The title compounds, C14H12O, (I), and C15H11BrO2, (II), were prepared and characterized as part of our studies of potential new photo-acid generators. In (I), which crystallizes in the orthorhombic space group Pca21, compared to P21/n for the previously known monoclinic polymorph [Cornella & Martin (2013). Org. Lett. 15, 6298-6301], the dihedral angle between the aromatic rings is 4.35 (6)° and the OH group is disordered over two sites in a 0.795 (3):0.205 (3) ratio. In the crystal of (I), molecules are linked by O-H...[pi] interactions involving both the major and minor -OH disorder components, generating  chains as part of the herringbone packing motif. The asymmetric unit of (II) contains two molecules with similar conformations (weighted r.m.s. overlay fit = 0.183 Å). In the crystal of (II), both molecules form carboxylate inversion dimers linked by pairs of O-H...O hydrogen bonds, generating R22(8) loops in each case. The dimers are linked by pairs of C-H...O hydrogen bonds to form  chains.
|Number of pages||5|
|Journal||Acta Crystallographica Section E: Crystallographic Communications|
|Publication status||Published - 1 Mar 2016|
- crystal structure
- cinnamic acid
- photo-acid generator
- O—H⋯π interactions