Synthesis, structures and properties of new organic donors connecting to a TEMPO radical through a pyrrolidine ring

We report the synthesis, structures and physical properties of new TEMPO-containing electron donors in which a TEMPO radical part connects to the EDT-TTF (1) or EDO-TTF (2) skeletons through a pyrrolidine ring. The donors are paramagnetic and showed a slight antiferromagnetic interaction at low temperature region. The CV measurement showed two pairs of reversible redox waves originated from the TTF part and one oxidation wave from the TEMPO radical part. Physical properties of the iodine complex of 1 are also presented.