Synthesis and structure of η6-benzenelanthanoidtris(aluminum tetrachlorides) (Ln = La, Nd, Sm) (original) (raw)

1989, Journal of Organometallic Chemistry

The @-benzene complexes of ianthanoids Ln($-C,H,)(AlCl,),-C,H, (Ln = La (l), Nd (2), Sm (3)) have been prepared by the reaction of LnCl, with activated AlCI, in benzene. The crystal structures of 2 and 3 have been determined. Complexes 2 and 3 each crystallize ftom benzene in the triclinic space group Pi; with a 9.40(2), b 9,74(3), c 16.61(5) A, a 96.69{2), j3 93.54(3), y 111.63(2)* for 2, and a 9.46(2), b 9.77(3), c l&78(4) A, 1~ 96.00(2), fi 93.7692), y 111,66(2)O for 3. The X-ray diffraction study has revealed that the central atom in Ln($-C~H~}(AlCl~)~-type complexes exerts no distinct influence on the molecular structure. Comparable M-ligand bond lengths reflect the difference in the ionic radii of neodymium and samarium.