Synthesis and structural characterization of lithium and iron complexes containing a chelating phenolate phosphane ligand

Lan Chang Liang; Yu Ning Chang; Huan Yu Shih; Sheng Ta Lin; Hon Man Lee

doi:10.1002/ejic.201100260

Synthesis and structural characterization of lithium and iron complexes containing a chelating phenolate phosphane ligand

Lan Chang Liang, Yu Ning Chang, Huan Yu Shih, Sheng Ta Lin, Hon Man Lee

Department of Chemistry

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Abstract

The preparation and characterization of lithium and iron(II) complexes containing a potentially tridentate biphenolate phosphane ligand are reported. Deprotonation of 2,2′-phenylphosphanyl-bis(4,6-di-tert-butylphenol) (H₂L^Ph) with one or two equivalents of nBuLi in diethyl ether solutions at-35 °C produces binuclear {Li(HL^Ph)(OEt ₂)}₂ or tetranuclear Li₄(L^Ph) ₂(OEt₂)₃, respectively. An X-ray study of {Li(HL^Ph)(OEt₂)}₂ showed it to be a C _i-symmetric dimer composed of two Li(HL^Ph)(OEt ₂) units linked with dative O-Li bonds involving phenolate oxygen donor atoms whereas that of Li₄(L^Ph)₂(OEt ₂)₃ revealed a C₂-symmetric structure in which the two biphenolate phosphane ligands are linked with four lithium atoms that bind to three diethyl ether molecules. Treatment of FeCl₂ with one or two equivalents of Na₂(L^Ph)(DME)₂ in THF at-35 °C generates binuclear Fe₂(L^Ph)₂(THF) ₂ or mononuclear Fe(HL^Ph)₂(THF)₂, respectively. The two iron(II) centers in Fe₂(L^Ph) ₂(THF)₂ are antiferromagnetically coupled.

Original language	English
Pages (from-to)	4077-4082
Number of pages	6
Journal	European Journal of Inorganic Chemistry
Issue number	26
DOIs	https://doi.org/10.1002/ejic.201100260
Publication status	Published - 2011 Sep 1

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All Science Journal Classification (ASJC) codes

Inorganic Chemistry

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Liang, L. C., Chang, Y. N., Shih, H. Y., Lin, S. T., & Lee, H. M. (2011). Synthesis and structural characterization of lithium and iron complexes containing a chelating phenolate phosphane ligand. European Journal of Inorganic Chemistry, (26), 4077-4082. https://doi.org/10.1002/ejic.201100260

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abstract = "The preparation and characterization of lithium and iron(II) complexes containing a potentially tridentate biphenolate phosphane ligand are reported. Deprotonation of 2,2′-phenylphosphanyl-bis(4,6-di-tert-butylphenol) (H2LPh) with one or two equivalents of nBuLi in diethyl ether solutions at-35 °C produces binuclear {Li(HLPh)(OEt 2)}2 or tetranuclear Li4(LPh) 2(OEt2)3, respectively. An X-ray study of {Li(HLPh)(OEt2)}2 showed it to be a C i-symmetric dimer composed of two Li(HLPh)(OEt 2) units linked with dative O-Li bonds involving phenolate oxygen donor atoms whereas that of Li4(LPh)2(OEt 2)3 revealed a C2-symmetric structure in which the two biphenolate phosphane ligands are linked with four lithium atoms that bind to three diethyl ether molecules. Treatment of FeCl2 with one or two equivalents of Na2(LPh)(DME)2 in THF at-35 °C generates binuclear Fe2(LPh)2(THF) 2 or mononuclear Fe(HLPh)2(THF)2, respectively. The two iron(II) centers in Fe2(LPh) 2(THF)2 are antiferromagnetically coupled.",

author = "Liang, {Lan Chang} and Chang, {Yu Ning} and Shih, {Huan Yu} and Lin, {Sheng Ta} and Lee, {Hon Man}",

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N2 - The preparation and characterization of lithium and iron(II) complexes containing a potentially tridentate biphenolate phosphane ligand are reported. Deprotonation of 2,2′-phenylphosphanyl-bis(4,6-di-tert-butylphenol) (H2LPh) with one or two equivalents of nBuLi in diethyl ether solutions at-35 °C produces binuclear {Li(HLPh)(OEt 2)}2 or tetranuclear Li4(LPh) 2(OEt2)3, respectively. An X-ray study of {Li(HLPh)(OEt2)}2 showed it to be a C i-symmetric dimer composed of two Li(HLPh)(OEt 2) units linked with dative O-Li bonds involving phenolate oxygen donor atoms whereas that of Li4(LPh)2(OEt 2)3 revealed a C2-symmetric structure in which the two biphenolate phosphane ligands are linked with four lithium atoms that bind to three diethyl ether molecules. Treatment of FeCl2 with one or two equivalents of Na2(LPh)(DME)2 in THF at-35 °C generates binuclear Fe2(LPh)2(THF) 2 or mononuclear Fe(HLPh)2(THF)2, respectively. The two iron(II) centers in Fe2(LPh) 2(THF)2 are antiferromagnetically coupled.

AB - The preparation and characterization of lithium and iron(II) complexes containing a potentially tridentate biphenolate phosphane ligand are reported. Deprotonation of 2,2′-phenylphosphanyl-bis(4,6-di-tert-butylphenol) (H2LPh) with one or two equivalents of nBuLi in diethyl ether solutions at-35 °C produces binuclear {Li(HLPh)(OEt 2)}2 or tetranuclear Li4(LPh) 2(OEt2)3, respectively. An X-ray study of {Li(HLPh)(OEt2)}2 showed it to be a C i-symmetric dimer composed of two Li(HLPh)(OEt 2) units linked with dative O-Li bonds involving phenolate oxygen donor atoms whereas that of Li4(LPh)2(OEt 2)3 revealed a C2-symmetric structure in which the two biphenolate phosphane ligands are linked with four lithium atoms that bind to three diethyl ether molecules. Treatment of FeCl2 with one or two equivalents of Na2(LPh)(DME)2 in THF at-35 °C generates binuclear Fe2(LPh)2(THF) 2 or mononuclear Fe(HLPh)2(THF)2, respectively. The two iron(II) centers in Fe2(LPh) 2(THF)2 are antiferromagnetically coupled.

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