Transition metal complexes of the tridentate NSN-donor ligand 5-(3,5-dimethylpyrazol-1-yl)-3-thia-1-pentaneamine. Crystal structure of [Cu(dptpa)(NO3)2]

The tridentate NSN-donor ligand 5-(3,5-dimethylpyrazol-1-yl)-3-thia-1-pentaneamine (dptpa) renders coordination compounds with halide and nitrate salts of divalent cobalt, nickel, copper, and zinc with general formula [M(dptpa)X2]. The single-crystal X-ray structure of [Cu(dptpa)(NO3)2] shows the copper ion to be in a distorted square-pyramidal N2SO2 environment of the tridentate ligand and the two monodentate binding nitrate ions. One of the nitrate anions is coordinated as semi-didentate, and as such the copper ion may be regarded to be in a quite distorted octahedral environment.