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
中科院分区:
文献类型:
--
作者:
Horn, Bettina;Pfirrmann, Stefan;Metzinger, Ramona
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).