title: A monoclinic polymorph of 4-(2H-1,3-benzodioxol-5-yl)-1-(4-methyl-phen-yl)-1H-pyrazol-5-amine.
abstract: The title compound, C17H15N3O2, is a monoclinic polymorph (P21/c with Z' = 1) of the previously reported triclinic (P-1 with Z' = 2) form [Gajera et al. (2013 ▸). Acta Cryst. E69, o736-o737]. The mol-ecule in the monoclinic polymorph features a central pyrazolyl ring with an N-bound p-tolyl group and a C-bound 1,3-benzodioxolyl fused-ring system on either side of the C atom bearing the amino group. The dihedral angles between the central ring and the N- and C-bound rings are 50.06 (5) and 27.27 (5)°, respectively. The angle between the pendent rings is 77.31 (4)°, indicating the mol-ecule has a twisted conformation. The five-membered dioxolyl ring has an envelope conformation with the methyl-ene C atom being the flap. The relative disposition of the amino and dioxolyl substituents is syn. One of the independent mol-ecules in the triclinic form has a similar syn disposition but the other has an anti arrangement of these substituents. In the crystal structure of the monoclinic form, mol-ecules assemble into supra-molecular helical chains via amino-pyrazolyl N-H⋯N hydrogen bonds. These are linked into layers via C-H⋯π inter-actions, and layers stack along the a axis with no specific inter-actions between them.
authors.affiliation: Department of Physics, Bhavan's Sheth R. A. College of Science, Ahmedabad, Gujarat 380 001, India.
authors.forename: Mukesh M
authors.initials: MM
authors.lastname: Jotani
authors.affiliation: P. S. Science and H. D. Patel Arts College, S. V. Campus, Kadi, Gujarat 382 715, India.
authors.forename: Nilesh N
authors.initials: NN
authors.lastname: Gajera
authors.affiliation: P. S. Science and H. D. Patel Arts College, S. V. Campus, Kadi, Gujarat 382 715, India.
authors.forename: Mukesh C
authors.initials: MC
authors.lastname: Patel
authors.affiliation: Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, People's Republic of China.
authors.forename: Herman H Y
authors.initials: HH
authors.lastname: Sung
authors.affiliation: Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia ; Centre for Chemical Crystallography and Faculty of Science and Technology, Sunway University, 47500 Bandar Sunway, Selangor Darul Ehsan, Malaysia.
authors.forename: Edward R T
authors.initials: ER
authors.lastname: Tiekink
keywords: Hirshfeld surface; amine; conformation; crystal structure; polymorph