I need to explain magnetic property while changing the alkylation of various pyridine ligands in cu(II) complex. Please suggest the key role of parameters for the above concept.
Please find as attachment the equs for (mu)eff for Td and Oh complexes of Cu(II), refs and the dependencies. The enthalpy you may find using the common relationship that the free Gibbs energy has been given by -SdT-MdB (M-integral of the magnetisation towards the whole sample, B-external magnetic field). You may find zhis relationship anywhere. But what is R - universal gas constant? You would like to confirm the well known value using the relationship for the magnetic heat capacity!?