Comments on 6-Electron 4-Centre Bonding Units

Two unique molecules are present in the unit cell, one of which is disordered. The data presented are from the nondisordered molecule. The estimated standard deviations may be severely underestimated. 

Two increased-valence bonding nnits of the general type (7) are present in the increased-valence structures of (6) one for the six -electrons and one for six 7c -I- a - electrons The relevant atomic orbitals are displayed in Fig. 13-2 for the cis isomer. The latter type of increased-valence bonding unit is also present in structures (2) and (4) for the six x -i- a - electrons of and N2O4. In this 

Chapter 13 Increased-Valence Structures for A -Centre Bonding Units 

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