Selective synthesis, reactivity and luminescence of unsymmetrical bis-cyclometalated Pt( iv ) complexes

LC excited states localized on the cyclometalated ligand with the lowest π-π* transition energy. The combined photophysical data and computational results substantiate a variable degree of MLCT admixture into the emitting state depending on the atom trans to the metalated carbon of the chromophoric ligand (Cl or N), which has an appreciable effect on the characteristics of the observed luminescence.