title: Crystal structure of 3-[4-(pyrimidin-2-yl)piperazin-1-ium-1-yl]butano-ate.
abstract: The title compound, C12H18N4O2, crystallizes in the zwitterionic form with protonation at the N atom of the piperazine ring bearing the carboxylate group. The piperazine ring adopts a slightly distorted chair conformation. In the crystal, N-H⋯O hydrogen bonds are observed, forming chains along [010]. The packing is consolidated by C-H⋯O inter-actions, which generate a three-dimensional network.
authors.affiliation: Department of Studies in Chemistry, University of Mysore, Manasagangotri, Mysore 570 006, India.
authors.forename: Thammarse S
authors.initials: TS
authors.lastname: Yamuna
authors.affiliation: Department of Chemistry, Keene State College, 229 Main Street, Keene, NH 03435-2001, USA.
authors.forename: Jerry P
authors.initials: JP
authors.lastname: Jasinski
authors.affiliation: Department of Studies in Chemistry, University of Mysore, Manasagangotri, Mysore 570 006, India.
authors.forename: Manpreet
authors.initials: M
authors.lastname: Kaur
authors.affiliation: Department of Chemistry, Keene State College, 229 Main Street, Keene, NH 03435-2001, USA.
authors.forename: Brian J
authors.initials: BJ
authors.lastname: Anderson
authors.affiliation: Department of Studies in Chemistry, University of Mysore, Manasagangotri, Mysore 570 006, India.
authors.forename: H S
authors.initials: HS
authors.lastname: Yathirajan
keywords: 3-(piperazin-1-ium-1-yl)butano­ate; aza-Michael reactions; crystal structure; fused heterocyclic derivatives; zwitterionic form