500876-64-2Relevant academic research and scientific papers
Synthesis and structures of dinuclear low-coordinate lithium and zirconium(IV) complexes derived from the diamido ligands 1,3-(CH2NC6H3R1 2)2C6H4(R1 = Me or Pri)
Daniele, Stephane,Hitchcock, Peter B.,Lappert, Michael F.,Nile, Terence A.,Zdanski, Colette M.
, p. 3980 - 3984 (2007/10/03)
Treatment of 1,3-bis(bromomethyl)benzene with two equivalents of the appropriate compound Li[N(H)C6H3R12-2,6] yielded the diamines 1,3-[CH2N(H)C6H3R12- 2,6]2C6H4 1 [R1 = Me, abbreviated as H2(D)] or 2 [R = Pri, Abbreviated as H2(D′)]. The crystalline complex [Li2(D′)]2 3 was obtained from 2 and 2 LiBun; the analogue from 1 and 2 LiBun was an incompletely characterised oil. The binuclear, crystalline zirconium(IV) amides [{Zr(NMe2)3}2(μ-D′)]4, its D analogue 5 and [{Zr(NMe2)2}2(μ-D)2]6 were prepared from [{Zr(NMe2)3(μ-NMe2)}2] and H2(D′) [or 2 H2(D′)], H2(D) and 2 H2(D), respectively. The single crystal X-ray molecular structures of complexes 3 and 4 have been elucidated. That of 3 comprises a sixteen-membered, twisted macrocyclic LiNC5NLiNC5N core with each of the two-coordinate lithium atoms part of the LiNLiN rhombus. The four-coordinate zirconium atoms in 4 are in an only slightly distorted tetrahedral environment, with the two Zr(NMe2)3 units arranged trans to one another across the central aromatic ring. None of 4-6, with MAO, showed catalytic activity for ethylene polymerisation under ambient conditions.
