226717-58-4Relevant articles and documents
Crystalline di- or trianionic metal (Al, Sm) β-diketiminates
Coles, Martyn P.,Hitchcock, Peter B.,Khvostov, Alexei V.,Lappert, Michael F.,Protchenko, Andrey V.
, p. 6426 - 6433 (2010/09/06)
The new [Al(LTol)Br2] (1) and the known [Al(L Ph)Me2] (2) were prepared as potential precursors to more novel aluminium compounds. In the event, only the latter was effective. Thus 2 and two equivalents of potassium was the source of [{Al(LPh)Me 2K2(OEt2)}2] (3). The complexes [{KSm(LPh)2}2] (4), [Sm2(L Dph)3] (5) and [Sm(LTol,Ad)(L Tol,Ad-H)] (6) were obtained from SmI2 and two equivalents of the appropriate potassium β-diketiminate [LPh or L Tol or LDph = {N(SiMe3)C(Ar)}2CH, Ar = Ph or C6H4Me-4 or C6H4Ph-4; LTol,Ad = N(SiMe3)C(C6H4Me-4)C(H) C(Ad)NSiMe3, LTol,Ad-H = N(SiMe3)C(C 6H4Me-4)C(H)C(Ad)NSiMe2CH2, Ad = 1-adamantyl]. Crystalline complexes 3-6 were isolated in very low (4, 5) or satisfactory (3, 6) yield and characterised by X-ray diffraction. From comparisons of the M-N, N-C, C-C and C-CAr bond lengths with suitable standards, complexes 3-5 are assigned as containing Al3+/(L Ph)3- for 3, Sm3+/(LPh) -/(LPh)3- for 4, and {Sm3+} 2/(LDph)-/(LDph)2-/ (LDph)3- for 5. Complex 6 is best formulated as a Sm 3+ compound with one "normal" (LTol,Ad) - and one deprotonated (LTol,Ad-H)2- ligand. The Royal Society of Chemistry.
