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Schematic representation showing the twisting of the different molecular fragments constituting compounds D1 and D2. Averaged values of the C1C2C3C4, C5C6C7C8, and C9C10N1C11 dihedral angles are given for the optimized S0 and S1 geometries of D1 and D2. When the dihedral angle in non-polar solvents differs significantly, the value is reported in parenthesis. In order to better identify the dihedral angels, the same color code presented in Scheme 1 was adopted.
