Publication Details (including relevant citation information):
Chemical Communications (Cambridge, United Kingdom) (2010), 46(1), 136-138. Chiarella, Gina M.; Melgarejo, Doris Y.; Rozanski, Alex; Hempte, Pierre; Perez, Lisa M.; Reber, Christian; Fackler, John P., Jr.
The reaction of CuCl with the neutral guanidine Hhpp ligand (1,3,4,6,7,8-hexahydropyrimido[1,2-a]pyrimidine) yields two cryst. polymorphs of the neutral dimer, bis(1,3,4,6,7,8-hexahydropyrimido[1,2-a]pyrimidine)dichloro-di-copper(I), which were characterized by x-ray crystallog. and 1H NMR and Raman spectroscopy. They have the shortest distance known for a bridging unsupported copper(I)-copper(I) interaction.