五甲基環戊二烯基之十三族錯合物之合成

Abstract

十三族錯合物具有路易士酸性的特性，為了提升其酸性，加上額外的正電荷可以有效地提升其路易士酸性。這類的錯合物缺電子且配位數低，必須用立障大且可提供電子的配位基來穩定。五甲基環戊二烯基以及氮異環碳烯都是優秀的配位基，因為其立障大且可提供電子穩定缺電子的金屬中心。在此論文中，我們嘗試結合此兩種不同性質的配位基來合成十三族二價陽離子。其中，成功合成鋁二價錯合物離子對，並用單晶繞射確定其結構。我們也研究一系列十三族化合物的反應性。

To increase the Lewis acidity of group 13 derivatives, introduction of positive charge is one of the effective methods. In order to stabilize the electron-deficient and low-coordinate species, bulky and electron-donating ligands are indispensable. Pentamethylcyclopentadienyl (Cp*) is a good candidate due to its flexible conformation and electron-rich nature, and has been utilized in stabilizing low-coordinate main group elements. In addition, strong s-donating N-heterocyclic carbene ligand is also applied to provide further kinetic and thermodynamic stability to the cationic group 13 derivatives. As an extension to our recent success in the isolation of low-coordinate boron dication, aluminum contact ion pairs are synthesized and structurally characterized. Several pentamethylcyclopetadienyl group 13 complexes are also synthesized. Reactivity studies these group 13 complexes will also be discussed.