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The ruthenium carbonyl derivatives of lutecium (THF)Cp2LuRu(CO)2Cp (1), (THF)[1, 3(Me3Si)2C5H3]2LuRu(CO)2Cp, and (C5Me5)2LuRu(CO)2Cp were prepared by treating Na[CpRu(CO)2] with lutecium halides in THF. An X-ray structural investigation of1 was performed (MoKa radiation, 1828 reflections,R = 0.037). The crystals are monoclinic,a = 14.083(2) Å,b = 8.347(2) Å,c = 17.331(2) Å, ß=106.98°,Z= 4, space group P21/n. The Lu-Ru distance is equal to 2.955(2) Å.

The ligand-exchange equilibria in cyclopentadienyl and metal carbonyl complexes of lanthanum have been qualitatively studied by139La NMR spectroscopy: 2X1X2X3La ? X1X22 La + X1X3, La, where X1=X2=Cp, X3=I; X1=X2 = 1, 3-(Me3Si)2C5H3, X3=Cl; X1=Ru(CO)2Cp; X2=Cp, X3=I. Similar equilibria are typical of the coordination chemistry of light lanthanides.

Cp*2Lu(µ-Cl)2 (1) was isolated following the reaction of Cp*Na (Cp* = 1, 3-(Me3Si)2C5H3) with LuCl3 in THF and subsequent treatment with toluene at 80°C. An X-ray structural investigation of1 was performed (MoKa radiation, 2933 reflections,R = 0.020). The crystals are triclinic,a = 10.744(3) Å,b=11.821(2) Å, c=12.966(3) Å, a=71.54(1)°, ß=85.32(2)°, ?=74.83(1)°,Z = 2, space groupP-1. Two Lu atoms withdistorted tetrahedral coordination are linked by two chloride bridges with a mean Lu-Cl distance equal to 2.62 Å.