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Does Symmetry Influence the Properties of [Mn III 6 Cr III ] 3+ Single‐Molecule Magnets?
Author(s) -
Hoeke Veronika,
Stammler Anja,
Bögge Hartmut,
Glaser Thorsten
Publication year - 2018
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201800309
Subject(s) - antiferromagnetism , manganese , crystallography , chemistry , ferromagnetism , spectroscopy , nuclear magnetic resonance , analytical chemistry (journal) , physics , condensed matter physics , organic chemistry , chromatography , quantum mechanics
The triplesalen complex [Mn III 6 Cr III ] (ClO 4 ) 3 was synthesized and characterized by single‐crystal X‐ray diffraction, UV/Vis/NIR spectroscopy, and DC and AC magnetic susceptibilities. The molecular structure is D 3 symmetric, whereas all other salts and solvates of [Mn III 6 Cr III ] 3+ are S 6 symmetric. The UV/Vis/NIR spectrum of D 3 symmetric [Mn III 6 Cr III ] 3+ is almost identical to that of S 6 symmetric [Mn III 6 Cr III ] 3+ demonstrating that the electronic structure is not significantly perturbed by the symmetry variation. The magnetic data of D 3 symmetric [Mn III 6 Cr III ] 3+ is also similar to those of S 6 symmetric [Mn III 6 Cr III ] 3+ with antiferromagnetic J Mn–Mn exchange coupling. This is in contrast to the ferromagnetic J Mn–Mn exchange coupling in the chiral RR [Mn III 6 Cr III ] 3+ synthesized with a chiral triplesalen derivative. Due to the chirality, RR [Mn III 6 Cr III ] 3+ is also of D 3 symmetry. However, its UV/Vis/NIR spectrum differs to those of D 3 and S 6 symmetric [Mn III 6 Cr III ] 3+ . This indicates that the electronic and magnetic properties of RR [Mn III 6 Cr III ] 3+ are not different to those of [Mn III 6 Cr III ] 3+ due to the symmetry variation but due to the specific properties of the two triplesalen ligands.