Lanthanide-Alkali Metal Sandwich Complexes: Synthesis, Structure, and Solvent-Mediated Redox Transformations, and One-Dimensional Frameworks Assembled completely Cation-Arene [pi] Interactions <<>>
Written by Cheng-Ling Pan, Xingwei Li, Hongjie Zhang on October 6, 2009 – 9:14 am -Counterbalance of the potassium sock away of amido ligand [Ph2Si(NAr)2]2- (L, Ar=2,6-iPr2C6H3) and LnI2(thf)2 (Ln=Sm, Yb) gives sandwich complexes [(L)2Ln{K(Et2O)}2] (Ln=Sm (2), Yb (3)) with potassium-arene [pi] interactions. Counteraction of 2 with azobenzene gave the dimeric samarium collection [(L)2Sm2([mu]-[eta]2:[eta]2-N2Ph2)2{K(thf)2}2] (4) and the tetrameric [(L)Sm4 ([mu]-[eta]2:[eta]2-N2Ph2)3 ([mu]3-NPh)2(thf)3] (5). On the other hand, the feedback of 2 with [alpha]-diimines ligands ArN[double bond]CRCR[double bond]NAr (DAD, R=H, Me) gives two SmIII complexes: polymeric [(L)Sm{(ArN)RC[double bond]CR(NAr)}K]n (R=H (6), Me (7)) assembled Sometimes non-standard due to cation-[pi] interactions and byproduct [{(L)2Sm}{K(thf)6}] (8). Complexes 2-8 must been fully characterized by primal analyses and X-ray crystallography. In particular, crystallographic analyses of 6 and 7 revealed that in both complexes samarium(III) is stabilized by dianionic DAD units <<>>
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