title: Concomitant polymorphs of 1,3-bis(3-fluorophenyl)urea.
abstract: Hydrogen bonding between urea functionalities is a common structural motif employed in crystal-engineering studies. Crystallization of 1,3-bis(3-fluorophenyl)urea, C13H10F2N2O, from many solvents yielded concomitant mixtures of at least two polymorphs. In the monoclinic form, one-dimensional chains of hydrogen-bonded urea molecules align in an antiparallel orientation, as is typical of many diphenylureas. In the orthorhombic form, one-dimensional chains of hydrogen-bonded urea molecules have a parallel orientation rarely observed in symmetrically substituted diphenylureas.
authors: Department of Chemistry, Georgetown University, 37th & O St. NW, Washington, DC 20057, USA.
authors: Christina A
authors: CA
authors: Capacci-Daniel
authors: Department of Chemistry, Georgetown University, 37th & O St. NW, Washington, DC 20057, USA.
authors: Jeffery A
authors: JA
authors: Bertke
authors: Department of Chemistry, Georgetown University, 37th & O St. NW, Washington, DC 20057, USA.
authors: Shoaleh
authors: S
authors: Dehghan
authors: Department of Chemistry, Georgetown University, 37th & O St. NW, Washington, DC 20057, USA.
authors: Rupa
authors: R
authors: Hiremath-Darji
authors: Department of Chemistry, Georgetown University, 37th & O St. NW, Washington, DC 20057, USA.
authors: Jennifer A
authors: JA
authors: Swift
keywords: Hirshfeld surface analysis; crystal structure; diphenylurea; fluorine; hydrogen-bonding motifs; polymorph