Chapter 6 The polyatomic molecules

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Three center two electron B-H-B bond:ψ 3ψ B1 ψ B 2ψ 2ψ Hψ 1HHBHHBHHii. B 5 H 9Electron-deficient multi-center bondsHBHBHHHBHHBHBHEBβ- E β βEBβ β- E β = 0EB- Esolve seqular equationEE12= E= EB3+ 2β= E1ψ1= ( ψa3B− β+ ψ + ψ )baBBB3center-2electron bonds
Chemical bonds in Boranes(a) Single bondB-HB-B(b) 3center-2electron bonds(c) Other polycenter-polyelectron bondElectron-deficient multi-center bonds6.1.2 For B nH n+m’s open structure (including to nido and arachno)n equals to number of B-H bondsIts stationary condition:x = m-st = n-sy = (2s-m)/2p sets of styxp isomers<strong>The</strong> topological structure of B 6 H 10B n H n+m (WilliamLipscomb) Nobelprize,1976BHHBHHBHBBHHBBHHHBBHBHBs t y x(3 isomers)HHBBHBBBHHBHBBHHHHHBBHHBBH 2HBBH 2BHH(4220) (3311) (2402)
Page 1: §6 The polyatomic molecules (B)6.1
Page 5: polyhedra with n vertices“Closo
Page 8 and 9: Alkali metals and alkali earth meta
Page 10 and 11: 6.2.1 Coordination polyhedronmolecu
Page 12 and 13: A. Crystal field splitting1. spectr
Page 14 and 15: II. Crystal-Field TheoryB. Magnetic
Page 16 and 17: Energetic diagram of σ molecular o
Page 18 and 19: 18-electron rule• Many ligands do
Page 20 and 21: Generalized 8 - N rulePearson (1964
Page 22 and 23: Polycationic valence compounds• H
Page 24 and 25: ii.Electron countingb=12(18n−g)b:
Page 26 and 27: Tetranuclear compoundsIr 4 (CO) 12
Page 28: 2. Carbon nanotubes200 nm 1µm6.6 H

Chapter 6 The polyatomic molecules

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