Novel Chromatic Transitions of Azobenzene‐Functionalized Polydiacetylene Aggregates in 1,2‐Dichlorobenzene Solution

Herein, we prepare three azobenzene-functionalized polydiacetylene (PDA) aggregates in 1,2-dichlorobenzene solution with reversible thermochromic and novel photo-induced chromatic behavior. The influence of chemical structural variation on the chromatic transition properties of the PDAs aggregates has been explored in detail by in situ FTIR spectroscopic analyses. The links between chromatic transitions and the molecular structure of PDA aggregates has been established. The results demonstrate that suitable head group interactions and alkyl side chain lengths are both essential for the sensitivity and reversibility of the thermochromic and photochromic properties of PDAs aggregates in solution.