因为对于三片分子,c 最多等于1,故π=6,即 Re_3三元环之间应以三重键相结合,如2式所示,式中 R 代表 CH_2SiMe_3。X 射线结构分析证明三个 Re 原子居于正三角形的顶点,键长特别短,只有2.387(?),而Re 原子的共价单键半径 R_(cov)=1.55(?),金属铼中 Re—Re 键长为2.74(?),由此可见判定此分子中 Re 原子之 Because for three molecules, c is equal to 1 at most, so π = 6, that is, the three-membered ring Re_3 should be combined by a triple triple bond, as shown in Equation 2, where R represents CH 2 SiMe 3. X-ray structure analysis proves that the three Re atoms occupy the vertices of the equilateral triangle, the bond length is very short, only 2.387 (?), And the Re atom covalent single bond radius R cov = 1.55 (?), The metal rhenium Re- Re bond length of 2.74 (?), Which shows that the determination of this molecule Re atom