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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Trifluorophosphine as a bridging ligand in homoleptic binuclear nickel complexes
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Trifluorophosphine as a bridging ligand in homoleptic binuclear nickel complexes

机译:三氟膦作为均配双核镍配合物中的桥联配体

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摘要

The stable tetrahedral derivative Ni(PF_3)_4 is reported to generate binuclear Ni_2(PF_3)_n ions in its mass spectrum emerging from ion-molecule reactions. Theoretical studies on such binuclear complexes indicate Ni_2(PF_3)_7 to be energetically unfavorable with respect to decomposition into Ni(PF _3)_4 + Ni(PF_3)_3. However, viable rather unsymmetrical structures with two PF_3 bridges for Ni _2(PF_3)_n (n = 6, 5, 4) are reported here as well as a triply semibridged Ni_2(PF_3)_5 structure. The nickel-nickel distances in these Ni_2(PF_3)_n derivatives suggest a formal double bond (2.51 ?), a formal triple bond (2.26 ?), and a formal double bond (2.34 ?) for n = 6, 5, and 4, respectively. The mononuclear Ni(PF_3)_n derivatives are predicted to have tetrahedral, trigonal planar, and bent (139°) structures for n = 4, 3, and 2, respectively.
机译:据报道,稳定的四面体衍生物Ni(PF_3)_4会在其质谱图中从离子分子反应中产生双核Ni_2(PF_3)_n离子。对此类双核络合物的理论研究表明,Ni_2(PF_3)_7在分解成Ni(PF _3)_4 + Ni(PF_3)_3时在能量上不利。但是,这里报道了具有两个用于Ni _2(PF_3)_n(n = 6、5、4)的PF_3桥的可行的非对称结构,以及三重半桥Ni_2(PF_3)_5的结构。这些Ni_2(PF_3)_n衍生物中的镍-镍距离表明,n = 6、5和4时,形式为双键(2.51?),形式为三键(2.26?)和形式为双键(2.34?)。 , 分别。预测单核Ni(PF_3)_n衍生物分别具有n = 4、3和2的四面体,三角形平面和弯曲(139°)结构。

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