The shape and size of the supramolecular polymers formed by sumanene in a solution were then investigated by small-angle X-ray scattering (SAXS). As shown in Figure , the broad peaks, i.e, multi components, were observed at q = 4-7 nm -1 in an MCH (2.07 mM, DP = 6.7) solution of sumanene. The appropriate model was used and it was assumed that the sumanene supramolecular polymer is cylindrical (see S12 in the SI). The results were reasonably fitted to a sum of tetrameric and pentameric polymer functions, as shown in Figure . Therefore, these SAXS experiments and spectroscopic measurements suggest that sumanene forms tetrameric to septameric supramolecular polymers in MCH-saturated solutions. The construction of solution-state sumanene supramolecular polymers prompted us to examine the external stimuli-responsive dynamic control. Temperature control was tested in MCH. As shown in Figure , no change in the extinction coefficient was observed in the temperature range from 0 to 60 °C, suggesting that the effect of temperature on the formation of sumanene supramolecular polymers is negligible in the measured temperature range. This may indicate thermodynamic stability of the MCH-assisted supramolecular polymers.