论文部分内容阅读
一、引言自从第一个含有BH_4~-阴离子的金属硼氢化物问世以来,因具有低沸点、高挥发性而引起人们重视。已制得少数铀、镎、钚、钍等硼氢化物。BH_4~-与金属键合方式有单齿、双齿、双齿桥联及叁齿四种形式,如图1所示。具有桥联的硼氢化物形成多聚体。此外,金属尚可与中性配位体如醚、四氢呋喃等配位。单核及简单二聚体的硼氢化物沸点较低,有可能用于扩散法或激光法分离同位素,因此研究铀硼氢化物结构类型有重要意义。本文用堆积模型解释已知并预测未知铀(Ⅲ)(Ⅳ)硼氢化物(包括含中性配位体)的分子结构类型。
I. INTRODUCTION Since the advent of the first metal borohydride containing BH_4 ~ - anions, it has drawn great attention due to its low boiling point and high volatility. A small number of borohydrides of uranium, 镎, plutonium and thorium have been prepared. BH_4 ~ - with metal bonding with a single tooth, bidentate, bidentate bridging and three teeth in four forms, as shown in Figure 1. Borohydride with bridging forms a multimer. In addition, the metal can still with the neutral ligands such as ether, tetrahydrofuran and other coordination. Boron hydrides of mononuclear and simple dimers have lower boiling points and may be used for diffusion or laser separation of isotopes. Therefore, it is of great significance to study the structure types of uranium borohydride. In this paper, the stacking model is used to explain the molecular structure types of known and predicted uranium (Ⅲ) (Ⅳ) borohydrides (including neutral ligands).