| Popis: |
The binuclear ytterbium complex Ph 2 Yb(THF)(μ-Ph) 3 Yb(THF) 3 ( 1 ) was obtained in reactions of naphthaleneytterbium C 10 H 8 Yb(THF) 2 with diphenylmercury or triphenylbismuth in THF. An X-ray crystallographic study ( a = 11.099(2), b = 19.876(4), c = 19.723(4) A, β = 103.33(3)°, Z = 2, space group P 2 1 ) showed that the molecule of 1 has two Yb atoms coupled by three bridging Ph groups, which are linked with the first Yb atom by an η 1 bond and with the second one by an unsymmetrical η 2 bond. In addition the first Yb atom has an η 1 bond with two terminal Ph groups and one coordinated THF molecule whereas the second Yb atom is linked with three THF molecules. The coordination of both Yb atoms is a distorted octahedron. In the crystal, there are two symmetrically independent molecules of 1 with a similar structure. The YbC (terminal Ph) bond length is 2.388–2.463 A. The η 1 - and η 2 -YbC (bridging Ph) bond distance varies in the ranges 2.475–2.584, 2.547–2.751 and 2.877–3.250 A. The magnetic moment μ eff (per Yb III atom) is 4.0±0.05 μ B . Reactions of 1 with water, HCl, Br 2 , MeI and CO 2 give benzene, bromobenzene, toluene and PhCOOH, respectively. |
