Synthesis and characterisation of magnesium complexes containing sterically demanding N,N′-bis(aryl)amidinate ligands

Moxey, Graeme J., Ortu, Fabrizio, Sidley, Leon Goldney, Strandberg, Helen N., Blake, Alexander J., Lewis, William and Kays, Deborah L. ORCID: https://orcid.org/0000-0002-4616-6001 2014. Synthesis and characterisation of magnesium complexes containing sterically demanding N,N′-bis(aryl)amidinate ligands. Dalton Transactions 43 (12) , pp. 4838-4846. 10.1039/C3DT53234H

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Abstract

Condensation reactions of carboxylic acids and anilines in the presence of polyphosphoric acid trimethylsilyl ester (PPSE) afforded a range of sterically demanding N,N′-bis(aryl)amidines, RN{C(R′)}N(H)R [R = Mes (Mes = 2,4,6-trimethylphenyl), R′ = Cy (Cy = cyclohexyl) L1H; R = Dipp (Dipp = 2,6-diisopropylphenyl), R′ = Cy L2H; R = Mes, R′ = Ph L3H; R = Dipp, R′ = Ph L4H; R = Mes, R′ = Dmp (Dmp = 3,5-dimethylphenyl) L5H; R = Dipp, R′ = Dmp L6H; R = Dmp, R′ = Cy L7H]. Amidines L1H–L7H have been characterised spectroscopically, and for L5H and L6H, by X-ray crystallography. Treatment of the amidines with di-n-butylmagnesium in THF solution afforded the monomeric magnesium bis(amidinates) [Mg(L1)2(THF)] 1, [Mg(L2)2] 2, [Mg(L3)2(THF)] 3, [Mg(L5)2(THF)] 5, [Mg(L6)2] 6, [Mg(L7)2] 7, and the magnesium mono(amidinate) complex [Mg(L4)(nBu)] 4. These complexes have been characterised spectroscopically, with 1–3, 5 and 6 also being structurally authenticated. Comparison of the magnesium bis(amidinate) complexes reveals that the steric bulk of the amidinate ligand influences both the solid state structure and solution behaviour of these complexes.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry
Publisher:	Royal Society of Chemistry
ISSN:	1477-9226
Date of Acceptance:	24 January 2014
Last Modified:	10 Jul 2024 10:16
URI:	https://orca.cardiff.ac.uk/id/eprint/170322

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