正常共价键：共价键的共用电子对由成键原子双方各提供一个电子而组成配位共价键coordinatedcovalentbond：共用电子6对由一方单独提供表示配位键，箭头由给予体指向接受体Coordinationcompoundsl Complexes形成条件：成键原子一方有孤对电子，另一方有空轨道。NHt[BF, ] HF*H-N-HF-B-FFH10
16 正常共价键：共价键的共用电子对由成键原子双 方各提供一个电子而组成 配位共价键coordinated covalent bond ：共用电子 对由一方单独提供。“ ”表示配位键，箭头 由给予体指向接受体. Coordination compounds/ Complexes 形成条件：成键原子一方有孤对电子，另一方有 空轨道。 + NH4 − BF4 H − N − H H H F − B − F F F
If the electron-pair is provided by one atomand the other atom only provides an emptyorbital, the consequent covalent bond iscalled coordinated covalent bondCompounds with coordinated covalent bondare called coordination compounds, orcomplexes17
17 ◼ If the electron-pair is provided by one atom and the other atom only provides an empty orbital, the consequent covalent bond is called coordinated covalent bond. Compounds with coordinated covalent bond are called coordination compounds, or complexes
1Minute Paper:Writedown the molecules thatcanbeexplainedby applyingValenceBondTheory?18
18 1 Minute Paper： Write down the molecules that can be explained by applying Valence Bond Theory?
DiamondFullereneGraphiteFigure 9-6 Structures of graphite, diamond and fullerene C6o19
19 Graphite Diamond Fullerene Figure 9-6 Structures of graphite, diamond and fullerene C60
Ouestion2:How to explain the structures of graphite,diamond and fullerene Coo?How to determine the geometric structuresof molecules consisting of one centralatom surrounded by other atoms, ABmsuchas CH420
20 Question 2: How to explain the structures of graphite, diamond and fullerene C60? How to determine the geometric structures of molecules consisting of one central atom surrounded by other atoms, ABm, such as CH4 ?