Dias, S. I. G. Heirtzler, Fenton Bark, Thomas Labat, Gael Neels, Antonia 2004-02-21 The zinc(II) complexes 1aZnCl₂ and 1bZnCl₂ (1a: 2-(6',2''-bipyrid-2'-yl)-3-(2- pyridyl)pyrazine; 1b: 2-(6',2'-bipyrid-2'-yl)-5,6-dinitrilo-3-(2-pyridyl)pyrazine) were prepared by treatment of the ligands with ZnCl₂. The structures of both were investigated by X-ray crystallography and 1H NMR spectroscopy. Both complexes display proton deshielding phenomena that are attributed to a twisted solution-state molecular conformation. In the solid state, 1aZnCl₂ exhibits a high degree of torsion about the axis through the uncomplexed pyridine ring and the pendant chlorine atoms. The solid-state structure and solution-state self-associative behavior of 1bZnCl₂ are indicative of a partial self-assembly motif. application/pdf https://folia.unifr.ch/global/documents/299837 https://folia.unifr.ch/documents/299837/files/1_bark_hzc.pdf eng info:eu-repo/semantics/altIdentifier/doi/10.1016/j.poly.2003.12.013 info:eu-repo/semantics/openAccess License undefined Polyhedron. - 2004, vol. 23, no. 6, p. 1011-1017 pyrazine pyridine X-ray NMR stacking twist info:eu-repo/classification/udc/54 Helical zinc complexes of pyrazine–pyridine hybrids http://purl.org/coar/resource_type/c_6501