Crystal structure of a new polymorph of 3-acetyl-8-meth-oxy-2H-chromen-2-one.

ABSTRACT: A new polymorphic form of the title compound, C₁₂H₁₀O₄, is described in the ortho-rhom-bic space group Pbca and Z = 8, as compared to polymorph I, which crystallizes in the monoclinic space group C2/c and Z = 8 [Li et al. (2012). Chin. J. Struct. Chem. 31, 1003-1007.]. In polymorph II, the coumarin ring system is almost planar (r.m.s. deviation = 0.00129 Å). In the crystal, mol-ecules are connected by Csp ³-H⋯O and C_ar-H⋯O hydrogen bonds, forming mol-ecular sheets linked into zigzag shaped layers along the b-axis direction. The three-dimensional lattice is assembled through stacking of the zigzag layers by π-π inter-actions with a centroid-to-centroid distance of 3.6

SUBMITTER: Gonzalez-Carrillo G 

PROVIDER: S-EPMC6895931 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature