Erbium isopropoxides

Westin, G, Kritikos, M., and Wijk, M. (1998) Synthesis and properties of erbium isopropoxides structural characterization of Er5(0)(0IV)i3. Journal of Solid State Chemistry, 1411, 168-176. 

The currently determined X-ray structure of a tetranuclear heterobimetallic isopropoxide, ErAI3(0-/-Pr),2 (Fig. 25) (251), possesses a noncrystallographi-cally imposed C3 point symmetry, with the rotation axis perpendicular to the plane through the aluminum atoms. The coordination geometry around the erbium atom is a distorted trigonal prism, in contrast to the ideal octahedral coordination for the central aluminum atom in the structure of A1A13(0-/-Pr),2 (see Fig. 2). 

On the basis of mass spectral data, Mazdiyasni et al. reported tetrameric natnre for neodymium, erbium, and lutetium isopropoxides. The tetrameric structure of [Ln(OCH2Bu )3]4 (Ln = La, Nd) has recently been confirmed by X-ray crystallography," whereas the t-butoxide is trinuclear [La3(OBu )9(Bu OH)2]." ... 

The reactions of gadolinium, erbium, yttrium, and ytterbium isopropoxides with acids or acid anhydrides mono-, di-, and tri-carboxylates depending upon... 

The cubane structure [M4(m3-OR)4] (Fig. 4.6) is favoured by the alkali metal tertiary butoxides (M = K, Rb, Cs) and thallium(i) alkoxides, and also related species such as [Me4Zn4(/ t-OMe)4]. Another common tetranuclear structure [M4(jti-OR)6(OR)6] (Fig. 4.7) involves one central octahedral metal bridged to three tetrahedral metals in a chiral configuration (D3). Crystalline aluminium isopropoxide was the first example established to have this structural type. ° Interestingly in the heterometallic complex [ErAl3(OPr )i2] the central position is occupied by the erbium ion in a distorted trigonal prismatic configuration. ... 

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