title: The lock-in phase in the urotropine-sebacic acid system.
abstract: The 1,10-decanedioic acid-1,3,5,7-tetraazatricyclo[3.3.1.1(3,7)]decane (1/1) system, C(10)H(18)O(4).C(6)H(12)N(4), was studied at 215 (2) K. Its analysis provides important information with regard to the long-standing acid-carboxylate controversy in the urotropine-alkanedioic acid system. In the present structure, all the chain end-groups display a clear acid character. The asymmetric unit of this commensurate modulated phase contains two molecules of diacid as well as two molecules of urotropine. Furthermore, the chain packing suggests a possible order parameter for the lock-in transition.
authors.affiliation: Institut de Cristallographie, Université de Lausanne, BSP Dorigny, CH-1015 Lausanne, Switzerland.
authors.forename: M
authors.initials: M
authors.lastname: Gardon
authors.forename: A
authors.initials: A
authors.lastname: Schönleber
authors.forename: G
authors.initials: G
authors.lastname: Chapuis
authors.forename: M
authors.initials: M
authors.lastname: Hostettler
authors.forename: M
authors.initials: M
authors.lastname: Bonin
mesh_terms: D018360:Crystallography, X-Ray; D003652:Decanoic Acids / Q000737:chemistry*; D003998:Dicarboxylic Acids; D006860:Hydrogen Bonding; D008709:Methenamine / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation
chemical_list: D003652:Decanoic Acids; D003998:Dicarboxylic Acids; C011107:sebacic acid; D008709:Methenamine