A unique 2:1 cocrystal of mixed Cu(I)/Cu(II) complexes [Cu-1(H(2)CPz(2))(MeCN)(2)](ClO4) (1) and [Cu-11(H(2)CPz(2))(2)(ClO4)(2)] (4), a novel ferromagnetic ClO4--bridged bis(mu-hydroxo)dicopper(II) complex, [CU2(H(2)CPz(2))(2)(OH)(2)(ClO4)](ClO4)(CH3-CN)(