STRUCTURE OF DIAQUATRIS(5,7-DIMETHYL[1,2,4]-TRIAZOLO [1,5-A]PYRIMIDINE-N-3)COPPER(II) PERCHLORATE DIHYDRATE

The synthesis and crystal structure of the title compound obtained by reaction of copper perchlorate with 5,7-dimethyl[1,2,4]triazolo[1,5-al pha]pyrimidine (dmtp) are reported. The structure consists of [Cu(dmtp )(3)(H2O)(2)](2+) coordination cations, ClO4- anions and interstitial water molecules. The Cu atom is coordinated by three N(3) atoms of tri azolopyrimidine ligands [Cu-N = 1.985 (5), 1.993 (4), 2.024 (4) Angstr om] and two aqueous O atoms [Cu-O = 1.979 (4), 2.245 (4) Angstrom]. Th e Cu polyhedron is a trigonal bipyramid. This compound is the first dm tp complex with a ClO4 anion and the first mononuclear complex involvi ng three dmtp ligands, and whose crystal structure has been solved by X-ray diffraction.