(E)-7-(Pyren-1-yl)hept-6-enoic acid

The title compound, C(23)H(20)O(2), is a precursor of a pyrene-based supra­molecular element for non-covalent attachment to a carbon nanotube. The asymmetric unit contains three independent mol­ecules. The carb­oxy­lic acid group in each of these mol­ecules serves as an inter­molecular hydrogen-bond donor and acceptor, generating the commonly observed double O—H⋯O hydrogen-bond motif in an eight-membered ring. Weaker C—H⋯O, π–π [centroid–centroid distance = 3.968 (4) Å] and C—H⋯π inter­actions are also found in the crystal structure.