Three- and Four-Coordinate Homoleptic Iron(I)–NHC Complexes: Synthesis and Characterization
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https://figshare.com/articles/dataset/Three_and_Four_Coordinate_Homoleptic_Iron_I_NHC_Complexes_Synthesis_and_Characterization/3081568
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资源简介：
The
use of the monodentate N-heterocyclic carbene (NHC) 1,3,4,5-tetramethylimidazol-2-ylidene
(IMe2Me2) and its N,N-diethyl and N,N-diisopropyl
analogues IEt2Me2 and IPr2Me2 enabled the preparation of the four-coordinate homoleptic
iron(I)–NHC complexes [(NHC)4Fe][BPh4] (NHC = IMe2Me2, 1; IEt2Me2, 2; IPr2Me2, 3) and the first three-coordinate homoleptic iron(I)–NHC
complex, [(IPr2Me2)3Fe][BPh4] (5). X-ray crystallographic studies revealed the tetrahedral
coordination geometries of the cations in 1 and 2, the square-planar geometry in 3, and the trigonal-planar
geometry in 5. 57Fe Mössbauer spectroscopy
and magnetic susceptibility measurements suggested that 1, 2, and 5 are high-spin (S = 3/2) iron(I) species and that 3 is a low-spin (S = 1/2) complex. 1H NMR and UV–vis–NIR spectroscopies revealed
the existence of tetrahedral–square-planar isomerization (for 2 and 3) and NHC dissociation (for 3) in solutions of 2 and 3.
创建时间：
2016-05-17
