A Covalent Bonding Model - Embracing Molecular Orbital Theory

2 A Covalent Bonding Model - Embracing Molecular Orbital Theory 

A molecular orbital diagram for F3B—NH3, reporting only the orbital interaction of the lowest unoccupied molecular orbital (LUMO) on the precursor molecule BF3 and the highest occupied molecular orbital (HOMO) on the precursor molecule NH3. Only if there is useful overlap of the orbital contributions from each precursor are the new orbitals formed. 

What has been done above for the octahedral geometry can likewise be applied to other shapes, but it is not the intent to labour the point by pursuing these here. What we have established is another viable model for dealing with metal complexes, albeit based on simple t-bonding concepts we will return to look beyond this level later. 

Orbital orientation as a contributor to effective molecular orbital formation effective -orbital interaction versus ineffective djy-orbital interaction. The circles represent ligand orbitals located equidistant from the metal centre in each case. 

---