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Synthesis and solid-state structures of three magnesium diamide complexes derived from RN(H)CH2CH2N(H)R diamine precursors (R = Ph or PHCH2)

Clegg, W and Horsburgh, L and Mulvey, Robert and Ross, M J and Rowlings, R B and Wilson, V (1998) Synthesis and solid-state structures of three magnesium diamide complexes derived from RN(H)CH2CH2N(H)R diamine precursors (R = Ph or PHCH2). Polyhedron, 17 (11-12). pp. 1923-1930. ISSN 0277-5387

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Abstract

Three new magnesium diamide complexes have been prepared by treating the diamine precursors N,N'-diphenylethylenediamine or N,N'-dibenzylethylenediamine with the commercial reagent dibutyl-magnesium in the presence of a donor solvent (THF or HMPA). Their crystal structures have been determined. Both [{MgN(Ph)CH2CH2N(Ph). 2THF(1.5 THF)}(2)] and [{MgN(CH2Ph)CH2CH2N(CH2Ph). HMPA}(2)] adopt dimeric arrangements based on trans-5.4.5-fused ring systems. The former structure is distinctive and noteworthy for exhibiting a five-coordinate, distorted trigonal bipyramidal Mg centre, instead of the more usual four-coordinate, distorted tetrahedral geometry found in the latter structure. Replacing the two THF ligands of the former structure by two HMPA molecules leads to deaggregation, in the form of the monomeric complex [MgN(Ph)CH2CH2N(Ph). 2HMPA], which also displays an unremarkable distorted tetrahedral Mg coordination. Comparisons are made with other dimeric and monomeric, magnesium-amide and related complexes. (C) 1998 Elsevier Science Ltd. All rights reserved.

Item type: Article
ID code: 38199
Keywords: chelates, crystal structure, diamides, magnesium, crystal structures, amides, lithium, zinc, reagents, metals, Chemistry, Materials Chemistry, Physical and Theoretical Chemistry, Inorganic Chemistry
Subjects: Science > Chemistry
Department: Faculty of Humanities and Social Sciences (HaSS) > School of Education > Education
Faculty of Science > Pure and Applied Chemistry
Related URLs:
    Depositing user: Pure Administrator
    Date Deposited: 06 Mar 2012 12:54
    Last modified: 05 Sep 2014 15:24
    URI: http://strathprints.strath.ac.uk/id/eprint/38199

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