Abstract
The solid-state structure of a dimeric β-diketiminate magnesium(II) complex is discussed. The compound, di-μ-iodido-bis-[(-{4-amino-1,5-bis-[2,6-bis-(propan-2-yl)phen-yl]pent-3-en-2-yl-idene}aza-nido-κ2N,N')magnesium(II)] toluene sesquisolvate, [Mg2(C29H41N2)2I2]·1.5C7H8, crystallizes as two independent mol-ecules, each with 2/m crystallographic site symmetry, located at Wyckoff sites 2c and 2d. These have symmetry-equivalent magnesium atoms bridged by μ-iodide ligands with very similar Mg-I distances. The two Mg atoms are located slightly below (∼0.5 Å) the least-squares plane defined by N-C-C-N atoms in the ligand scaffold, and are approximately tetra-hedrally coordinated. One and one-half toluene solvent mol-ecules are disordered with respect to mirror-site symmetry at Wyckoff sites 4i and 2a, respectively. In the former case, two toluene mol-ecules inter-act in an off-center parallel stacking arrangement; the shortest C to C' (π-π) distance of 3.72 (1) Å was measured for this inter-action.
Highlights
The solid-state structure of a dimeric -diketiminate magnesium(II) complex is discussed
The compound, di--iodido-bis[({4-amino-1,5-bis[2,6-bis(propan-2yl)phenyl]pent-3-en-2-ylidene}azanido-2N,N0 )magnesium(II)] toluene sesquisolvate, [Mg2(C29H41N2)2I2]1.5C7H8, crystallizes as two independent molecules, each with 2/m crystallographic site symmetry, located at Wyckoff sites 2c and 2d. These have symmetry-equivalent magnesium atoms bridged by -iodide ligands with very similar Mg—I distances
One and one-half toluene solvent molecules are disordered with respect to mirror-site symmetry at Wyckoff sites 4i and 2a, respectively
Summary
The ubiquity of -diketiminate (Nacnac) ancillary ligands likely stems from the analogous acetylacetonato (acac) ligands in coordination chemistry. This nitrogen analogue of acac allows for modular electronic and steric tuning of the ligand framework by altering groups on the N atoms, which engenders marked stability in low-oxidation-state metals as described in the literature, notably by the late Professor. Whereas the chemistry of group 2 metals is largely defined by the +2 oxidation state, a landmark contribition by Cameron Jones and co-workers, describing an MgI complex bearing a Nacnac ligand, and containing a covalent magnesium–magnesium bond [Mg—Mg. This report describes a previously unreported Mg2I2 complex which crystallizes as two independent dimers, suitable for direct comparison of metrical data
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