Investigations of new potential photo-acid generators: crystal structures of 2-[(<i>E</i>)-2-phenylethenyl]phenol (orthorhombic polymorph) and (2<i>E</i>)-3-(2-bromophenyl)-2-phenylprop-2-enoic acid

W2287199380 · 수집 2026-10-04 18:12:23

T12570 Photopolymerization techniques and applications

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The title compounds, C 14 H 12 O, (I), and C 15 H 11 BrO 2 , (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 Pca 2 1 , compared to P 2 1 / n for the previously known monoclinic polymorph [Cornella &amp; 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...π interactions involving both the major and minor –OH disorder components, generating [001] 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 R 2 2 (8) loops in each case. The dimers are linked by pairs of C—H...O hydrogen bonds to form [010] chains.

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