ester carbonyl group (an oxetane). The involvement of plural exciplex intermediates for these phenomena was proposed on the basis of the temperature and solvent dependence of quantum efficiencies of fluorescence and cycloadditions as well as of the effects of quenchers of exciplex intermediates.
                                    (E)-3-(4-Methoxyphenyl)-3-pentenyl 6-cyano-9-phenanthrenecarboxylate 以及相应的 9-phenanthrenecarboxylate 表现出激发态发射,并产生 [2+2] 与
菲 9 双键的光环加合物, 10键(
环丁烷)和酯羰基(氧杂
环丁烷)。基于荧光和环加成的量子效率的温度和溶剂依赖性以及激基复合物中间体的猝灭剂的影响,提出了多个激基复合物中间体对这些现象的参与。