π-Conjugated Molecules Containing Tetrathiafulvalene and Benzo[b]phosphole Oxide: Synthesis, Structure, and Electrochemical and Optical Properties

Three new pi-conjugated molecules containing a tetrathiafulvalene (TTF) unit and a benzo[b]phosphole oxide unit were successfully synthesized. X-ray structural analysis revealed that the benzo[b]phosphole oxide unit exhibits high planarity, whereas the TTF unit adopts a bending structure. Electrochemical analysis by cyclic voltammetry revealed two pairs of redox waves derived from the TTF site. The absorption bands were almost identical to those of the TTF and benzo[b]phosphole oxide moieties, although their fluorescence was significantly quenched by intramolecular electron transfer.

Automated summary

Three new pi-conjugated molecules containing a TTF unit and a benzo[b]phosphole oxide unit were successfully synthesized. X-ray structural analysis showed high planarity of the benzo[b]phosphole oxide unit and a bending structure of the TTF unit. Cyclic voltammetry revealed two pairs of redox waves from the TTF site.