AbstractCopper salts of low pH (1.8–2.5) combine with phenyl‐2‐pyridyl ketone to form a ketone complex [(Py–CO–C6H5)2Cu]2+. An electrically uncharged complex is obtained at pH>9 [(Py–C(OH)(C6H5)O−)2Cu]0, liberating two protons from two molecules of the ligand. The stability constant of this complex is β = 16.05. By mixing the copper salts (except the halide) containing this ligand with ethylenediamine, a charged triple complex is obtained at pH9.5, an uncharged triple complex is obtained: {[(Py–C(OH)(C6H5)O−)2Cu}2· NH2C2H4NH2}0. The copper halide salts produce only an uncharged triple complex; the halide ions are coordinated with the copper atoms. All of these complexes in their solid state, are bi‐ or polynuclear. As a result, they
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