 As shown in figure 1, the molecular orbital diagram of [(n-C4H9)4N]2Pt(CN)4 reveals MLCT into the antibonding π* orbitals of cyanide.The ground state is diamagnetic (thereby eliminating any C-terms) and the LUMO is the a2u.The dipole-allowed MLCT transitions are a1g-a2u and eg-a2u.