Photoreaction of 7-Me2-germanorbornadiene to tetraphenylnaphthalene

Re-examination of 7,7′-dimethyl-7-germanorbornadiene photocleavage in solution and in organic glasses

“…In [22], the overlap of the T-T absorption of TPN and the absorption of dimethylgermylene has not allowed to reveal the latter. Figure 4 illustrates this situation.…”

“…This absorption represents the asymmetric absorption band with the maximum of k max & 480 nm and agrees well with [26]. The transient absorption spectrum of GeNB 1 and the T-T absorption of TPN 2 has been produced by XeCl excimer laser flash photolysis (k ex = 308 nm) in methylcyclohexane [22]. This additional absorption 3 is the result of the subtraction of these spectra Figure 5 presents the dependence of the observed rate constant for decay of the intermediate absorption on the initial optical density at 350 nm and at 470 nm in nhexane.…”

“…Figure 4 illustrates this situation. In the study [22], the authors reported the spectra of the T-T absorption of 1,2,3,4-tetraphenylnaphthalene and the transient absorption. The subtraction of these spectra exhibits the difference absorption.…”

“…The photocleavage of GeNB in liquid solutions has been investigated by means of flash photolysis previously [5,22,26]. In this section, the data of these references will be repeated and supplemented.…”

“…The photocleavage of GeNB in low-temperature organic glasses and in liquid solutions has been previously investigated [5,9,13,14,22], but large differences in the interpretation of experimental data continue to exist.…”