摘要：

The crystal structure of dimethylmagnesium has been determined from X-ray powder diagrams. As in the case of dimethylberyllium polymeric chains are found and the unit cell is orthorhombic ( a = 6.00; b = 11.48; c = 5.45 Å, probable space group Ibam-D 26 2k). Mg-Mg distances in the chains are 2.73 Å and the metal atoms are connected by pairs of methyl bridges (Mg-C distance 2.24 Å) with an almost tetrahedral arrangement of four methyl groups around each metal atom. The bond distances indicate stronger bonds in the chains compared with dimethylberyllium and explain the lower volatility of the magnesium compound.

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