title: Two new polymorphs of diphenyl(4-pyridyl)methyl methacrylate.
abstract: The title compound (D4PyMA), C(22)H(19)NO(2), exhibits polymorphism after crystallization by slow evaporation from a binary mixture of chloroform and hexane. Long needle-like crystals have an orthorhombic structure (space group Fdd2), with one molecule in the asymmetric unit, while small tablet-like crystals exhibit a monoclinic crystal structure (space group P2(1)/n), in which two independent but chemically identical molecules comprise the asymmetric unit. The bond lengths and angles are normal, while the torsion angles around the -C-O- bond linking the diphenyl(4-pyridyl)methyl and methacrylate groups show the flexibility of the molecule by way of packing effects. The two polymorphs both contain weak C-H...pi and C-H...O/N contacts but have different conformations.
authors.affiliation: Laboratory of Polymer Chemistry, Materials Science Center, Groningen University, Nijenborgh 4, NL-9747 AG Groningen, The Netherlands.
authors.forename: Gerrit Gobius
authors.initials: GG
authors.lastname: du Sart
authors.forename: Gert O R Alberda
authors.initials: GO
authors.lastname: van Ekenstein
authors.forename: Auke
authors.initials: A
authors.lastname: Meetsma
authors.forename: Gerrit Ten
authors.initials: GT
authors.lastname: Brinke