课程名称︰化学键 课程性质︰化学系内选修 课程教师︰王瑜教授 开课学院：理学院 开课系所︰化学系 考试日期（年月日）︰2010/6/25 考试时限（分钟）：110+20(延长) 是否需发放奖励金：是 （如未明确表示，则不予发放） 试题 : Chemical Bond June 25, 2010 1 Assign the orbital symmetries of C-H σ-bonds in CH4 and CH2Cl2 respectively find the orbital correlation between the two. What are the respective C-H,C-Cl stretching modes. 2 Describe all the symmetry elements in point group C4V and D3h. 3 Five-coordinated metal complexs, ML5, are often found in square pyramid or in trigonal bipyramid; compare the d-orbital splitting of the metal in these two geometries; discuss the relative stability for d^n n=4~8. Describe the molecule orbital(σandπbonds) in each geometry. 4 Describe the possible π and δ bonds in metal-metal bond; Why the bond order of Re2Cl8(2-) (D4h) and Os2Cl8(2-) (D4d) is 4 and 3 respectively 5 Explain why ligand field strength is in the order: CO > OH2 > F-? interpret the order in terms of M-L σ and π bonds. 6 Why there is strong Jahn-Teller distortion for d9; high spin d4 and low spin d7 system in Oh geometry. 7 Give the point group for each following species: cis-PtCl2(NH2)2 trans-PtCl2(NH2)2 1,4-dichlorobenzene SF4 XeF4 O2H2 C6H6Cr(CO)3 ethane(C2H6) ethylene(C2H4) acetylene(C2H2) urea (NH2)2CO 还有四个图......没办法画 一个是左右对称上下不对称的 一个是类似benz的中心往外有三个同样的瓣，有三条对称轴 一个是一朵花，有五瓣，有五条对称轴 一个是一个圆圈里面有的十字，有四条对称轴 --

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