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  • Title: Pseudomerohedral twinning, pseudosymmetry and complex hydrogen-bonded sheets in 2-methoxy-4-(pyrrolo[1,2-a]quinoxalin-4-yl)phenol.
    Author: Castillo JC, Abonía R, Cobo J, Glidewell C.
    Journal: Acta Crystallogr C; 2010 Aug; 66(Pt 8):o385-8. PubMed ID: 20679712.
    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.
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