The Missing Link: Manganese Complexes with Sterically Demanding Pyrrolyl Ligands

The Missing Link: Manganese Complexes with Sterically Demanding Pyrrolyl Ligands
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缺失的环节:具有空间要求的吡咯基配体的锰络合物

DOI:
10.1002/zaac.201500555
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发表时间:
2015
期刊:
Zeitschrift für anorganische und allgemeine Chemie
影响因子:
--
通讯作者:
M. D. Walter
M. D. Walter
中科院分区:
--
文献类型:
--
作者:
M. Kreye;M. Freytag;C. G. Daniliuc;P. G. Jones;M. D. Walter

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NaPyrtBu 2 [PyrtBu 2 = 2,5-(Me 3C)2C 4 H2 N]和KPyrtBu 2 Me 2 [PyrtBu 2 Me 2 = 2,5-(Me 3C)2 - 3,4-Me 2C 4 N]与MnI 2(thf)3反应,得到第一个双吡咯锰配合物。然而,根据Pyr-配体的身份,可以实现不同的配位模式。例如,MnII原子在[(κ N-PyrtBu 2)2 Mn](1-Mn)中是κ N配位的,而几种不同的物质被分离出具有更大体积的PyrtBu 2 Me 2配体。根据反应条件,最初形成κN-配位络合物[(κ N-PyrtBu 2 Me 2)2 Mn](2-Mn′),但在升华时转化为η 3配位异构体[(η3-PyrtBu 2 Me 2)2 Mn](2-Mn′)。在某些情况下,我们也可以识别2-Mn的THF加合物,得到[(κ N-PyrtBu 2 Me 2)(η2-PyrtBu 2 Me 2)Mn(thf)] [2-Mn(thf)],其中一个PyrtBu 2 Me 2配体以κ N配位模式结合,而另一个最好描述为η2-PyrtBu 2 Me 2。通过元素分析和X射线衍射研究对这些配合物进行了表征。密度泛函理论(DFT)计算证实,对于这些Mn II高自旋物种(S= 5/2),不同半抗原之间的势能面相当平坦。
Reaction of NaPyrtBu2[PyrtBu2= 2, 5‐(Me3C)2C4H2N] and KPyrtBu2Me2[PyrtBu2Me2= 2, 5‐(Me3C)2‐3, 4‐Me2C4N] with MnI2(thf)3resulted in the isolation of the first bis(pyrrolyl)manganese(II) complexes. However, different coordination modes are realized depending on the identity of the Pyr‐ligand. For example, the MnIIatom is κNcoordinate in [(κN‐PyrtBu2)2Mn] (1‐Mn), whereas several different species were isolated with the more bulky PyrtBu2Me2ligand. Depending on the reaction conditions the κN‐coordinate complex [(κN‐PyrtBu2Me2)2Mn] (2‐Mn′) is initially formed, but converts on sublimation to the η3coordinate isomer [(η3‐PyrtBu2Me2)2Mn] (2‐Mn′). In some cases we could also identify a THF adduct of2‐Mnto give [(κN‐PyrtBu2Me2)(η2‐PyrtBu2Me2)Mn(thf)] [2‐Mn(thf)], in which one PyrtBu2Me2ligand binds in a κNcoordination mode, while the other is best described as η2‐PyrtBu2Me2. These complexes were characterized by elemental analyses and X‐ray diffraction studies. Density functional theory (DFT) computations confirm that the potential energy surface between the different hapticities is rather flat for these MnIIhigh‐spin species (S= 5/2).
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发表时间: 1983
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影响因子: --
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