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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Ternary alkali metal transition metal acetylides
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Ternary alkali metal transition metal acetylides

机译：三元碱金属过渡金属乙炔化物

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The first alkali metal transition metal acetylides of general composition A(2)M(0)C(2) (A = Na - Cs, M-0 = Pd, Pt) were obtained by solid state reactions of alkali metal acetylides with palladium and platinum. They are characterized by (1)(infinity)[M-0(C-2)(2/2)(2-)] chains, which are separated by alkali metal ions. Analogous (1)(infinity)[M-1(C-2)(2/2)(-)] chains also separated by alkali metal ions are the characteristic structural feature of acetylides of composition AM(1)C(2), which are accessible by reacting AC(2)H with (MI)-I-1 in liquid ammonia (A = Li - CS, M-1 = Cu, Ag, Au). Despite their structural similarities they possess different properties, as acetylides of composition A(2)M(0)C(2) are semiconductors with very small indirect band gaps and slightly extended C-C distances compared to a C-C triple bond, whereas acetylides of composition AM(1)C(2) show a typical salt-like behavior with C-C distances close to the expected value for a C-C triple bond of 120 pm. But With the help of simple chemical models these differences can be made plausible. Furthermore, it is shown that only by a combination of different methods (powder diffraction with X-rays and neutrons, solid state NMR spectroscopy, Raman spectroscopy) it was possible to characterize this new class of compounds structurally and chemically.
机译：通过碱金属乙炔化物与钯和钯的固相反应获得通式A（2）M（0）C（2）（A = Na-Cs，M-0 = Pd，Pt）的第一碱金属过渡金属乙炔化物铂。它们的特征是（1）（无限）[M-0（C-2）（2/2）（2-）]链，这些链被碱金属离子隔开。同样被碱金属离子隔开的类似（1）（无穷大）[M-1（C-2）（2/2）（-）]链是组成AM（1）C（2）的乙炔的特征结构特征，可以通过使AC（2）H与（MI）-I-1在液氨中反应来获得（A = Li-CS，M-1 = Cu，Ag，Au）。尽管它们在结构上相似，但它们具有不同的特性，因为组成A（2）M（0）C（2）的乙炔是具有很小的间接带隙且与CC三键相比CC距离稍长的半导体，而组成AM的乙炔（1）C（2）显示了典型的盐样行为，CC距离接近120 pm CC三键的预期值。但是，借助简单的化学模型，这些差异可能变得合理。此外，已经表明，只有通过不同方法的组合（X射线和中子的粉末衍射，固态NMR光谱，拉曼光谱），才能在结构和化学上表征这类新化合物。

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