Crystal structure of a dimeric β-diketiminate magnesium complex

The solid-state structure of a dimeric beta diketiminate magnesium(II) complex is discussed. The compound, di-mu-iodido-bis[({4-amino-1,5-bis[2,6-bis(propan-2-yl) phenyl] pent-3-en-2-ylidene} azanido-kappa N-2,N') magnesium(II)] toluene sesquisolvate, [Mg-2(C29H41N2)(2)I-2]center dot 1.5C(7)H(8), 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 mu-iodide ligands with very similar Mg-I distances. The two Mg atoms are located slightly below (similar to 0.5 angstrom) the least-squares plane defined by N-C-C-N atoms in the ligand scaffold, and are approximately tetrahedrally coordinated. One and one-half toluene solvent molecules are disordered with respect to mirror-site symmetry at Wyckoff sites 4i and 2a, respectively. In the former case, two toluene molecules interact in an off-center parallel stacking arrangement; the shortest C to C' (pi-pi) distance of 3.72 (1) angstrom angstrom was measured for this interaction.