Solvent-dependent 2D-coordination polymers of Cu(I) containing a bridging triazolopyrimidine ligand

► First Cu(I) complexes with nucleobase-analog 1,2,4-triazolo[1,5-a]pyrimidine. ► Rare bridging action of 1,2,4-triazolo[1,5-a]pyrimidine between Cu(I) atoms. ► Crystal solvent-dependent bridging mode of 1,2,4-triazolo[1,5-a]pyrimidine.