Crystal and molecular structures of a samarium complex with the 3,5-Di-tert-butyl-1,2-quinone-1-(2-hydroxy-3,5-Di-tert-butylphenyl)imine ligand

X-ray structure analysis of Sm(C₂₈H₄₀NO₂)₃ is performed. The crystals are monoclinic, a = 13.490(2) Å, b = 27.955(5) Å, c = 23.000(6) Å, β = 105.30(2)°, Z = 4, space group P2₁/c, and R = 0.0332 for 9670 reflections. The coordination number of the Sm atom is nine (tricapped trigonal prism with the O atoms in the base and the N atoms at the caps). The approximate symmetry of the complex is D ₃. The mean C-O and C-N bond lengths (1.266 and 1.342 Å, respectively) correspond to the monoanion redox form of the ligands. In distinction to the earlier studied complexes ML ₂ with the same ligands, the six-membered rings in the ligands of this complex are essentially noncoplanar: the dihedral angles between them are 42.8°, 34.0°, and 41.1°.