title: 1,2-Dihydro-9H-carbazole-4(3H)-thione.
abstract: The crystal structure of the title compound, C(12)H(11)NS, features parallel chains of alternating N-H⋯S hydrogen-bonded mirror-image conformers along [10[Formula: see text]]. The mol-ecular conformation is that of an envelope, with all of the framework atoms except one close to a mean plane (rms deviation 0.054 Å); one C atom of the cyclo-hexene-thione ring forms the envelope flap, which makes a dihedral angle of 48.6 (1)° with the rest of the mol-ecule. There is a π-π* inter-action between pairs of enanti-omers in adjacent chains; the distance between parallel planes is 3.466 (1) Å.
authors.affiliation: Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803, USA.
authors.forename: W Adam
authors.initials: WA
authors.lastname: Phelan
authors.forename: Maria
authors.initials: M
authors.lastname: Ngu-Schwemlein
authors.forename: Frank R
authors.initials: FR
authors.lastname: Fronczek
authors.forename: Mark L
authors.initials: ML
authors.lastname: McLaughlin
authors.forename: Steven F
authors.initials: SF
authors.lastname: Watkins