How to form square planar crystal field
.Start from octahedral and remove ligands on the z axis
.Ligands on z axis=further away all orbitals with a z component lower in energy further away so less repulsion
.mantain energy dx2-y2 and dxy increase in energy
.ligands on z axes removed dz2 drops energy so stabilized
.dx2- y2 high in energy as ligands directly pointed at all lobes
What does low spin do
Pair electrons
What does high spin do
Maximise unpaired electrons
How to determine if it’s high or low spin
.If change in o greater than p (strong field) and low spin
.if change in o less than p(weak field) and high spin
Are tetrehedral complexes high or low spin
High spin
What is delta o influenced by r
Charge on metal- higher charge greater electrostatic interactions larger delta o
.ligands.
.nature of metal-delta o larger for 2nd and 3rd row metals and less pairing energy
Examples of strong and weak field ligands
Strong field ligand=CN- ,CO,NH3,H2O
Weak field-Br- ,F-,SCN-
.electron’s and Lone pairs like halogens=weak field
