“…With Cd(II) formation of Cd(Hpz)"2+ complexes was observed for = 1, 2, and 3 but not 4, even at high pyrazole concentrations. 47 In a comparative study of pyrazole and 3,5-dimethylpyrazole complexes with Cd(II) again only three complex species were detected for each.48 •49 Complex formation between Pb(II) and pyrazole and between Ni(II) and Co(II) and 3,5-dimethyl-pyrazole was studied. Stability constants were determined for the reversibly reduced Pb complexes and the irreversibly reduced complexes of Ni, as well as complexes of the substituted ligand.50 With Zn(II) and pyrazole three weakly complexed species were detected while Cu(II) formed primarily the biscoordinated species.…”