A new fluorescence-switch based on supermolecular dyad with (tetraphenylporphyrinato) zinc(II) and tetrathiafulvalene units

A supermolecular dyad based on zinc porphyrin has been constructed by axial coordination to a pyridine-appended tetrathiafulvalene (TTF). This dyad has been characterized by optical absorption, fluorescent spectra, computational and electrochemical methods. The estimated binding constant (K), fluorescence quenching effect and the electrochemical behaviors not only revealed the stable complexation but also suggested the existence of the intra-supermolecular interactions between the porphyrin and TTF units. As the fluorescence of this dyad could be modulated by sequential oxidation and reduction of the TTF unit, a new redox fluorescence switch based on this supermolecular dyad has been constructed.