium Oxidation State in Cerium Calixarene Complexes
Yuri Suchorski, J. Gottfriedsen, Rafał J. Wróbel, Bartosz Strzelczyk, Helmut Weiss
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Abstract
The cerium oxidation state in novel calixarene-supported cerium(IV) β-diketonate complexes [p-tBu-calix[4](OMe)2(O)2]Ce(acac)2 (1) and [p-tBu-calix[4](OMe)2(O)2]Ce(hfac)2 (2), which are a new class of potential precursors for homogeneous oxidative transformations, has been determined using X-ray photoelectron spectroscopy (XPS). Cerium oxidation states between 3.6 and 3.65 were detected, distinctly different from their nominal value of +4. An X-ray induced photoreduction of these compounds was detected. Because of the observed stability of the X-ray modified oxidation state under ambient conditions this effect might be used for a long-standing fine tuning of the Ce oxidation state in cerium calixarenes.