Stable magnesium(I) compounds with Mg-Mg bonds

Stable magnesium(I) compounds with Mg-Mg bonds
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DOI:
10.1126/science.1150856
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发表时间:
2007-12-14
期刊:
影响因子:
56.9
通讯作者:
Stasch, Andreas
Stasch, Andreas
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Green, Shaun P.;Jones, Cameron;Stasch, Andreas

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第2族金属(铍、镁、钙、锶和钡)的化学性质主要是+2氧化态。在这里,我们报道了两种碘化镁(II)与钾金属的络合物在甲苯中的还原,以中等产率产生热稳定的镁(I)化合物(L)MgMg(L)(其中L是[(Ar)NC(NPr 2 i)N(Ar)](-)或{[(Ar)NC(Me)](2)CH}(-),Ar是2,6-二异丙基苯基,Me是甲基,并且Pr 1是异丙基)。X射线晶体学和理论研究的结果与中心Mg-2(2+)单元一致,其具有分别为2.8508 +/-0.0012(标准偏差)和2.8457 +/-0.0008埃键长的单一共价镁-镁键相互作用,以及与阴离子配体(L)的主要离子相互作用.
The chemistry of the group 2 metals ( beryllium, magnesium, calcium, strontium, and barium) is dominated by the +2 oxidation state. Here, we report the reductions of two magnesium(II) iodide complexes with potassium metal in toluene, leading to thermally stable magnesium( I) compounds, ( L) MgMg( L) ( where L is [( Ar) NC(NPr2i) N( Ar)](-) or {[( Ar) NC( Me)](2)CH}(-), Ar is 2,6- diisopropylphenyl, Me is methyl, and Pr-i is isopropyl) in moderate yields. The results of x- ray crystallographic and theoretical studies are consistent with central Mg-2(2+) units that have single, covalent magnesium- magnesium bonding interactions with 2.8508 +/- 0.0012 ( standard deviation) and 2.8457 +/- 0.0008 angstrom bond lengths, respectively, and predominantly ionic interactions with the anionic ligands ( L).