The molecular structure of 9,10-diethyl-9,10-diphospha-9,10-dihydroanthracene (PEPP) was determined by X-ray analysis. The central six-membered ring takes a boat conformation with two phosphorus atoms being the stem and stern, and the condensed tricyclic skeleton forms a butterfly-like structure. Of the two ethyl groups, which are attached to two P atoms in the central ring, the one is placed toward outside the skeleton (extra), and the other is located toward the inside of the ‘butterfly’ (intra). The observed redox potential of 0.63 V vs. Ag/AgCl suggests that this molecule has a fairly good electron-donating characteristics. From the spectroscopic observation and a quantum-chemical calculation, the donating orbital is estimated to be that of lone pair electrons at the P atom that attaches to the intra ethyl group.
通过 X 射线分析确定了 9,10-
二乙基-9,10-二
磷-
9,10-二氢蒽 (PEPP) 的分子结构。中央六元环呈船形构象,两个
磷原子为茎和艉,缩合的
三环骨架形成蝴蝶状结构。中央环的两个
磷原子上连接着两个乙基,其中一个乙基位于骨架外侧(外侧),另一个位于 "蝴蝶 "内侧(内侧)。与 Ag/AgCl 相比,观察到的氧化还原电位为 0.63 V,这表明该分子具有相当好的电子负载特性。根据光谱观察和量子
化学计算,估计供电子轨道是与内乙基相连的 P 原子上的孤对电子轨道。