Abstract
AbstractHerein, a hetero(S,N)‐quintuple [9]helicene (SNQ9H) molecule with an azacorannulene core was synthesized, currently representing the highest hetero‐helicene reported in the field of multiple [n]helicenes. X‐ray crystallography indicated thatSNQ9Hincludes not only a propeller‐shaped conformerSNQ9H‐1, but also an unforeseen quasi‐propeller‐shaped conformerSNQ9H‐2. Different conformers were observed for the first time in multiple [n≥9]helicenes, likely owing to the doping of heteroatomic sulfurs in the helical skeletons. Remarkably, the ratio ofSNQ9H‐1toSNQ9H‐2can be regulated in situ by the reaction temperature. Experimental studies on the photophysical and redox properties ofSNQ9Hand theoretical calculations clearly demonstrated that the electronic structures ofSNQ9Hdepend on their molecular conformations. The strategy of introducing heteroatomic sulfurs into the helical skeleton may be useful in constructing various conformers of higher multiple [n]helicenes in the future.
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