To investigate the behaviour of the radical, a variable temperature experiment was performed. The intensity of the EPR signal was found to intensify gradually with increasing temperature suggesting the un-stacking of the stacked state (Figure ). The stacking behaviours was also monitored through variable temperature UV-vis spectroscopy for the radical anion 1c .-(10M in DMF) which also demonstrated the un-staking behaviour. Thus, the absorption spectra of 1c .-exhibited a gradual shift in the absorption maxima as the temperature of the solution was increased gradually from 218 K to 263 K (Figure ).