Synthesis of PAT derivatives 1-3 followed the same route as published earlier from our group (see Supporting Information for details). Diversification at the 10-position was achieved by Suzuki cross coupling using a brominated anthracene thioether and different boronic acids as coupling partners. In this way electron rich dimethylaniline (PAT 1), trimethoxyphenyl (PAT 2), and n-hexyl (PAT 3) substituents could be introduced to modulate the solubility of the photoswitch structures. The characterization of the three different PAT structures was in fact strongly depending on their respective solubility. PAT 1 exhibited the lowest solubility and could not be dissolved at concentrations needed for NMR analysis in any solvent tested. However, its identity and configuration could be evidenced by mass spectrometry, IR and absorption spectroscopy, and by comparison of its switching behavior with PAT 2 and 3. PAT 2 displayed a much better solubility, which is even improved over the original mesitylene derivative 4. Therefore, the trimethoxyphenyl substituent is surprisingly effective in solubilizing the large p-extended PAT chromophore. PAT 3 also showed low solubility, however high-temperature NMR spectroscopy could be used to characterize its thermodynamically stable E isomeric state.