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The Structure of Mn(acac)3 -Experimental Evidence of a Static Jahn-Teller Effect in the Gas Phase
Raphael J F Berger1, Georgiy V Girichev2, Nina I Giricheva3
1Materialchemie, Fachbereich für Chemie und Physik der Materialien, Paris-Lodron Universität Salzburg, Jakob-Haringer-Strasse 2 a, 5020, Salzburg, Austria.
Abstract:
The structure of free manganese(III) tris(acetylacetonate) [Mn(acac)3 ] was determined by mass-spectrometrically controlled gas-phase electron diffraction. The vapor of Mn(acac)3 at 125(5) °C is composed of a single conformer of Mn(acac)3 in C2 symmetry with the central structural motif of a tetragonal elongated MnO6 octahedron and 47(2) mol % of acetylacetone (Hacac) formed by partial thermal decomposition of Mn(acac)3 . Three types of Mn-O separations have been refined (rh1 =2.157(16), 1.946(5), and 1.932(5) Å. We have found no indication for a significant deviation of the -C-C-C-O-Mn-O- six-membered rings from planarity, which is observed in the solid state.
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