title: Crystal structure of 7,8-benzocoumarin-4-acetic acid.
abstract: The fused-ring system in the title compound [systematic name: 2-(2-oxo-2H-benzo[h]chromen-4-yl)acetic acid], C15H10O4, is almost planar (r.m.s. deviation = 0.031 Å) and the Car-C-C=O (ar = aromatic) torsion angle for the side chain is -134.4 (3)°. In the crystal, mol-ecules are linked by O-H⋯O hydrogen bonds, generating [100] C(8) chains, where the acceptor atom is the exocyclic O atom of the fused-ring system. The packing is consolidated by a very weak C-H⋯O hydrogen bond to the same acceptor atom. Together, these inter-actions lead to undulating (001) layers in the crystal.
authors.affiliation: Department of Physics, Sri Krishna Rajendra Silver Jubilee Institute of Technology, Bangalore 560 001, Karnataka, India.
authors.forename: R Ranga
authors.initials: RR
authors.lastname: Swamy
authors.affiliation: Department of Physics, Govt. College for Women, Kolar 563 101, Karnataka, India.
authors.forename: Ramakrishna
authors.initials: R
authors.lastname: Gowda
authors.affiliation: Department of Physics, Govt. College for Women, Mandya 571 401, India.
authors.forename: K V Arjuna
authors.initials: KV
authors.lastname: Gowda
authors.affiliation: Department of Chemistry, P.C. Jabin Science College, Hubli 580 031, Karnataka, India.
authors.forename: Mahantesha
authors.initials: M
authors.lastname: Basanagouda
keywords: acetic acid; coumarin; crystal structure; hydrogen bonding