Circular dichroism of palladium(II) and platinum(II) diamine complexes

An identifiable relationship exists between the absolute configuration of chiral diamine ligands and the circular dichroism of their complexes with palladium(II) and platinum(II). Complexes which contain simple C-substituted diamines with the R-absolute configuration show positive circular dichroism in the region associated with the 1A1g → 1Eg transition, both in solution and the solid state. There is no general consistency in the sign of the 1A1g → 1A2g transition, and only for solution does the sign of the net circular dichroism show a correlation with the absolute configuration of the ligands.