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

W Clegg, L Horsburgh, Robert Mulvey, M J Ross, R B Rowlings, V Wilson

Research output: Contribution to journalArticle

12 Citations (Scopus)

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.

LanguageEnglish
Pages1923-1930
Number of pages8
JournalPolyhedron
Volume17
Issue number11-12
DOIs
Publication statusPublished - 1998

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Hempa
Diamide
Diamines
diamines
Magnesium
magnesium
solid state
synthesis
Amides
Crystal structure
Ligands
amides
reagents
Molecules
Geometry
ligands
crystal structure
rings
geometry
molecules

Keywords

  • chelates
  • crystal structure
  • diamides
  • magnesium
  • crystal structures
  • amides
  • lithium
  • zinc
  • reagents
  • metals

Cite this

Clegg, W ; Horsburgh, L ; Mulvey, Robert ; Ross, M J ; Rowlings, R B ; Wilson, V . / Synthesis and solid-state structures of three magnesium diamide complexes derived from RN(H)CH2CH2N(H)R diamine precursors (R = Ph or PHCH2). In: Polyhedron. 1998 ; Vol. 17, No. 11-12. pp. 1923-1930.
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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.",
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author = "W Clegg and L Horsburgh and Robert Mulvey and Ross, {M J} and Rowlings, {R B} and V Wilson",
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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 ; Horsburgh, L ; Mulvey, Robert; Ross, M J ; Rowlings, R B ; Wilson, V .

In: Polyhedron, Vol. 17, No. 11-12, 1998, p. 1923-1930.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Synthesis and solid-state structures of three magnesium diamide complexes derived from RN(H)CH2CH2N(H)R diamine precursors (R = Ph or PHCH2)

AU - Clegg, W

AU - Horsburgh, L

AU - Mulvey, Robert

AU - Ross, M J

AU - Rowlings, R B

AU - Wilson, V

PY - 1998

Y1 - 1998

N2 - 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.

AB - 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.

KW - chelates

KW - crystal structure

KW - diamides

KW - magnesium

KW - crystal structures

KW - amides

KW - lithium

KW - zinc

KW - reagents

KW - metals

U2 - 10.1016/S0277-5387(97)00513-5

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T2 - Polyhedron

JF - Polyhedron

SN - 0277-5387

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ER -