Novel 1- and 9-aminoanthracene/3-aminobenzanthrone bichromophores exhibiting through-bond excitation energy transfer

• 1-/9-Aminoanthracenes-triazine-3-aminobenzanthrone bichromophores were prepared.
• Structure-photophysical properties-solvent polarity-qF relationships were studied.
• Polar CT state connected with electron transfer from donor to acceptor was found.
• The deactivation process of the excited fluorescent state is influenced by CT.
• Electron transfer mediated by through-bond mechanism is dominating in EET.

New 1/9- aminoanthracene-triazine-3-aminobenzanthrone bichromophores for the study of excitation energy transfer were synthesized and characterised. Absorption and emission spectra and fluorescence quantum yields were measured. Equilibrium ground state conformations and singlet electronic excited states characteristics were calculated at semiempirical level. A decrease of qF in polar solvents may be explained by the CT state connected with electron transfer from the HOMO localized on the donor to the LUMO spread over the acceptor. A highly efficient energy transfer mediated by through-bond mechanism was observed for all compounds.

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