Oxalic acid/phenols and oxalic acid/cholesterol co-crystals: A solid state13C CPMAS NMR study

摘要

The structures of the crystals obtained by mixing oxalic acid (1) and five hydroxy derivatives, phenol (2a), p-cresol (2b), hydroquinone (2c), β-naphthol (2d), and cholesterol (2e) have been studied by 13C CPMAS NMR. It has been proved that they are co-crystals of defined stoichiometry (oxalic/hydroxy derivative) 1:2 (1/2a, 1/2b, 1/2e), 2:2 (1/2c), and 1:4 (1/2d). ©ARKAT-USA, Inc.