title: Pseudomerohedral twinning, pseudosymmetry and complex hydrogen-bonded sheets in 2-methoxy-4-(pyrrolo[1,2-a]quinoxalin-4-yl)phenol.
abstract: The title compound, C(18)H(14)N(2)O(2), crystallizes as a nonmerohedral twin, but the structure can be satisfactorily refined as a merohedral twin, in which a monoclinic unit cell with a cell angle beta close to 90 degrees emulates a metrically orthorhombic cell. The two molecules in the asymmetric unit are very similar in structure and they are related by an approximate pseudo-screw axis. The molecules are linked into complex sheets by a combination of two O-H...N hydrogen bonds and four C-H...O hydrogen bonds.
authors.affiliation: Departamento de Química, Universidad de Valle, AA 25360 Cali, Colombia.
authors.forename: Juan C
authors.initials: JC
authors.lastname: Castillo
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Abonía
authors.forename: Justo
authors.initials: J
authors.lastname: Cobo
authors.forename: Christopher
authors.initials: C
authors.lastname: Glidewell
mesh_terms: D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D015394:Molecular Structure; D011810:Quinoxalines / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: C552262:2-methoxy-4-(pyrrolo(1,2-a)quinoxalin-4-yl)phenol; D011810:Quinoxalines