Photoreactive Organic Thin Films by Zouheir Sekkat, Wolfgang Knoll

By Zouheir Sekkat, Wolfgang Knoll

Wolfgang Knoll is a former listing of Polymer study on the Max Planck Institute. he's super good understand for his study during this quarter. Zouheir Sekkat was once a Postdoctoral researcher at Max Planck operating lower than Professor Knoll. With Knoll's involvement, we will be convinced that the easiest humans during this box might be contributing to the reference.

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The dotted line is the extrapolated Z-spectrum. ) triplet split of (n,K*) states is greater than that of (n,7t*) states. Moreover, a twist which lowers the energy and may be the reason that no triplet-triplet absorption is observed is inferred in the triplet state. The lifetime of the Z-isomers of aminoazobenzene-type molecules is generally short. 12). The azo group, whose n-electrons are orthogonal to the 7c-system, is more basic than the amino group, whose n-electrons are part of the TC-system.

Data from refer- Z —» E isomerization yield is nearly temperature-independent (Figure 1,10) or increases at low temperature, with only a small difference for excitation to the two lowest-excited states. So obviously, the E —> Z photoisomerization— after irradiation to the (n,rc*) state as well as the Z —> E isomerization— proceeds even at low temperature and in frozen solvents. 1490 that is temperature independent down to 4 K. 111 Thus, azobenzene photoisomerization cannot be frozen out. 112 They found an increase of E -> Z isomerization but a decrease of Z —> E isomerization when solvents with high dielectric constant are used.

If these AD-diagrams (absorbance difference) are linear, then exactly one independent reaction is present. 4, parts A and B). • s = 2: If the AD-diagrams are nonlinear, absorbance changes at three arbitrary wavelengths are selected. The changes at two wavelengths are divided by the absorbance change at the third and these absorbance difference quotients are plotted in an ADQ2-diagram. 5-10"' Einstein cm"2 s"1: two intervals of 5 s, five of 10 s, three of 20 s and a period of I h 25 min for reaching the pss.

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