doi:10.1016/j.molstruc.2017.06.043engSusano, Maria A.Martín-Ramos, PabloMaria, Teresa M.R.Folkersma, StevenPereira, Laura C.J.Silva, Manuela RamosCo-crystal of suberic acid and 1,2-bis(4-pyridyl)ethane: A new case of packing polymorphismART-2017-100729The polymorphic behaviour of a co-crystal composed of neutral suberic acid and 1, 2-bis(4-pyridyl)ethane is reported. A multidisciplinary approach has been employed, using thermal analysis methods (differential scanning calorimetry and polarized light thermomicroscopy), spectroscopic methods (infrared spectroscopy) and X-ray single crystal and powder diffraction. Two new polymorphs, I and III; have been identified, and for one of them the crystal structure has been elucidated and compared to that of a known polymorph, form II, showing that the assembling of the molecules in chains via H-bonds is a common feature of both polymorphs. Polymorph II, obtained by crystallization from an aqueous or ethanol solution or by grinding, undergoes a solid-solid transition to polymorph I, which melts at 180.5 °C. Upon cooling from the melt, polymorph I is obtained, and a solid-solid transformation also occurs, to polymorph III''. Polymorph III was obtained serendipitously in an attempt to prepare a Nd(III) complex. The relative stability of the three polymorphic forms was established.2017http://zaguan.unizar.es/record/9735210.1016/j.molstruc.2017.06.043http://zaguan.unizar.es/record/97352oai:zaguan.unizar.es:97352JOURNAL OF MOLECULAR STRUCTURE 1147 (2017), 76-83by-nc-ndhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccess