Computational design of benzothiazole-derived push?pull dyes with high molecular quadratic hyperpolarizabilitiesElectronic supplementary information (ESI) available: Table S1: Heats of formation and relevant torsional angles (AM1) and ZINDO (gas phase and dioxane solution) dipole moments and ?vec-values for different conformations of compounds 1?51. Table S2: B3LYP/6-31G* energies, zero point energy corrections (au), torsional angles, DRRPA-HF/6-31G* and ZINDO (gas phase) hyperpolarizabilities for different conformations. Table S3: Contributions (two-state model, other configurations) to ZINDO gas phase hyperpolarizabilities (B3LYP/6-31G* lowest energy conformation). Table S4: Orbital energies and coefficients (2pz, 3pz) of the two highest