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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >On the feasibility of N2 fixation via a single-site Fe-I/Fe-IV cycle: Spectroscopic studies of Fe-I(N-2)Fe-I, Fe-IV equivalent to N, and related species
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On the feasibility of N2 fixation via a single-site Fe-I/Fe-IV cycle: Spectroscopic studies of Fe-I(N-2)Fe-I, Fe-IV equivalent to N, and related species

机译:关于通过单点Fe-I / Fe-IV循环固定N2的可行性:Fe-I(N-2)Fe-I,相当于N的Fe-IV和相关物种的光谱研究

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摘要

The electronic properties of an unusually redox-rich iron system, [PhBp(3)(R)]Fe-N-x (where [PhBp(3)(R)] is [PhB(CH2PR2)(3)](-)), are explored by Mossbauer, EPR, magnetization, and density-functional methods to gain a detailed picture regarding their oxidation states and electronic structures. The complexes of primary interest in this article are the two terminal iron(IV) nitride species, [PhBp(3)(iPr)]Fe equivalent to N (3a) and [PhBp(3)(CH2Cy)]Fe equivalent to N (3b), and the formally diiron(I) bridged- Fe(mu-N-2) Fe species, {[PhBp(3)(iPr)]Fe}(2)(mu-N-2) (4). Complex 4 is chemicall, related to 3a via a spontaneous nitride coupling reaction. The diamagnetic iron(IV) nitrides 3a and 3b exhibit unique electronic environments that are reflected in their unusual Mossbauer parameters, including quadrupole-splitting values of 6.01(1) mm/s and isomer shift values of -0.34(I) mm/s. The data for 4 suggest that this complex can be described by a weak ferromagnetic interaction (J/D < 1) between two iron(l) centers. For comparison, four other relevant complexes also are characterized: a diamagnetic iron(IV) trihydride [PhBp(3)(iPr)]Fe(H)(3)(PMe3) (5), an S = 3/2 iron(I) phosphine adduct [PhBp(3)(iPr)]FePMe3 (6), and the S = 2 iron(II) precursors to 3a, [PhBp(3)(iPr)]Fe-Cl and [PhBP3iPr]Fe-2,3:5,6-dibenzo-7-aza bicyclo[2.2.1]hepta-2,5-diene (dbabh). The electronic properties of these respective complexes also have been explored by density-functional methods to help corroborate our spectral assignments and to probe their electronic structures further.
机译:[PhBp(3)(R)] Fe-Nx(其中[PhBp(3)(R)]是[PhB(CH2PR2)(3)](-))的电子性质异常丰富,由Mossbauer,EPR,磁化和密度泛函方法进行探索,以获得有关其氧化态和电子结构的详细图片。本文主要关注的络合物是两个末端氮化铁(IV)物种,相当于[N](3a)的[PhBp(3)(iPr)] Fe,和相当于N []的[PhBp(3)(CH2Cy)] Fe。 3b),以及正式的二铁(I)桥接的Fe(mu-N-2)Fe物种,{[PhBp(3)(iPr)] Fe}(2)(mu-N-2)(4)。配合物4是化学性的,通过自发的氮化物偶联反应与3a有关。抗磁性氮化铁3a和3b表现出独特的电子环境,这些环境反映在其不寻常的Mossbauer参数中,包括四极分裂值6.01(1)mm / s和异构体位移值-0.34(I)mm / s。 4的数据表明,该复合物可以通过两个铁(I)中心之间的弱铁磁相互作用(J / D <1)来描述。为了进行比较,还对其他四个相关配合物进行了表征:抗磁性三氢化铁(IV)[PhBp(3)(iPr)] Fe(H)(3)(PMe3)(5),S = 3/2铁(I )膦加合物[PhBp(3)(iPr)] FePMe3(6),以及S = 2铁(II)3a,[PhBp(3)(iPr)] Fe-Cl和[PhBP3iPr] Fe-2的前体, 3:5,6-二苯并-7-氮杂双环[2.2.1]庚-2,5-二烯(dbabh)。这些各自的配合物的电子性质也已通过密度泛函方法进行了探索,以帮助证实我们的光谱分配并进一步探究其电子结构。

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