Synthesis, structure, and reactivity of cerium(IV) calix[4]arene complexes

被引：17

作者：

Gottfriedsen, Jochen ^{[1
]}

Hagner, Reimo ^{[1
]}

Spoida, Marlies ^{[1
]}

Suchorski, Yuri ^{[1
]}

机构：

[1] Univ Magdeburg, Chem Inst Otto Von Guericke, D-39106 Magdeburg, Germany

来源：

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY | 2007年 / 16期

关键词：

cerium; calixarenes; photoelectron spectroscopy;

D O I：

10.1002/ejic.200601004

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The equimolar reaction of Ce(hfac)(4) (1) (hfac = 1,1,1,5,5,5-hexafluoropentanedionato) with p-tBu-calix[4](OMe)(2)(OH)(2) in toluene gave the new cerium(IV) calix[4]arene complex (p-tBu-calix[4](OMe)2(0)2)Ce(hfaC)2 (2). The single-crystal X-ray structure shows the cone geometry of the calixarene ligand with the methoxy groups coordinated to the cerium; it shows slightly longer cerium-oxygen (acetylacetonate ligand) bond lengths than the corresponding bonds in the analogous nonfluorinated complex (p-tBu-calix[4](OMe)(2)-(O)(2)}Ce(acac)(2) (3). The bromination reaction of 3 gave the bisbrominated complex {p-tBu-calix[4](OMe)(2)(O)(2)}Ce(Br-acac)(2) (4). H-1 NMR spectroscopic studies and a single-crystal X-ray structure of 4 revealed that the bromination took place in the 3-position of the acac ligand. Furthermore, the first Xray photoelectron spectroscopy (XPS) evaluation of the Ce oxidation state in cerium calix[4]arene complexes 2 and 3 is presented, and X-ray induced changes of Ce x in these complexes are detected. ((c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)

引用

页码：2288 / 2295

页数：8

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