Stacking of hydrazone-bridged linear tetrathiafulvalene radical cations

Four compounds M1, M2, M3, M4, and one polymer P1 containing tetrathiafulvalene (TTF) units have been synthesized by the condensation of TTF-derived aldehyde and acylhydrazine precursors. UV-vis absorption and electron paramagnetic resonance spectroscopy as well as scanning electron microscopy reveal that the TTF+ stacking of the polymer is considerably enhanced compared to that of the shorter compounds in polar solvents.