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Synthetic and structural investigations of alkali metal diamine bis(phenolate) complexes

Clegg, W. and Davidson, M.G. and Graham, D.V. and Griffen, G. and Jones, M.D. and Kennedy, A.R. and O'Hara, C.T. and Russo, L. (2008) Synthetic and structural investigations of alkali metal diamine bis(phenolate) complexes. Dalton Transactions (10). pp. 1295-1301. ISSN 1472-7773

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Abstract

Two lithium and one sodium diamine bis(phenolate) complexes have been prepared and characterised by X-ray crystallography and NMR spectroscopy. Two parent diamine bis(phenol) ligands were utilised in the study (1-H2 and 2-H2). Dimeric (1-Li2)2 was prepared by treating 1-H2 with two molar equivalents of n-butyllithium in hydrocarbon solvent. It adopts a ladder-like structure in the solid state, which appears to deaggregate in C6D6 solution. The monomeric (hence, dinuclear) TMEDA-solvated species [2-Li2·(TMEDA)] has two chemically unique Li atoms in the solid state and is prepared by reacting 2-H2 with two molar equivalents of n-butyllithium in hydrocarbon solvent, in the presence of N,N,N′,N′-tetramethylethylenediamine (TMEDA). Finally, the dimeric sodium-based [2-Na2·(OEt2)]2 was prepared by reacting 2-H2 with two molar equivalents of freshly prepared n-butylsodium in a hydrocarbon-diethyl ether medium. The complex adopts a Na4O4 cuboidal structure in the solid state, which appears to remain intact in C6D6 solution. (Abstract from: http://www.swetswise.com/eAccess/viewAbstract.do?articleID=35973844)