Gardon, M.Schonleber, A.Chapuis, G.Hostettler, M.Bonin, M.2006-03-072006-03-072006-03-07200110.1107/S0108270101007028https://infoscience.epfl.ch/handle/20.500.14299/227333The 1,10-decanedioic acid-1,3,5,7-tetraazatricyclo[3.3.1.1(3,7)]decane (1/1) system, C10H18O4.C6H12N4, 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.text::journal::journal article::research article