This database collects all the computations reported in the paper. This database contains three main folders: CT-analysis, QDYN and dihedral. CT-analysis contains two subfolders: GEO-OPT and SA-CASSCF. The GEO-OPT folder contains three subfolders for the three studied systems: BDT-TDO, fluorene-TDO and EDOT-TDO. In the BDT-TDO subfolder are found the DFT geometry optimizations of the GS singlet (GS), GS quintuplet (Q) and lowest excited singlet (S1). Each folder contains the 8 substituted derivatives: geo, geoAOH, geoA2OH, geoACN, geoA2CN, geoDOH, geoDOH_ACN, geoDOH_A2CN. The chemical structure of the substituted derivatives is shown in Figure 2 of the paper. For fluorene-TDO and EDOT-TDO only the GS geometry was evaluated. These computations were done with Gaussian09. The SA-CASSCF folder contains three subfolders for the three studied systems: BDT-TDO, fluorene-TDO and EDOT-TDO. In the BDT-TDO subfolder are found three subfolders corresponding to the GS, Q and S1 geometries. In the fluorene-TDO and EDOT-TDO folders only the GS geometry was considered. For each geometry and system, the subfolder contains the input and output of: scf: gives the HF orbitals. cas1: gives the 10 lowest singlet states with SA10-CASSCF(12,12). pt2: gives the CASPT2 energy of these states. rassi: computes the transition densities for the Theodore analysis. All these computations were done with openMOLCAS. dens_ana.in file: Theodore input. OmFrag.txt and ehFrag.txt files: Theodore outputs. geom.xyz: geometry of the system. QDYN contains 6 subfolders: BDT-DPP, BDT-TDO-1, BDT-TDO-2, BDT-TDO-4, BDT-TDO-6, phenylene-DPP. Each for the 6 studied systems with quantum dynamics. In each folder there are 3 subfolders: VNM contains the vibrational normal modes (DFT frequencies with Gaussian09). SA-CASSCF contains 3 subfolders GS: contains the SA-CASSCF orbitals and diabatization at the GS geometry. 003: contains the SA-CASSCF and diabatization at displaced geometries along all normal modes at: positive: Q=0.03 negative: Q=-0.03 scan: contains the SA-CASSCF and diabatization for 10 selected normal modes at: m15: Q=-1.5 m1: Q=-1.0 m05: Q=-0.5 0.5: Q=0.5 1: Q=1.0 15: Q=1.5 All these computations were done with GAMESS. MCTDH collects the wavepacket propagations and contain: MCTDH input: im_14_l.inp Hamiltonian: im_14_l.op MCTDH output: output In some cases, subfolders are provided including dynamics with modifications in the Hamiltonian as: no-direct: the interstate coupling between the S1 and TT state is neglected. no-CT3: a specific excited state (as CT3) is removed. mod1, mod2: the energy of an excited state has been manually modified. The dihedral folder contains four subfolders collecting the computations of the study of the dihedral angle in 4 systems: BDT-DPP, BDT-TDO-1, BDT-TDO-8, phenylene-DPP For each system the folder contains two subfolders: DFT and SA-CASSCF. DFT contains the optimization of the structure at 10 contrained dihedrals between 0 and 180 degrees. SA-CASSCF contains 10 subfolders for each dihedral with the input and output of: scf: gives the HF orbitals. cas1: gives the 10 lowest singlet states with SA10-CASSCF(12,12). pt2: gives the CASPT2 energy of these states. rassi: computes the transition densities for the Theodore analysis. All these computations were done with openMOLCAS. dens_ana.in file: Theodore input. OmFrag.txt and ehFrag.txt files: Theodore outputs. geom.xyz: geometry of the system.