Erbium alkoxides

Mi Ae Lim, Sang 11 Seok, Taimur Athar, Jung-Jin Ju, Myung-Hyun Lee and Seok In Hong, Photoluminescence characteristics of sol-gel materials prepared from bimetalhc erbium alkoxides coordinated by A1 or Ti, J. Amer. Ceram. Soc., vol. 90, no. 1, pp. 116-119,2007. 

Simple methoxides like La(OMe)3 are ill-defined structurally but are oligomeric. Reaction of erbium chips with isopropanol as described affords principally the oxo-centred cluster Er50(0Pr )i3 (with a square-pyramidal core) but there is evidence that gentle work-up gives an alkoxide Ln(OPr )3 without an oxogroup. ... 

Tetrakis(hexafluoroisopropoxides) of titanium, zirconium, and hafnium have been prepared by the reaction of sodium hexafluoroisopropoxide in an excess of hexafluoroisopropyl alcohol with the anhydrous metal chloride, and the spectroscopic properties are reported. The authors note that, in their experience, application to the Group IV transition metals of the previously published method for metal hexafluoroisopropoxide synthesis gives poor yields of material containing metal, fluorinated alkoxides, and co-ordinated ammonia. Dehydration of the hydrated metal chloride with methyl orthoformate and addition of hexafluoroisopropyl alcohol, followed by passage of dry ammonia through the solution, gives satisfactory yields for yttrium, lanthanum, neodymium, and erbium. 

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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