A New Class of Linked-bis(N,N'-dialkylamidinate) Ligand: Applications in the Synthesis of Bimetallic Aluminium Complexes

Grundy, Joanna, Coles, Martyn P and Hitchcock, Peter B (2002) A New Class of Linked-bis(N,N'-dialkylamidinate) Ligand: Applications in the Synthesis of Bimetallic Aluminium Complexes. Journal of Organometallic Chemistry, 662 (1-2). 178 - 187. ISSN 0022-328X

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Abstract

The 1,4-benzenebis(N,N¿-dialkylamidine) compounds, 1,4-C6H4[C{NR}{NHR}]2 (1, R=Cy; 2, R=iPr) were synthesised via addition of a stoichiometric amount of water to the 1,4-benzenebis(amidinate) species, generated from the in situ reaction between 1,4-Li2C6H4 and the appropriate carbodiimide. Alternatively, the neutral silylated derivatives, 1,4-C6H4[C{NR}{N(SiMe3)R}]2 (3, R=Cy; 4, R=iPr) are synthesised by quenching the 1,4-benzenebis(amidinate) with excess Me3SiCl. Structural characterisation of selected examples are reported, showing that the neutral NH compounds are monomeric with a E-syn:E-syn arrangement of the N-alkyl substituents, while in the silylated derivative 4, the E-anti:E-anti form is present in the solid-state. Synthesis of the bimetallic aluminium compounds 1,4-C6H4[C{NiPr}2AlMeX]2 (5, X=Cl; 6, X=Me) was achieved from AlMe2Cl using 2 by either the direct protonolysis of an Al---C bond (5), or the trans-metallation reaction of the in situ generated dilithio-salt (6). Structural characterisation of 6 revealed a monomeric complex with a perpendicular arrangement of the amidinate units with respect to the C6-group.

Item Type: Article
Schools and Departments: School of Life Sciences > Chemistry
Depositing User: Martyn Coles
Date Deposited: 06 Feb 2012 20:26
Last Modified: 27 Mar 2012 11:52
URI: http://sro.sussex.ac.uk/id/eprint/25937
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