課程名稱︰化學鍵 課程性質︰化學系內選修 課程教師︰王瑜教授 開課學院：理學院 開課系所︰化學系 考試日期（年月日）︰2010/6/25 考試時限（分鐘）：110+20(延長) 是否需發放獎勵金：是 （如未明確表示，則不予發放） 試題 : 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 還有四個圖......沒辦法畫 一個是左右對稱上下不對稱的 一個是類似benz的中心往外有三個同樣的瓣，有三條對稱軸 一個是一朵花，有五瓣，有五條對稱軸 一個是一個圓圈裡面有的十字，有四條對稱軸 --

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