The first ligand stabilized SiCl22+ dications were synthesized using N-methylimidazole as co-ordinating ligand. The compounds SiCl4, SiBr2Cl2, and SiH2Cl2 form six-co-ordinated dicationic compounds of almost octahedral symmetry with similar structures which were investigated by single crystal X-ray analysis and density functional calculations. The structures exhibit particularly short dative Si–N bonds of about 1.90 Å. Complexes crystallized from the same solvent are isostructural. A different solvent, though, leads to geometrical variations. It was also discovered that the halogen exchange process among mixed silicon tetrahalides occurs under much milder conditions than previously thought and proceeds with considerable speed even without a catalyst.
以 N-甲基咪唑为配位配体,合成了第一个配位稳定的 SiCl22+ 双阳离子。SiCl4、SiBr2Cl2 和 SiH2Cl2 化合物形成了六配位二阳离子化合物,其结构几乎呈八面体对称,并通过单晶 X 射线分析和密度泛函计算进行了研究。通过单晶 X 射线分析和密度泛函计算研究发现,这些结构显示出约 1.90 Å 的特别短的 Si-N 键。然而,不同的溶剂会导致几何结构的变化。研究还发现,混合四卤化硅之间的卤素交换过程是在比以前想象的要温和得多的条件下进行的,而且即使没有催化剂也能以相当快的速度进行。
D'Errico, John J.; Sharp, Kenneth G., Inorganic Chemistry, 1989, vol. 28, # 11, p. 2177 - 2180