title: Crystal structure of 3-[2-(4-methyl-phen-yl)ethyn-yl]-2H-chromen-2-one.
abstract: The coumarin ring system in the title asymmetric alkyne, C18H12O2, is approximately planar (r.m.s. deviation of the 11 non-H atoms = 0.048 Å), and is inclined with respect to the methyl-benzene ring, forming a dihedral angle of 33.68 (4)°. In the crystal, supra-molecular zigzag chains along the c-axis direction are formed via weak C-H⋯O hydrogen bonds, and these are connected into double layers via weak C-H⋯π inter-actions; these stack along the a axis.
authors: Departmento de Física, Universidade Federal de São Carlos, 13565-905 São Carlos, SP, Brazil.
authors: Ignez
authors: I
authors: Caracelli
authors: Departmento de Física, Universidade Federal de São Carlos, 13565-905 São Carlos, SP, Brazil.
authors: Stella H
authors: SH
authors: Maganhi
authors: Departamento de Farmácia, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, 05508-900 São Paulo-SP, Brazil.
authors: Hélio A
authors: HA
authors: Stefani
authors: Departamento de Farmácia, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, 05508-900 São Paulo-SP, Brazil.
authors: Karina
authors: K
authors: Gueogjian
authors: Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia.
authors: Edward R T
authors: ER
authors: Tiekink
keywords: C—H⋯π inter­actions; asymmetric alkyne; coumarins; crystal structure; hydrogen bonding