i.B2He three center two electron B-H-B bond: B:sp hybridization,H:Is orbital y=CaΨB1+CbΨH+CaΨB2 its seqular equation is: H E8-E B 0 B En-E B =0 0 B E8-E B B E=Eg+2B (bonding) E2=Eg (E2>En) (anti-bonding) 33 E;=E8-2B (anti-bonding) 12189 1 19.2pm 必1= (ya1+V2yH+y2） 2 177pm 1 Ψ2= 5(ΨB1-ΨB2) H.C.Longuet-Higgins(朗奎特-希金斯 桥式三中心双电子模型 1 =2 (9B1-V2yH+Ψ2) p125 HMO method 0 0 E - E E - E E - E 0 itsseqular equation is: : , :1 three center two electron B- H - B bond : B H B 1 3          a B b H a B2 c c c B sp hybridization H s orbital i. B2H6 ( 2 ) 21 ( ) 21 ( 2 ) 21 2 (anti - bonding ) ( ) (anti - bonding ) 2 (bonding ) 3 1 2 2 1 2 1 1 2 3 2 2 1 B H B B B B H B B B H B E E E E E E E E                            B H H H H B H H 96.5° 121.8° B H H H H H H B H. C. Longuet-Higgins(朗奎特-希金斯) 177pm 桥式三中心双电子模型