Spektroskopische Untersuchung einiger α,β‐ungesättigter cyclischer Ketone

The results of the spectroscopic investigation of the steroidal enones 1–6 can be summarized as follows: Direct absorption and phosphorescence excitation techniques have been used to locate the 3(n,π*) states, and in each case it has been found to be the second triplet state. The lowest excited state in each case is assigned as 3(π,π*) state. The diffuseness in the phosphorescence emission from the 3(π,π*) states is attributed to a large change in the molecular geometry upon excitation (probably to a non‐planar configuration). The diffuseness in the S→ Tn,π* absorption is correspondingly attributed to interaction between the 3(n,π*) and 3(π,π*) states. A summary of the energy levels for these compounds is given in Fig. 4.