Synthesis and structure of tetrahydrofuran adduct of tris(indenyl)dysprosium

Reaction of DyCl3 with excessive amount of K and indene in THF forms (C9H7) (3)Dy (THF), which crystallizes in hexagonal system, space group P6(3) with a = b = 11. 719 (5), c = 10. 167 (2) Angstrom, V = 1211 (1) Angstrom(3), M -r = 580. 07, D-c = 1. 590 g/cm(3), Z = 2, F(000) = 578, mu = 31. 31 cm(-1) . Final R = 0. 043 and R-w = 0. 055 for 1273 observed reflections with I>3 sigma(I). The crystal structure shows that in the title compound the indeny l group is bonded to dysprosium in an eta(3)+eta(2)-fashion, and is bent ov er the C(1) and C(3) axis by 12. 7 degrees. Its nodal carbon atoms C(4) and C(9) which are weakly bonded to the metal atom are at distances of: 2. 92( 1) and 2. 94(1) Angstrom, respectively. The average Dy-C(eta(3)) bond dista nce is 2. 66(1) Angstrom.