Table of Contents
xiii
13-7 8-Electron 6-Centre Bonding Unites: Diformylhydrazine, N-alkyl
sydnones and Dehydrodithizone ........................................................... 181
13-8 “Increased-Valence” Structures for Longer N-Centre Bonding Units ..... 182
13-8 (a)
+
4
3
S N : 10-electron 7-centre bonding................................... 183
13-8 (b)
4 4
S N : 12–electron 8–centre bonding ................................. 184
13-8 (c)
x
(SN) : Polymerized Pauling “3-electron bonds” and
Polymerized 6-Electron 4-Centre bonding units ......................... 185
13-9 Paramagnetic “Increased-Valence” Structures ....................................... 186
References ...................................................................................................... 187
13-10 Addendum Chapter 13 .......................................................................... 189
S 2 N 2 Polymerization and Electron Conduction in the (SN) x Polymer ..... 189
Chapter 14 Delocalization of a Lone-Pair Electron into a Vacant
Antibonding Orbital:
Molecular Orbital Theory and Atomic Valencies .......... 191
14-1 Delocalization of a Lone-Pair Electron into a Vacant Antibonding
Orbital ................................................................................................. 191
14-2 Approximate Molecular Orbital Theory for 4-Electron 3-Centre
Bonding Units ...................................................................................... 195
14-3 Atomic Valencies for “Increased-Valence” Structures ........................... 197
References ...................................................................................................... 201
Addendum Chapter 14 .................................................................................... 202
Chapter 15 Slater Determinants and Wave-Functions for
“Increased-Valence” Structures..................................... 205
15-1 “Increased-Valence” Wave-Functions for 4-Electron 3-Centre and
6-Electron 4-Centre Bonding Units ....................................................... 205
15-2 Spin Degeneracy and Wave-Functions for “Increased-Valence”
Structures ............................................................................................. 208
Chapter 16 Classical Valence-Bond Structures and
Quinquevalent Nitrogen Atoms ..................................... 211
References ...................................................................................................... 217
Addendum Chapter 16 .................................................................................... 217
Chapter 17 Some Tetrahedral Molecules and d π – p π Bonding
for some Sulphur Compounds ....................................... 219
17-1 d-Orbitals as Polarization and Hybridization Functions ......................... 219
17-2 F 2 SO, F 2 SS, and (CH 3 ) 2 SO ................................................................... 221
17-3 F 3 NO, (CH 3 ) 3 NO, F 3 SN, and FSN ........................................................ 222
17-4 Sulphones XYSO 2 ................................................................................ 225
17-5
34
NO ,
34
PO and F 3 PO .......................................................................... 227
“Increased-Valence” Structures,