Abstract
The title compound, [Mn(C16H17N2O3)2(C2H6OS)2]ClO4·0.774CH3OH, comprises a central octa-hedrally coordinated MnIII cation, with two bidentate Schiff base ligands occupying the equatorial positions and two dimethyl sulfoxide (DMSO) ligands occupying the axial positions. There are two independant cations in the asymmetric unit, with the MnIII atoms of both cations being positioned on crystallographic centers of inversion. The perchlorate anion is disordered over two equivalent conformations, with occupancies of 0.744 (3) and 0.226 (3). In addition, there is a methanol solvent mol-ecule in the crystal lattice that is too close to the minor component of the perchlorate anion to be present simultaneously and thus it was refined to have the same occupancy as the major component of this anion. There is a Jahn-Teller distortion which results in Mn-ODMSO axial bond lengths of 2.2365 (12) and 2.2368 (12) Å in the two cations. In the crystal, inter-molecular π-π stacking between the non-coordinating pyridine rings of each cation is observed. This π-π stacking, along with extensive O-H⋯O hydrogen bonding and C-H⋯O inter-actions, link the components into a complex three-dimensional array.
Highlights
Schiff base ligands occupying the equatorial positions and two dimethyl sulfoxide (DMSO) ligands occupying the axial positions
The perchlorate anion is disordered over two equivalent conformations, with occupancies of 0.744 (3) and 0.226 (3)
There is a methanol solvent molecule in the crystal lattice that is too close to the minor component of the perchlorate anion to be present simultaneously and it was refined to have the same occupancy as the major component of this anion
Summary
Single-molecule magnets (SMMs) are a class of coordination compounds that attract a great deal of scientific attention because they exhibit magnetic bistability at low temperatures (Christou et al, 2000; Gatteschi et al, 2006). These finite size (zero-dimensional) molecules possess a high-spin ground state. Since the discovery of the SMM behavior of Mn12, a lot of synthetic effort has been devoted to the preparation of new molecules with an increased anisotropy barrier. In a continuation of our studies in manganese chemistry with Schiff base ligands as precursors to SSMs (Egekenze et al, 2017a,b,c), we report the structure of bis(3,5-dimethoxy-2-{[2-(pyridin-2-yl)ethylimino-N]methyl}phenolato-O)bis(dimethyl sulfoxide)manganese(III) perchlorate methanol 0.774-solvate
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