Synthesis, electrochemistry, and magnetic properties of binuclear cobalt complexes containing the Co2(µ-X)(µ-carboxylato)2n+core (X = OH, Cl, or Br; n= 1–3). The crystal structures of [Co2II(µ-ClH2CCO2)2(µ-Cl)L2]PF6and [CoIICoIII(µ-MeCO2)2(µ-OH)L2][ClO4]2·0.5H2O (L =N,N′,N″-trimethyl-1,4,7-triazacyc