209625-68-3Relevant academic research and scientific papers
Synthesis and crystal structure of π-aromatic chloroaluminate complexes of Samarium(II) (η6-Arene)Sm(AlCl4)2 · nC6H6 and Na[(η6-Arene)Sm(AlCl4)3] · C6H6 (Arene = C6H6 or C6H3Me3)
Troyanov
, p. 359 - 366 (2008/10/08)
Samarium(II) π-aromatic chloroaluminate complexes (η6-C6H6)Sm(AlCl4)2 · 0.5C6H6 (I), (η6-C6H3Me3)Sm(AlCl 4)2 (II), Na[(η6-C6H6)Sm(AlCl4) 3] · C6H6 (III), and Na[(η6-C6H3Me3)Sm(AlCl 4)3] · C6H6 (IV) were prepared by reducing SmCl3 with sodium amalgam (I-IV), metallic aluminum (II), or samarium (II) in the presence of AlCl3 and an aromatic ligand. Single-crystal X-ray diffraction analysis showed that the Sm atom in complexes I-IV has a pentagonal-bipyramidal environment comprised of the π-aromatic ligand and six Cl atoms. The structures of I and II are polymeric: the neighboring complexes are joined by the bridging Cl atoms (Sm-Cl-Al) to form infinite layers (I) or chains (II). Structures III and IV contain the [(η6-C6H6)Sm(AlCl4) 3]- anions and the Na+ cations weakly bound to them. The average distances are the following: Sm-Cl 3.02 A, Sm-C 3.03 A, and Na...Cl (III and IV) 2.89 A. The structures of the Sm(II) complexes are compared with those of the Yb(II) and Ln(III) π-aromatic complexes.
