by the addition of a substituent to it, For example, I am studying a half sandwich structure where the "table" is an Cp ligand. I am comparing the structure of the complex to that of its identical version except with an additional substituent attached to the Cp ring ligand. My question is will the complexes be the same or different structure. As I know the colour of complexes is dependent on the crystal field splitting on the d orbitals and I know the greater the field strength of the ligand the greater the splitting. So will I be changing the ligand field strength of Cp (cyclopentadiene) by adding a substituent to it? if so how does that happen?