N2 Activation in NiI-NN-NiI Units: The Influence of Alkali Metal Cations and CO Reactivity

N2 Activation in NiI-NN-NiI Units: The Influence of Alkali Metal Cations and CO Reactivity
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DOI:
10.1002/zaac.201100140
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发表时间:
2011-07-01
影响因子:
1.4
通讯作者:
Metzinger, Ramona
Metzinger, Ramona
中科院分区:
化学4区
文献类型:
--
作者:
Horn, Bettina;Pfirrmann, Stefan;Metzinger, Ramona

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在二氮络合物[(LNi)-Ni-tBu(mu-eta(1):N-2)NiLtBu](I)与KCl 8的单电子还原之后,所得化合物K[(LNi)-Ni-tBu(mu-eta(1):eta(1)-N2)NiLtBu](II)与钠砂的反应产生KNa[(LNi)-Ni-tBu(mu-eta(1):eta(1)-N-2)NiLtBu](1),其含有两种不同的碱金属离子。用2当量的钠砂处理I得到对称配合物Na-2[(LNi)-Ni-tBu(mu-eta(1):eta(1)-N-2)NiLtBu](2)。通过单晶X射线衍射分析和拉曼光谱对配合物1和2进行了研究,并将结果与含有两个K+离子的K-2[(LNi)-Ni-tBu(mu-eta(1):eta(1)-N-2)NiLtBu](III)的数据进行了比较。由此可知,化合物M-2[(LNi)-Ni-tBu(μ-η(1):η(1)-N-2)NiLtBu]中的碱金属离子M的性质对NN键的活化程度几乎没有影响。此外,还表明用CO处理二镍(I)络合物III得到二镍(0)化合物K-2[(LNi)-Ni-tBu(CO)](2)(4)和N-2。未还原的二镍(I)络合物I与CO反应导致N-2配体的更简单的置换和[(LNi)-Ni-tBu(CO)](3)的形成。
After single electron reduction of the dinitrogen complex [(LNi)-Ni-tBu(mu-eta(1):N-2)NiLtBu] (I) with KC8, reaction of the resulting compound K[(LNi)-Ni-tBu(mu-eta(1):eta(1)-N2)NiLtBu] (II) with sodium sand yields KNa[(LNi)-Ni-tBu(mu-eta(1):eta(1)-N-2)NiLtBu] (1), which contains two different alkali metal ions. Treatment of I with two equivalents of sodium sand leads to the symmetric complex Na-2[(LNi)-Ni-tBu(mu-eta(1):eta(1)-N-2)NiLtBu] (2). Complexes 1 and 2 were investigated by single crystal X-ray diffraction analysis as well as by Raman spectroscopy, and the results were compared with the data of K-2[(LNi)-Ni-tBu(mu-eta(1):eta(1)-N-2)NiLtBu] (III), which contains two K+ ions. Thus, it became obvious that the nature of the alkali metal ion M in compounds M-2[(LNi)-Ni-tBu(mu-eta(1):eta(1)-N-2)NiLtBu] has hardly any influence on the degree of NN bond activation. Furthermore, it was shown that treatment of the dinickel(I) complex III with CO leads to the dinickel(0) compound K-2[(LNi)-Ni-tBu(CO)](2) (4) and N-2. Reaction of the unreduced dinickel(I) complex I with CO leads to a more simple replacement of the N-2 ligand and formation of [(LNi)-Ni-tBu(CO)] (3).