Université de Fribourg

From alkaline earth ion aggregates via transition metal coordination polymer networks towards heterometallic single source precursors for oxidic materials

Gschwind, Fabienne ; Crochet, Aurélien ; Maudez, William ; Fromm, Katharina M.

In: CHIMIA International Journal for Chemistry, 2010, vol. 64, no. 5, p. 299-320

Heterometallic oxides are used as materials in many applications, e.g. from ferroelectrics to superconductors. Making these compounds usually requires high temperatures and long reaction times. Molecular precursors may contribute to render their processing shorter and accessible at lower temperatures, thus cheaper in energy and time. In this review article, different approaches toward oxide...

Université de Fribourg

The Heterometallic Clusters of Trivalent Rare Earth Metals of [Ln(OPh)₆{Li(dme)}₃], with Ln=Eu and Sm

Maudez, William ; Fromm, Katharina M.

In: Helvetica Chimica Acta, 2009, vol. 92, no. 11, p. 2349-2356

Two new heterobimetallic phenoxide LnIII-Li complexes of formula [Ln(μ₂-OPh)₆{Li(dme)}₃] (Ln=Sm, Eu) have been synthesized and characterized using single-crystal X-ray diffraction. These two compounds are isostructural.

Université de Fribourg

Analogy of the Coordination Chemistry of Alkaline Earth Metal and Lanthanide Ln²⁺ Ions: The Isostructural Zoo of Mixed Metal Cages [IM(OtBu)₄{Li(thf)}₄(OH)] (M=Ca, Sr, Ba, Eu), [MM′₆(OPh)₈(thf)₆] (M=Ca, Sr, Ba, Sm, Eu, M′=Li, Na), and their Derivatives with 1,2-Dimethoxyethane

Maudez, William ; Meuwly, Markus ; Fromm, Katharina M.

In: Chemistry - A European Journal, 2007, vol. 13, no. 29, p. 8302 - 8316

As previously shown, alkali and alkaline earth metal iodides in nonaqueous, aprotic solvents behave like transition metal halides, forming cis- and trans-dihalides with various neutral O-donor ligands. These compounds can be used as precursors for the synthesis of new mixed alkali/alkaline earth metal aggregates. We show here that Ln²⁺ ions form isostructural cluster compounds....