Activation of 2,6-Bis(imino)pyridine Iron(II) Chloride Complexes by Methylaluminoxane: An Electrospray Ionization Tandem Mass Spectrometry Investigation
摘要:
The activation of the [2,6-bis(1-((2,6-diisopropylphenyl)imino)ethyl)pyridine]iron(II) chloride complex (1) with methylaluminoxane (MAO) was investigated in tetrahydrofuran (THF) by means of electrospray ionization tandem mass spectrometry (ESI-MS) complemented by LTV-visible spectroscopy studies. The four-coordinated cationic methyl iron(II) complex 2 ([LFe-Me](+), L = 2,6-bis(1-((2,6-diisopropylphenyl)imino)ethyl)pyridine) was identified in the ESI-MS experiment. In addition, the cationic monochloride iron(II) complex 3 ([LFe-Cl](+)), the product of a-H transfer from 2 to trimethylaluminum (TMA) [LFe-CH2AlMe2](+) (4), and the cationic iron hydride complex 5 ([LFe-H](+)) were identified. Correlation of the ESI-MS experiments with LTV-visible studies revealed that 2 and 3 are present in the THF solution as their solvent adducts.
Synthesis of iron(ii), manganese(ii) cobalt(ii) and ruthenium(ii) complexes containing tridentate nitrogen ligands and their application in the catalytic oxidation of alkanes
作者:George J. P. Britovsek、Jason England、Stefan K. Spitzmesser、Andrew J. P. White、David J. Williams
DOI:10.1039/b414813d
日期:——
series of Fe(II), Mn(II), Co(II) and Ru(II) complexescontaining bis(imino)pyridine or bis(amino)pyridine ligands and weakly coordinating triflate (OTf−) or non-coordinating SbF6− anions have been prepared. The complexes have been fully characterized including several solid-state structure analyses. Two unusual mono-chelate six-coordinate bis(imino)pyridine Fe(II) and Mn(II) complexes have been observed
一系列含Fe(II),Mn(II),Co(II)和Ru(II)的配合物双(亚氨基)吡啶 或者 双(氨基)吡啶配体和弱配位三氟甲磺酸酯(OTF - )或非配位的SbF 6 -的阴离子已经制备。配合物已得到充分表征,包括几种固态结构分析。已经观察到两种不寻常的单螯合物六配位双(亚氨基)吡啶Fe(II)和Mn(II)配合物。配合物的氧化催化性能环己烷对H 2 O 2的含量进行了评估。只有Fe(II)配合物显示出催化活性,这主要归因于Fenton型自由基的自催化作用。氧化作用。