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

Abstract

In the crystal of the ortho­rhom­bic polymorph of compound (I), the mol­ecules are linked into chains by O—H⋯π inter­actions. In compound (II), carb­oxy­lic acid inversion dimers are observed; the dimers are linked into chains by C—H⋯O hydrogen bonds.

Photochemical Fragmentation of Irgacure PAG 103

“…Two of the degradation products and the stereochemistry of the starting material, were verified by X-ray single crystal structure determinations. This information is relevant because it helps to understand how acid is released from it and what structural features are important for this particularly because the design of photoacid releasing compounds − remains a topical subject both academically and commercially. − Compound 1 was irradiated with a low power 6 W UV lamp at 254 nm in an immersion well. This setup is user friendly and is suitable for undergraduates; it is air cooled by a fume hood fan and it avoids a powerful 400 W medium pressure mercury lamp inside an immersion well containing a large volume of flammable solvent.…”