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The Structure of Mn(acac) 3 —Experimental Evidence of a Static Jahn–Teller Effect in the Gas Phase
Author(s) -
Berger Raphael J. F.,
Girichev Georgiy V.,
Giricheva Nina I.,
Petrova Angelika A.,
Tverdova Natalya V.
Publication year - 2017
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201708498
Subject(s) - acetylacetone , octahedron , manganese , tetragonal crystal system , chemistry , crystallography , conformational isomerism , thermal decomposition , planarity testing , gas phase , electron diffraction , crystal structure , inorganic chemistry , diffraction , molecule , organic chemistry , physics , optics
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 C 2 symmetry with the central structural motif of a tetragonal elongated MnO 6 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 (r h1 =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.