Chapter 6 The polyatomic molecules

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Generalized 8 - N rulePearson (1964), Hulliger & Mooser (1965)8 - VEC A = AA - CC / (n/m) for C m A nVEC A : Number of valence electrons par anionVEC A < 8, AA>0, CC=0 Polyanionic val. comp.VEC A = 8, AA=0, CC=0 Normal valence compoundVEC A > 8, AA=0, CC>0 Polycationic val. comp.AA: Average number of A-A bonds per anionCC; Average number of C-C bonds per cations and/orelectrons used for inert-electron pairs on cations
Polyanionic valence compound (1)K 6 Pd 2+ Se 20 : VEC A = 128/20, AA=8/5K 6 Pd[Se 5 ] 4AA = 1AA = 4/3AA = 6/4AA = 8/5N‘ A/M = 2/(2 - AA)N‘ A/M : Averagenumber of atoms in anon-cyclic chargedanion moleculePolyanionic valence compounds (2)• LaAs 2 : VEC A = 6.5; AA = 3/2; N A/M = 4• La 2^[As 4 ] LT, La 4^[As 3 ] ^[As 5 ] HT• CsTe 4 : VEC A = 6.25; AA = 7/4; N A/M = 8• Cs 2^[Te 8 ]• Th 2 S 5 : VEC A = 7.6; AA = 2/5• Th 2^[S 2 ][S] 3• Sr 5 Si 3 : VEC A = 7.33; AA = 2/3• Sr 5^[S 2 ][S]
Page 1 and 2: §6 The polyatomic molecules (B)6.1
Page 3 and 4: Chemical bonds in Boranes(a) Single
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 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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