Explain why pie to pie*transition are the most spectra .explain
promotion of an electron from a π-bonding orbital to an antibonding π orbital * is denoted as a π → π * transition. These transitions involve moving an electron from a bonding \*pi\( orbital to an antibonding \(\pi^*\( orbital. They tend to have molar absorptivities on the order of 10,000 and undergo a red shift with solvent interactions (a shift to lower energy and longer wavelengths). This could either be due to a raising of the ground state energy or lowering of the excited state energy. If the excited state is polar, then it will be solvent stabilized, thus lowering its energy and the energy of the transition. So pi to pi transition are most.