Bis(7-amino-1,2,4-triazolo[1,5-a]pyrimidin-4-ium) bis(oxalato-[kappa]2O1,O2)cuprate(II) dihydrate Caballero Hernández, Ana Belén Castillo, Óscar Rodríguez Diéguez, Antonio Salas Peregrín, Juan Manuel Single-crystal X-ray study Metal-organic compounds The structure of the title ionic compound, (C5H6N5)2[Cu(C2O4)2]·2H2O, consists of a centrosymmetric copper(II) oxalate dianion, two monoprotonated molecules of the adenine analog 7-amino-1,2,4-triazolo[1,5-a]pyrimidine (7atp) and two water molecules of crystallization. The CuII ion, located on an inversion center, exhibits a sligthly distorted square-planar coordination geometry, in which two oxalate anions bind in a bidentate fashion. The triazolopyrimidine ligand is protonated at the N atom in position 4, instead of its most basic N atom in position 3. This fact may be explained by the network stability, which is provided through the formation of a two-dimensional wave-like network parallel to (50\overline1) by N-H...O, O-H...N and O-H...O hydrogen bonds. These nets are further connected via C-H...O interactions. 2014-05-26T08:20:51Z 2014-05-26T08:20:51Z 2011 info:eu-repo/semantics/article Caballero, A.B.; et al. Bis(7-amino-1,2,4-triazolo[1,5-a]pyrimidin-4-ium) bis(oxalato-[kappa]2O1,O2)cuprate(II) dihydrate. Acta Crsystallographica Section E, 67(11): m1531-m1532 (2011). [http://hdl.handle.net/10481/31912] 1600-5368 http://hdl.handle.net/10481/31912 10.1107/S1600536811040724 eng info:eu-repo/semantics/openAccess International Union of Crystallography