Di-2-pyridyl ketone oxime in copper chemistry: di-, tri-, penta- and hexanuclear complexes

The use of di-2-pyridyl ketone oxime (Hpko)/X- "blends" (X- = OH-, Cl-, ClO4-) in copper chemistry has yielded neutral binuclear and cationic trinuclear, pentanuclear or hexanuclear complexes. Various synthetic procedures have led to the synthesis of compounds Cu5(pko)7].ClO4]3.2CH3OH.2H2O (1), Cu3(pko)3(OH)(Cl)]2Ph4B]2.4DMF.2H2O (2), Cu2(pko)4] (3), {Cu6(pko)6ClO4(CH3CN)6]Cu6(pko)6(ClO4)3(CH3CN)4]}.8ClO4.14CH3CN.H2O (4). The structures of the complexes have been determined by single-crystal X-ray crystallography.