Organoamido- and aryloxo-lanthanoids. v. preparations of low-coordinate lanthanoid(ii) phenolates, ln (oc6h2but 2-2, 6-x-4)2 thf)n(ln = yb or eu; x = h, me or but; n = 2 or 3) and the x-ray crystal structure of five-coordinate [yb (oc6h2but 2-2, 6-x-4)2 thf)3].thf

Glen B. Deacon, Tiecheng Feng, Peter Mac Kinnon, Russell H. Newnham, Siegbert Nickel, Brian W Skelton, Allan H White

Research output: Contribution to journalArticleResearchpeer-review

57 Citations (Scopus)


Lanthanoid (II) complexes of bulky aryl oxides, Ln (OC6H2But 2-2, 6-X-4)2(Ln = Yb or Eu; X = H, Me or But) have been prepared by one or more of the following methods: (i) reaction of Ln (C6F5)2with the appropriate phenol, (ii) reaction of the lanthanoid metal, Hg(C6F5)2and the phenol, and (iii) reaction of the lanthanoid metal with the corresponding thallium(I) phenolate, in tetrahydrofuran (thf), and they have been isolated as Ln (OC6H2But 2-2, 6-X-4)2thf)3complexes. Crystallization of Yb (OC6H2But 2-2, 6-X-4)2 thf)3(X = H or Me) from toluene yields Yb (OC6H2But 2-2, 6-X-4)2 thf)2. The X-ray crystal structure of [ Yb (OC6H2But 32, 4, 6)2 thf)3]. thf [monoclinic, a 10.20(1), b 32.97(2), c 16.018(4) Â, β 93.52(8)°, V 5375 Â3Z 4, 2734 'observed' data refined to R 0.070] shows distorted square pyramidal five coordination for ytterbium with an apical thf oxygen [ Yb -O 2.44(1)Â], and transoidphenolate oxygens [ Yb -O 2.21(1), 2.22(1)Â, O- Yb -O 149.0(6)°] and transthf oxygens [ Yb -O 2.47(2), 2.48(1)Â, O-Yb -O 177.3(5)°] in the square plane. Four methyl groups (Yb…C 3.89-4.15 Â) across the square plane away from the apical oxygen may block coordination of an additional ligand. X-Ray structures of Yb (OC6H2But 2-2, 6-Me-4)2thf)n showing four coordination (n = 2) and five coordination (n = 3), given in a preliminary communication,1are further discussed.

Original languageEnglish
Pages (from-to)387-399
Number of pages13
JournalAustralian Journal of Chemistry
Issue number3
Publication statusPublished - 1993

Cite this