Synthesis and structures of dinuclear low-coordinate lithium and zirconium(IV) complexes derived from the diamido ligands 1,3-(CH2N¯C6H3R1 2)2C6H4 (R1 _ Me or Pri)

UNCG Author/Contributor (non-UNCG co-authors, if there are any, appear on document)
Terence "Terry" Nile, Professor (Creator)
The University of North Carolina at Greensboro (UNCG )
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Abstract: 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)C6H3R1 2-2,6]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(??) 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.

Additional Information

J. Chem. Soc., Dalton Trans., 2002, 3980–3984
Language: English
Date: 2002
Compounds, molecular structures, complexes, catalytic activity

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