title: 2-(Naphthalen-2-yl)azulene.
abstract: In the title compound, C(20)H(14), a naphthalene ring system is linked at the 2-position to the 2-C atom of the five-membered ring of an azulene unit. The compound crystallizes with two reasonably similar mol-ecules in the asymmetric unit. Neither mol-ecule is perfectly planar: the r.m.s. deviations from the best fit planes through all non-H atoms are 0.092 and 0.091 Å for the two mol-ecules. The dihedral angle between the mol-ecular planes is 49.60 (4)°. The naphthalene and azulene ring systems are inclined at dihedral angles of 6.54 (12) and 5.68 (12)° in the two mol-ecules. The crystal structure exhibits two sets of parallel layers, a typical edge-to-face herringbone packing arrangement. The structure is stabilized by an extensive series of weak C-H⋯π inter-actions.
authors.affiliation: State Key Laboratory of Applied Organic Chemistry and College of Chemistry and, Chemical Engineering, Lanzhou University, Lanzhou, Gansu, 730000, People's Republic of China.
authors.forename: Jian
authors.initials: J
authors.lastname: Ye
authors.forename: Zi-Fa
authors.initials: ZF
authors.lastname: Shi
authors.forename: Chun-Lin
authors.initials: CL
authors.lastname: Sun
authors.forename: Zhu-Guo
authors.initials: ZG
authors.lastname: Xu
authors.forename: Hao-Li
authors.initials: HL
authors.lastname: Zhang