title: Weak intermolecular interactions in 11-chloro-2,3,4,5-tetrahydro-1H-cyclohepta[b]quinoline.
abstract: The title compound, C(14)H(14)ClN, is a chloro analogue of tacrine, an acetylcholinesterase inhibitor. The compound comprises a seven-membered alicyclic ring whose CH donor groups are engaged in extensive intermolecular interactions. The important feature of this crystal structure is that, regardless of the presence of two typical hydrogen-bonding acceptors, viz. chlorine and nitrogen, the corresponding C-H...Cl and C-H...N interactions take no significant role in crystal stabilization. The molecules form dimers through pi-pi interactions with an interplanar distance between interacting pyridine rings of 3.576 (1) A. Within the dimers, the molecules are additionally interconnected by four C-H...pi interactions. The dimers arrange into regular columns via further intermolecular C-H...pi interactions.
authors.affiliation: Vinca Institute of Nuclear Sciences, Laboratory of Theoretical Physics and Condensed Matter Physics, PO Box 522, 11001 Belgrade, Republic of Serbia. snovak@vin.bg.ac.yu
authors.forename: Sladjana B
authors.initials: SB
authors.lastname: Novaković
authors.forename: Maja D
authors.initials: MD
authors.lastname: Vitorović-Todorović
authors.forename: Goran A
authors.initials: GA
authors.lastname: Bogdanović
authors.forename: Branko J
authors.initials: BJ
authors.lastname: Drakulić