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Abstract  Two newly synthesized coordination compounds copper(II) bromide with the ligand 7-isobutyl-5-methyl[1,2,4]triazolo[1,5-a]pyrimidine (abbreviated as ibmtp) are presented, together with their 3D crystal structure and spectroscopic and magnetic properties. The compounds are CuBr2(ibmtp)2 (1) (red crystals) and [CuBr(ibmtp)4]Br(H2O)3 (2) (blue crystals). In (1) the Cu(ii) ion is present in a distorted tetrahedral environment, while in (2) the Cu(ii) ion has a square pyramidal geometry. These crystal structures are also the first ones reported with the ligand ibmtp.     Graphical Abstract  Coordination compounds CuBr2(ibmtp)2 (red) and [CuBr(ibmtp)4]Br(H2O)3 (blue), with ibmtp = 7-isobutyl-5-methyl[1,2,4]triazolo[1,5-a]pyrimidine are presented. The Cu(II) is present in distorted tetrahedral, and square pyramidal geometries, respectively, and binds at N3.

journal of chemical crystallography

Red and Blue Compounds Formed from Copper(II) Bromide and the Ligand 7-Isobutyl-5-methyl-[1,2,4]triazolo[1,5-a]pyrimidine: Synthesis, Spectroscopy and Single-Crystal Structures