1. Syntheses and X-ray structures of cerium amide complexes
- Author
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James D. Korp, David M. Hoffman, Jean-Sébastien M. Lehn, and Sherrika D. Daniel
- Subjects
Trigonal planar molecular geometry ,Ligand ,Dimer ,Inorganic chemistry ,chemistry.chemical_element ,Medicinal chemistry ,law.invention ,Inorganic Chemistry ,chemistry.chemical_compound ,Cerium ,chemistry ,law ,Amide ,Alkoxide ,Materials Chemistry ,Physical and Theoretical Chemistry ,Crystallization ,Homoleptic - Abstract
Reaction of CeCl3 with an excess of LiTMP (TMP-H = 2,2,6,6-tetramethylpiperidine) gave [Ce(μ-OCH CH2)(TMP)2]2. The alkoxide ligand originated from THF, which was used as the solvent in the reaction. CeCl3 reacted with 3 equiv. of LiTMP in THF to produce, after crystallization, a 3:2 crystalline mixture of Ce(TMP)3 and [Ce(μ-OCH CH2)(TMP)2]2. Ce(TMP)3 could not be isolated cleanly or separated from the mixture except by handpicking the crystals under a microscope. The homoleptic amide complex Ce[N-t-Bu(SiMe3)]3 was obtained by reacting CeCl3(THF)2 with 3 equivalents of LiN-t-Bu(SiMe3). In the solid state, [Ce(μ-OCH CH2)(TMP)2]2 is a dimer with a Ce(μ-OR)2Ce four-member ring, while Ce(TMP)3 and Ce[N-t-Bu(SiMe3)]3 are trigonal planar monomers. There is structural evidence to suggest the presence of a Ce–vinyl group interaction in [Ce(μ-OCH CH2)(TMP)2]2.
- Published
- 2006
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