Optical properties of TM complexes 1. As one progresses up the periodic table, optical electronegativities, like standard electronegativities increase. Because of this, a greater amount of energy is needed to transfer the electron from the ligand to the metal, hence an increase in energy of the CT band. The absorption is of very low energy so a CT is not expected. Circular dichroisim is a characteristic of chiral molecules in which the different enantiomers exhibit different spectra for left and right polarized light.
Circular dichroism is useful in the differentiation of geometric and optical isomers.
Type I proteins are intensely blue colored, while Type II proteins are weakly colored, and Type III proteins are characterized by an absorption band in the 300-nm region and the absence of an EPR spectrum. Both Type I and Type II proteins give EPR spectra. Given only this information , make educated guesses as to the charge on the Cu, the number of d electrons, and the types of ligands that might be expected for each of these proteins. Give your reasoning. Same ligand possibilities as Type I, but should be different since the absorptions are different.