1,2,4-triazolo[4,3-a]pyrimidines: a new kind of ligands. Structure of the silver(I) dimer with the 7-oxo derivative

The crystal structure of the dinuclear compound [Ag2L2(NO3)2] · 2H2O is described, where L = 7,8-dihydro-7-oxo-1,2,4-triazolo[4,3-a]pyrimidine. L acts as a bridging ligand through its nitrogen atoms in the triazole ring. This is the first coordination compound described for a 1,2,4-triazolo[4,3-a]pyrimidine derivative.