Lithium aryloxo magnesiates

An examination of ligand size and donor effects

Maria Felisa Zuniga, Johannes Kreutzer, Weijie Teng, Karin Ruhlandt

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The combination of equimolar amounts of LiOAr and Mg(OAr)2 (OAr = aryloxide) in polar media afforded several lithium aryloxomagnesiates. Factors influencing the structural chemistry of the compounds, such as the degree of ligand bulk, type of Lewis base donors, and crystallization solvent, are examined. Structural characterization reveals a discrete, solvent-separated species, [Li(thf)4][Mg(BHT)3]·THF (1) (BHT = 2,6-tBu2-4-MeC6H2O) and a family of molecular compounds with various Li/Mg stoichimetries, including a 1:1 Li/Mg ratio in [LiMg(Odpp)3(thf)2]·0.5PhMe (2) (Odpp = 2,6-Ph 2C6H3O) and [Li(Et2O)Mg(Odpp) 3]·0.5PhMe (3), a 2:1 Li/Mg ratio as in [{Li(thf) 2}2Mg(OMes)4]·2THF (4) (OMes = 2,4,6-Me3C6H2O) and [{Li(tmeda)} 2Mg(m-Odtp)4]·0.5Et2O (5) (m-Odtp = 3,5-tBu2C6H3O), and a novel 2:3 Li/Mg ratio in [{Li(thf)2}2Mg3(m-Odtp)8(thf) 2]·3THF (6). Two new homometallic magnesium bis(aryloxides), Mg(Odpp)2(thf)2 (7) and Mg(Odpp)2(Et 2O)2 (8), are also included for the sake of comparison. The solution behavior of the heterobimetallic compounds in arene and polar solvent is analyzed by 1H NMR spectroscopy.

Original languageEnglish (US)
Pages (from-to)10400-10409
Number of pages10
JournalInorganic Chemistry
Volume46
Issue number24
DOIs
StatePublished - Nov 26 2007

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Lithium
Butylated Hydroxytoluene
lithium
examination
Ligands
ligands
Lewis Bases
Lewis base
Crystallization
Magnesium
Nuclear magnetic resonance spectroscopy
magnesium
chemistry
crystallization
nuclear magnetic resonance
spectroscopy

ASJC Scopus subject areas

  • Inorganic Chemistry

Cite this

Lithium aryloxo magnesiates : An examination of ligand size and donor effects. / Zuniga, Maria Felisa; Kreutzer, Johannes; Teng, Weijie; Ruhlandt, Karin.

In: Inorganic Chemistry, Vol. 46, No. 24, 26.11.2007, p. 10400-10409.

Research output: Contribution to journalArticle

Zuniga, Maria Felisa ; Kreutzer, Johannes ; Teng, Weijie ; Ruhlandt, Karin. / Lithium aryloxo magnesiates : An examination of ligand size and donor effects. In: Inorganic Chemistry. 2007 ; Vol. 46, No. 24. pp. 10400-10409.
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abstract = "The combination of equimolar amounts of LiOAr and Mg(OAr)2 (OAr = aryloxide) in polar media afforded several lithium aryloxomagnesiates. Factors influencing the structural chemistry of the compounds, such as the degree of ligand bulk, type of Lewis base donors, and crystallization solvent, are examined. Structural characterization reveals a discrete, solvent-separated species, [Li(thf)4][Mg(BHT)3]·THF (1) (BHT = 2,6-tBu2-4-MeC6H2O) and a family of molecular compounds with various Li/Mg stoichimetries, including a 1:1 Li/Mg ratio in [LiMg(Odpp)3(thf)2]·0.5PhMe (2) (Odpp = 2,6-Ph 2C6H3O) and [Li(Et2O)Mg(Odpp) 3]·0.5PhMe (3), a 2:1 Li/Mg ratio as in [{Li(thf) 2}2Mg(OMes)4]·2THF (4) (OMes = 2,4,6-Me3C6H2O) and [{Li(tmeda)} 2Mg(m-Odtp)4]·0.5Et2O (5) (m-Odtp = 3,5-tBu2C6H3O), and a novel 2:3 Li/Mg ratio in [{Li(thf)2}2Mg3(m-Odtp)8(thf) 2]·3THF (6). Two new homometallic magnesium bis(aryloxides), Mg(Odpp)2(thf)2 (7) and Mg(Odpp)2(Et 2O)2 (8), are also included for the sake of comparison. The solution behavior of the heterobimetallic compounds in arene and polar solvent is analyzed by 1H NMR spectroscopy.",
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