The compound (SiEt₃)₂(B₁₂F₁₂) was generated in hexane by reacting SiHEt₃ with (CPh₃)₂(B₁₂F₁₂) in a 2:1 mol ratio. A small crop of crystals of the very reactive compound (SiEt₃)₂(B₁₂F₁₂) suitable for diffraction was isolated and its structure was determined by X-ray crystallography (Pbca, a = 16.67(1) Å, b = 17.77(1) Å, c = 18.53(1) Å). Two SiR₃⁺ cation-like moieties are weakly bonded to F atoms on opposite sides of the B₁₂F₁₂²⁻ anion. The SiF distances are 1.832(2) and 1.842(2) Å. The BF(Si) distances, at 1.459(5) and 1.464(5) Å, are 0.087−0.109 Å (i.e., 17–21 σ) longer than the other ten BF distances. This is the first time that statistically significant BF bond lengthening due to coordination of B₁₂F₁₂²⁻ to a cation has been observed.

通过使SiHEt ₃与（CPh ₃）₂（B ₁₂ F ₁₂）以2：1摩尔比反应，在己烷中生成化合物（SiEt ₃）₂（B ₁₂ F ₁₂）。分离出一小部分适合衍射的高反应性化合物（SiEt ₃）₂（B ₁₂ F ₁₂）晶体，并通过X射线晶体学确定其结构（Pbca，a = 16.67（1）Å，b = 17.77 （1），c = 18.53（1））。两个SiR ₃ ⁺阳离子状部分与B ₁₂ F ₁₂ ^2-阴离子相对侧的F原子弱键合。Si F距离为1.832（2）和1.842（2）。B F（Si）距离为1.459（5）和1.464（5），比其他十个B F距离长0.087-0.109Å（即17-21σ）。这是首次观察到由于B ₁₂ F ₁₂ ^2-与阳离子的配位而导致统计上显着的B F键延长。