Neue Benzylkomplexe der Lanthanoiden. Darstellung und Kristallstrukturen von [(C5Me5)2Y(CH2C6H5)(thf)], [(C5Me5)2Sm(CH2C6H5)2K(thf)2]? und [(C5Me5)Gd(CH2C6H5)2(thf)]

YBr3 reagiert in Gegenwart von K(C5Me5) mit Kaliumbenzyl in THF unter Abspaltung von KBr zu der Monobenzylverbindung [(C5Me5)2Y(CH2C6H5)(thf)] 1. Die entsprechende Umsetzung mit SmBr3 fuhrt in THF zu der polymeren Verbindung [(C5Me5)2Sm(CH2C6H5)2K(thf)2]∞2, mit GdBr3 zu [(C5Me5)Gd(CH2C6H5)2(thf)] 3. Die Strukturen von 1–3 wurden jeweils durch Anfertigen einer Einkristallstrukturanalyse geklart: 1: Raumgruppe P1, Z = 2, a = 851,2(4) pm, b = 952,7(4) pm, c = 1858,6(8) pm, α = 79,90(4)°, β = 77,35(4)°, γ = 73,30(3)°. 2: Raumgruppe P1, Z = 2, a = 903,3(2) pm, b = 1375,9(3) pm, c = 1801,1(4) pm, α = 100,92(3)°, β = 100,77°, γ = 98,25(3)°. 3: Raumgruppe P21/n, Z = 8, a = 1458,2(5) pm, b = 927,8(3) pm, c = 3792,9(15) pm, β = 96,83(3)°. New Benzyl Complexes of the Lanthanides. Synthesis and Crystal Structures of [(C5Me5)2Y(CH2C6H5)(thf)], [(C5Me5)2Sm(CH2C6H5)2K(thf)2]∞, and [(C5Me5)Gd(CH2C6H5)2(thf)] YBr3 reacts with potassium benzyl and [K(C5Me5)] in THF to give KBr and the monobenzyl compound [(C5Me5)2 · Y(CH2C6H5)(thf)] 1. The analogous reaction with SmBr3 in THF leads to the polymeric product [(C5Me5)2Sm(CH2C6H5)2 ∞ K(thf)2]∞2, with GdBr3 to [(C5Me5)Gd(CH2C6H5)2(thf)] 3. The structures of 1–3 were determined by X-ray single crystal structure analysis: Space group P1, Z = 2, a = 851.2(4) pm, b = 952.7(4) pm, c = 1858.6(8) pm, α = 79.90(4)°, β = 77.35(4)°, γ = 73.30(3)°. Space group P1, Z = 2, a = 903.3(2) pm, b = 1375.9(3) pm, c = 1801.1(4) pm, α = 100.92(3)°, β = 100.77°, γ = 98.25(3)°. Space group P21/n, Z = 8, a = 1458.2(5) pm, b = 927.8(3) pm, c = 3792.9(15) pm, β = 96.83(3)°.