Syntheses, redox behavior, and magnetic and spectroscopic properties of copper(II)copper(II)copper(II), copper(II)nickel(II)copper(II), and copper(II)palladium(II)copper(II) species. Crystal structure of [L2Cu2Cu(dmg)2Br]ClO4.cntdot.CH3OH (L = 1,4,7-trimethyl-1,4,7-triazacyclononane; dmg = dimethylg