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Evaluation and X-Ray Induced Modification of the Cerium Oxidation State in Cerium Calixarene Complexes

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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.

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Periodical:

Solid State Phenomena (Volume 128)

Pages:

115-120

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.128.115

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Online since:

October 2007

Authors:

Yuri Suchorski, Jochen Gottfriedsen, Rafal Wrobel, Bartosz Strzelczyk, Helmut Weiss

Keywords:

Cerium Calixarene Complexes, Cerium Oxidation State, Photoreduction, X-Ray Photoelectron Spectroscopy (XPS)

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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