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• W2014651821 abstract "Air- and moisture-sensitive Fe(NO)(3)(eta(1)-PF(6)) (1) may be conveniently prepared by treating Fe(NO)(3)Cl with 1 equiv of [Ag][PF(6)] in CH(2)Cl(2) or by reacting [NO][PF(6)] with excess iron filings in MeNO(2). Complex 1 is thermally sensitive both as a solid and in solutions, and is best handled below -20 degrees C. To isolate 1 reproducibly from MeNO(2) solutions it is necessary to remove all traces of propionitrile, which often occurs as an impurity in MeNO(2), because it reacts with Lewis-acidic 1 to form [Fe(NO)(3)(EtCN)][PF(6)] (2). If trace H(2)O is present during the synthesis of 1, some of the PF(6)(-) is converted to PO(2)F(2)(-), which is sufficiently Lewis basic that it captures two Fe(NO)(3)(+) fragments and forms [(ON)(3)Fe(mu-PO(2)F(2))Fe(NO)(3)][PF(6)] (3). Finally, Fe(NO)(3)(eta(1)-BF(4)) (4) can be obtained as a green microcrystalline powder by employing the same synthetic methodologies used to prepare 1. The new complexes 1-4 have been characterized by conventional spectroscopic methods, and the solid-state molecular structures of 2, 3, and 4 and their parent compound, Fe(NO)(3)Cl, have been established by X-ray diffraction methods. The iron centers in the Fe(NO)(3) fragments in all these structures exhibit approximately tetrahedral coordination geometries, and the Fe-N-O linkages are distinctly nonlinear with bond angles in the range of 159 to 169 degrees. DFT calculations on Fe(NO)(3)(eta(1)-BF(4)) (4) confirm that its bent Fe-N-O links have an electronic origin and need not be attributed to other factors, such as packing forces in the crystal. Interestingly, the bending of the NO ligands results in an increase in the energy of the HOMO, relative to the linear case, but at the same time causes a decrease in energy of the HOMO-1 and the HOMO-2 molecular orbitals. This more than compensates for the higher energy of the HOMO, resulting in a lower energy structure." @default.
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• W2014651821 date "2003-09-27" @default.
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• W2014651821 title "Toward Binary Nitrosyls: Distinctly Bent Fe−N−O Linkages in Base-Stabilized Fe(NO)₃⁺ Complexes" @default.
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• W2014651821 doi "https://doi.org/10.1021/ja036887r" @default.
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