摘要:
Samarium diiodide reacts with potassium indenide and potassium fluorenide to form new THF-soluble samarium(II) reagents, the bis(indenyl) complex (C9H7)2Sm(THF) (1) and the bis(fluorenyl) complex (C13H9)2Sm(THF)2 (2). Crystallographic data for 2 and the trisolvated derivative of 1, namely (C9H7)2Sm(THF)3 (1a), show that they have monometallic bent-metallocene structures analogous to the pentamethylcyclopentadienyl derivative (C5Me5)2Sm(THF)2 (3). 1a crystallizes from THF in space group C2/c with a = 15.013(7) angstrom, b = 10.677(4) angstrom, c = 19.132(17) angstrom, beta = 93.87(6)degrees, V = 3059(3) angstrom3, and Z = 4 for D(calcd) = 1.34 Mg/m3. 2 crystallizes from toluene/THF in space group P2(1)/n (C5(2h); No. 14) with a = 11.810(2) angstrom, b = 14.153(3) angstrom, c = 16.001(4) angstrom, beta = 97.60(2)degrees, V = 2651.1(9) angstrom3, and Z = 4 for D(calcd) = 1.566 Mg/m3. Least-squares refinement of the model based on 2953 reflections (\F(o)\ > 2.0sigma(\F(o\)) converged to a final R(F) = 4.8%. The structural data indicate that the bis(indenyl) and bis(fluorenyl) ligand sets provide a more open Sm(II) reaction environment than in 3.