首页> 外文期刊>Chemistry: A European journal >Metal-Metal Bonds between Group 12 Metals and Tin: Structural Characterization of the Complete Series of Sn-M-Sn (M = Zn, Cd, Hg) Heterodimetallic Complexes
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Metal-Metal Bonds between Group 12 Metals and Tin: Structural Characterization of the Complete Series of Sn-M-Sn (M = Zn, Cd, Hg) Heterodimetallic Complexes

机译:第12组金属和锡之间的金属金属键:完整系列的Sn-M-Sn(M = Zn,Cd,Hg)异二金属配合物的结构表征

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Reaction of the lithium triamidostannate [MeSi{SiMe_2N(P-Tol)}_(3~-)SnLi(OEt_2)] (1) with 0.5 molar equivalents of MCl_2 (M = Zn, Cd, Hg) in toluene afforded the corresponding heterodimetallic complexes [MeSi{Si-Me_2N(p-Tol)}_3Sn]_2M {M = Hg (2), Cd (3), and Zn (4)}. The molecular structures of the mercury and cadmium complkexes were determined by X-ray diffraction and found to adopt a linear Sn-M-Sn metal-metal bonded array (d(Sn-Hg) 2.6495(2), d(Sn-Cd) 2.6758(1) A), these being the first Hg-Sn and Cd-Sn bonds to be characterized by X-ray diffraction. That the Hg-Sn bonds are shorter than the Cd-Sn bonds in the isomorphous complexes is attributed to relativistic effects in the mercury system. In contrast, the structure of the Zn analogue is unsymmetrical with one stannate unit being Sn-Zn bonded (d(Sn(1)-Sn) 2.5782 (4)A), while the Zn~(II) atom bridges two amido functions of the second stannate cage, thus representing a second isomeric form of these complexes. The different degree of metal-metal bond polarity is reflected in the ~(119)Sn NMR chemical shifts of the three complexes. Variable-temperature NMR studies and a series of ~1H ROESY experiments of the cadmium complex 3 in solution revealed a dynamic exchange between the two isomers.
机译:三酰胺锡酸锂[MeSi {SiMe_2N(P-Tol)} _(3〜-)SnLi(OEt_2)](1)与0.5摩尔当量的MCl_2(M = Zn,Cd,Hg)在甲苯中的反应得到相应的杂二金属配合物[MeSi {Si-Me_2N(p-Tol)} _ 3Sn] _2M {M = Hg(2),Cd(3)和Zn(4)}。通过X射线衍射测定汞和镉化合物的分子结构,发现采用线性Sn-M-Sn金属-金属键合阵列(d(Sn-Hg)2.6495(2),d(Sn-Cd) 2.6758(1)A),它们是要通过X射线衍射表征的第一个Hg-Sn和Cd-Sn键。在同构络合物中,Hg-Sn键比Cd-Sn键短的原因是汞系统中的相对论效应。相反,Zn类似物的结构是不对称的,一个锡酸酯单元被Sn-Zn键合(d(Sn(1)-Sn)2.5782(4)A),而Zn〜(II)原子桥接了两个第二个锡酸盐笼,因此代表这些复合物的第二个异构形式。这三种配合物的〜(119)Sn NMR化学位移反映了不同程度的金属-金属键极性。溶液中镉络合物3的可变温度NMR研究和一系列〜1H ROESY实验表明,两种异构体之间存在动态交换。

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