Synthesis and characterization of volatile cerium(IV) hexafluoroisopropoxide complexes. Structure of [Hpmdien]2[Ce{OCH(CF3)2}6]

Autor:	Valérie Abada, Jacqueline Vaissermann, Liliane G. Hubert-Pfalzgraf
Rok vydání:	1998
Předmět:	chemistry.chemical_classification Inorganic chemistry chemistry.chemical_element Salt (chemistry) Diglyme Alcohol General Chemistry Fluorine-19 NMR Medicinal chemistry Metal chemistry.chemical_compound Cerium chemistry visual_art visual_art.visual_art_medium Lewis acids and bases
Zdroj:	Journal of the Chemical Society, Dalton Transactions. :3437-3442
ISSN:	1364-5447 0300-9246
DOI:	10.1039/a805338c
Popis:	The reaction between the cerium isopropoxide [Ce2(OPri)8(PriOH)2] and hexafluoroisopropyl alcohol (Hhfip) in THF at room temperature resulted in the formation of [Ce(hfip)4(THF)2(PriOH)x]. More stable compounds namely [Ce(hfip)4(diglyme)], [Ce(hfip)4(bipy)2] and [Ce(hfip)4(tmen)] were obtained if the alcoholysis was achieved in the presence of a Lewis base (diglyme = 2,5,8-trioxanonane, bipy = 2,2′-bipyridine, tmen = N,N,N′,N′-tetramethylethane-1,2-diamine). The use of N,N,N′,N″,N″-pentamethyldiethylenetriamine (pmdien) afforded [Hpmdien]2[Ce(hfip)6] and [Ce(hfip)3(OPri)(pmdien)]. All compounds were volatile and characterized by elemental analyses, FT-IR, 1H and 19F NMR. The pmdien salt was also characterized by X-ray diffraction. The cerium atom is six-co-ordinated [Ce–O 2.183(5)–2.208(5) A] with the CF3 groups forming nearly a crown (Ce· · ·F 4.06–4.32 A). The metallic anion [Ce(hfip)6]2– and the [Hpmdien]+ cations are associated by a short F· · ·C contact (3.15 A). The interactions are retained in solution as evidenced by 1H and 19F NMR.
Databáze:	OpenAIRE
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