gives rise to a IR band at 2202 cm -1 , as expected, however configuration C3 also shows a IR band at 2202 cm -1 . Thus, we cannot resolve the C2 and C3 configurations based on the IR data. Likewise, the interaction strength for C1 and C3 configurations are similar, so the dynamics of F 4 TCNQ anion obtained from 2DES measurements cannot distinguish between these configurations. Considering that the weak experimental IR band at 2202 cm -1 is contributed by C2 and C3 configurations, the side-chain configuration C1 seems to be the dominant species. But it is likely that all the three geometries co-exist in precursor solutions.